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592acity="0.6"/> 593 <line x1="30" y1="18" x2="30" y2="38" stroke="#fff" stroke-width="2" opacity="0.6"/> 594 </svg> 595 </a> 596 </div> 597 598 <!-- Banner 9: Recursion --> 599 <div class="swiper-slide"> 600 <a href="#" class="banner banner-red"> 601 <h3>Recursion</h3> 602 <p>Master recursive patterns</p> 603 <span class="btn">Learn Now</span> 604 <svg class="illus" viewBox="0 0 130 110" fill="none"> 605 <circle cx="80" cy="55" r="38" stroke="#fff" stroke-width="2" fill="none" opacity="0.3"/> 606 <circle cx="80" cy="55" r="28" stroke="#fff" stroke-width="2" fill="none" opacity="0.4"/> 607 <circle cx="80" cy="55" r="18" stroke="#fff" stroke-width="2" fill="none" opacity="0.6"/> 608 <circle cx="80" cy="55" r="10" fill="#fff" opacity="0.8"/> 609 <text x="72" y="59" font-size="9" fill="#c62828" font-weight="700">f(n)</text> 610 <path d="M38 25 Q25 55 38 85" stroke="#fff" stroke-width="2" fill="none" opacity="0.5"/> 611 <path d="M38 25 L43 30 L33 30 Z" fill="#fff" opacity="0.5"/> 612 </svg> 613 </a> 614 </div> 615 </div> 616 </div> 617 618 <!-- Round Navigation Buttons --> 619 <button class="nav-btn nav-prev"> 620 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><path d="M15 18l-6-6 6-6"/></svg> 621 </button> 622 <button class="nav-btn nav-next"> 623 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><path d="M9 18l6-6-6-6"/></svg> 624 </button> 625 </div> 626 627 <!-- Topic Cards --> 628<div class="cards-container"> 629 <div class="cards-grid" id="cardsGrid"> 630 631 <a href="/topic/array" class="card"> 632 <div class="card-icon ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="7" height="7" rx="1"></rect><rect x="14" y="3" width="7" height="7" rx="1"></rect><rect x="3" y="14" width="7" height="7" rx="1"></rect><rect x="14" y="14" width="7" height="7" rx="1"></rect></svg></div> 633 <div><h4>Array</h4><div class="count">1,947 Problems</div></div> 634 </a> 635 <a href="/topic/string" class="card"> 636 <div class="card-icon ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 7V4h16v3"></path><path d="M9 20h6"></path><path d="M12 4v16"></path></svg></div> 637 <div><h4>String</h4><div class="count">803 Problems</div></div> 638 </a> 639 <a href="/topic/hash-table" class="card"> 640 <div class="card-icon ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><line x1="4" y1="9" x2="20" y2="9"></line><line x1="4" y1="15" x2="20" y2="15"></line><line x1="10" y1="3" x2="8" y2="21"></line><line x1="16" y1="3" x2="14" y2="21"></line></svg></div> 641 <div><h4>Hash Table</h4><div class="count">719 Problems</div></div> 642 </a> 643 <a href="/topic/dynamic-programming" class="card"> 644 <div class="card-icon ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="18" height="18" rx="2"></rect><path d="M3 9h18"></path><path d="M3 15h18"></path><path d="M9 3v18"></path><path d="M15 3v18"></path></svg></div> 645 <div><h4>Dynamic Programming</h4><div class="count">602 Problems</div></div> 646 </a> 647 <a href="/topic/sorting" class="card"> 648 <div class="card-icon ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M3 6h18"></path><path d="M6 12h12"></path><path d="M9 18h6"></path></svg></div> 649 <div><h4>Sorting</h4><div class="count">464 Problems</div></div> 650 </a> 651 <a href="/topic/greedy" class="card">
652 <div class="card-icon ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M12 2L2 7l10 5 10-5-10-5z"></path><path d="M2 17l10 5 10-5"></path><path d="M2 12l10 5 10-5"></path></svg></div> 653 <div><h4>Greedy</h4><div class="count">420 Problems</div></div> 654 </a> 655 <a href="/topic/depth-first-search" class="card"> 656 <div class="card-icon ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="5" r="3"></circle><line x1="12" y1="8" x2="12" y2="12"></line><circle cx="6" cy="17" r="3"></circle><circle cx="18" cy="17" r="3"></circle><line x1="12" y1="12" x2="6" y2="14"></line><line x1="12" y1="12" x2="18" y2="14"></line></svg></div> 657 <div><h4>Depth-First Search</h4><div class="count">325 Problems</div></div> 658 </a> 659 <div class="card see-all-btn" id="seeAllBtn"> 660 <div class="card-icon ic8"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="12" r="9"></circle><path d="M12 8v8"></path><path d="M8 12h8"></path></svg></div> 661 <div><h4>See All Topics</h4><div class="count">73 Categories</div></div> 662 </div> 663 </div> 664 665 <!-- Expanded View --> 666 <div class="cards-expanded hidden" id="cardsExpanded"> 667 <div class="cards-scroll"> 668 <a href="/topic/array" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="7" height="7" rx="1"></rect><rect x="14" y="3" width="7" height="7" rx="1"></rect><rect x="3" y="14" width="7" height="7" rx="1"></rect><rect x="14" y="14" width="7" height="7" rx="1"></rect></svg></div><div><h4>Array</h4><span>1,947 Problems</span></div></a> 669 <a href="/topic/string" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 7V4h16v3"></path><path d="M9 20h6"></path><path d="M12 4v16"></path></svg></div><div><h4>String</h4><span>803 Problems</span></div></a> 670 <a href="/topic/hash-table" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><line x1="4" y1="9" x2="20" y2="9"></line><line x1="4" y1="15" x2="20" y2="15"></line><line x1="10" y1="3" x2="8" y2="21"></line><line x1="16" y1="3" x2="14" y2="21"></line></svg></div><div><h4>Hash Table</h4><span>719 Problems</span></div></a> 671 <a href="/topic/math" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M12 2L2 7l10 5 10-5z"></path><path d="M12 12l10-5"></path><path d="M12 12L2 7"></path><path d="M12 12v10"></path></svg></div><div><h4>Math</h4><span>596 Problems</span></div></a> 672 <a href="/topic/dynamic-programming" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="18" height="18" rx="2"></rect><path d="M3 9h18"></path><path d="M3 15h18"></path><path d="M9 3v18"></path><path d="M15 3v18"></path></svg></div><div><h4>Dynamic Programming</h4><span>602 Problems</span></div></a> 673 <a href="/topic/sorting" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M3 6h18"></path><path d="M6 12h12"></path><path d="M9 18h6"></path></svg></div><div><h4>Sorting</h4><span>464 Problems</span></div></a> 674 <a href="/topic/greedy" class="card-small"><div class="card-icon-sm ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M12 2L2 7l10 5 10-5-10-5z"></path><path d="M2 17l10 5 10-5"></path><path d="M2 12l10 5 10-5"></path></svg></div><div><h4>Greedy</h4><span>420 Problems</span></div></a> 675 <a href="/topic/depth-first-search" class="card-small"><div class="card-icon-sm ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="5" r="3"></circle><line x1="12" y1="8" x2="12" y2="12"></line><circle cx="6" cy="17" r="3"></circle><circle cx="18" cy="17" r="3"></circle><line x1="12" y1="12" x2="6" y2="14"></line><line x1="12" y1="12" x2="18" y2="14"></line></svg></div><div><h4>Depth-First Search</h4><span>325 Problems</span></div></a>
676 <a href="/topic/database" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><ellipse cx="12" cy="5" rx="9" ry="3"></ellipse><path d="M21 12c0 1.66-4 3-9 3s-9-1.34-9-3"></path><path d="M3 5v14c0 1.66 4 3 9 3s9-1.34 9-3V5"></path></svg></div><div><h4>Database</h4><span>324 Problems</span></div></a> 677 <a href="/topic/binary-search" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="11" cy="11" r="8"></circle><path d="M21 21l-4.35-4.35"></path></svg></div><div><h4>Binary Search</h4><span>309 Problems</span></div></a> 678 <a href="/topic/matrix" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="6" height="6"></rect><rect x="15" y="3" width="6" height="6"></rect><rect x="9" y="9" width="6" height="6"></rect><rect x="3" y="15" width="6" height="6"></rect><rect x="15" y="15" width="6" height="6"></rect></svg></div><div><h4>Matrix</h4><span>260 Problems</span></div></a> 679 <a href="/topic/tree" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="5" r="3"></circle><line x1="12" y1="8" x2="12" y2="12"></line><circle cx="6" cy="19" r="3"></circle><circle cx="18" cy="19" r="3"></circle><line x1="12" y1="12" x2="6" y2="16"></line><line x1="12" y1="12" x2="18" y2="16"></line></svg></div><div><h4>Tree</h4><span>252 Problems</span></div></a> 680 <a href="/topic/bit-manipulation" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M22 12h-4l-3 9L9 3l-3 9H2"></path></svg></div><div><h4>Bit Manipulation</h4><span>249 Problems</span></div></a> 681 <a href="/topic/breadth-first-search" class="card-small"><div class="card-icon-sm ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="12" r="3"></circle><circle cx="4" cy="12" r="2"></circle><circle cx="20" cy="12" r="2"></circle><circle cx="12" cy="4" r="2"></circle><circle cx="12" cy="20" r="2"></circle><line x1="12" y1="9" x2="12" y2="6"></line><line x1="12" y1="15" x2="12" y2="18"></line><line x1="9" y1="12" x2="6" y2="12"></line><line x1="15" y1="12" x2="18" y2="12"></line></svg></div><div><h4>Breadth-First Search</h4><span>243 Problems</span></div></a> 682 <a href="/topic/two-pointers" class="card-small"><div class="card-icon-sm ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M5 9l4 4-4 4"></path><path d="M19 9l-4 4 4 4"></path></svg></div><div><h4>Two Pointers</h4><span>223 Problems</span></div></a> 683 <a href="/topic/prefix-sum" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 12h16"></path><path d="M4 6h8"></path><path d="M4 18h12"></path></svg></div><div><h4>Prefix Sum</h4><span>208 Problems</span></div></a> 684 <a href="/topic/heap-(priority-queue).htm" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M12 2L2 7l10 5 10-5-10-5z"></path><path d="M2 12l10 5 10-5"></path></svg></div><div><h4>Heap (Priority Queue)</h4><span>196 Problems</span></div></a> 685 <a href="/topic/simulation" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="2" y="2" width="20" height="20" rx="2"></rect><path d="M12 6v12"></path><path d="M6 12h12"></path></svg></div><div><h4>Simulation</h4><span>185 Problems</span></div></a> 686 <a href="/topic/binary-tree" class="card-small"><div class="card-icon-sm ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="5" r="3"></circle><circle cx="6" cy="19" r="3"></circle><circle cx="18" cy="19" r="3"></circle><line x1="12" y1="8" x2="6" y2="16"></line><line x1="12" y1="8" x2="18" y2="16"></line></svg></div><div><h4>Binary Tree</h4><span>177 Problems</span></div></a> 687 <a href="/topic/stack" class="card-small"><div class="card-icon-sm ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="4" y="4" width="16" height="16" rx="2"></rect><path d="M4 10h16"></path><path d="M10 4v16"></path></svg></div><div><h4>Stack</h4><span>172 Problems</span></div></a> 688 <a href="/topic/graph" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="6" cy="6" r="3"></circle><circle cx="18" cy="6" r="3"></circle><circle cx="6" cy="18" r="3"></circle><circle cx="18" cy="18" r="3"></circle><line x1="9" y1="6" x2="15" y2="6"></line><line x1="6" y1="9" x2="6" y2="15"></line><line x1="18" y1="9" x2="18" y2="15"></line><line x1="9" y1="18" x2="15" y2="18"></line></svg></div><div><h4>Graph</h4><span>169 Problems</span></div></a> 689 <a href="/topic/counting" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M12 20V10"></path><path d="M18 20V4"></path><path d="M6 20v-4"></path></svg></div><div><h4>Counting</h4><span>166 Problems</span></div></a>
690 <a href="/topic/sliding-window" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="1" y="5" width="22" height="14" rx="2"></rect><rect x="5" y="8" width="6" height="8" rx="1" fill="currentColor" opacity="0.3"></rect></svg></div><div><h4>Sliding Window</h4><span>154 Problems</span></div></a> 691 <a href="/topic/design" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><path d="M12 6v6l4 2"></path></svg></div><div><h4>Design</h4><span>128 Problems</span></div></a> 692 <a href="/topic/enumeration" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M3 6h18"></path><path d="M3 12h18"></path><path d="M3 18h18"></path></svg></div><div><h4>Enumeration</h4><span>123 Problems</span></div></a> 693 <a href="/topic/backtracking" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M9 14l-4 4 4 4"></path><path d="M5 18h7a4 4 0 0 0 0-8h-1"></path></svg></div><div><h4>Backtracking</h4><span>109 Problems</span></div></a> 694 <a href="/topic/union-find" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="9" cy="9" r="5"></circle><circle cx="15" cy="15" r="5"></circle></svg></div><div><h4>Union Find</h4><span>89 Problems</span></div></a> 695 <a href="/topic/linked-list" class="card-small"><div class="card-icon-sm ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="6" cy="12" r="3"></circle><circle cx="18" cy="12" r="3"></circle><line x1="9" y1="12" x2="15" y2="12"></line></svg></div><div><h4>Linked List</h4><span>82 Problems</span></div></a> 696 <a href="/topic/number-theory" class="card-small"><div class="card-icon-sm ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 19l8-14 8 14"></path><circle cx="12" cy="9" r="2"></circle></svg></div><div><h4>Number Theory</h4><span>76 Problems</span></div></a> 697 <a href="/topic/ordered-set" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="18" height="18" rx="2"></rect><path d="M8 12h8"></path></svg></div><div><h4>Ordered Set</h4><span>72 Problems</span></div></a> 698 <a href="/topic/monotonic-stack" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="4" y="4" width="16" height="4"></rect><rect x="4" y="10" width="16" height="4"></rect><rect x="4" y="16" width="16" height="4"></rect></svg></div><div><h4>Monotonic Stack</h4><span>68 Problems</span></div></a> 699 <a href="/topic/segment-tree" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M3 3v18h18"></path><path d="M7 16l4-8 4 5 5-10"></path></svg></div><div><h4>Segment Tree</h4><span>65 Problems</span></div></a> 700 <a href="/topic/javascript" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="18" height="18" rx="2"></rect><path d="M12 8v8"></path><path d="M8 12h8"></path></svg></div><div><h4>JavaScript</h4><span>64 Problems</span></div></a> 701 <a href="/topic/trie" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="5" r="3"></circle><path d="M12 8v4"></path><path d="M8 14h8"></path><path d="M6 18h4"></path><path d="M14 18h4"></path></svg></div><div><h4>Trie</h4><span>59 Problems</span></div></a> 702 <a href="/topic/combinatorics" class="card-small"><div class="card-icon-sm ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M12 3l9 4.5v9L12 21l-9-4.5v-9L12 3z"></path></svg></div><div><h4>Combinatorics</h4><span>55 Problems</span></div></a> 703 <a href="/topic/bitmask" class="card-small"><div class="card-icon-sm ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="8" height="8"></rect><rect x="13" y="3" width="8" height="8"></rect><rect x="3" y="13" width="8" height="8"></rect><rect x="13" y="13" width="8" height="8"></rect></svg></div><div><h4>Bitmask</h4><span>54 Problems</span></div></a> 704 <a href="/topic/recursion" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 12a8 8 0 0 1 16 0"></path><path d="M12 12v8"></path><circle cx="12" cy="12" r="2"></circle></svg></div><div><h4>Recursion</h4><span>50 Problems</span></div></a> 705 <a href="/topic/divide-and-conquer" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="18" height="6" rx="1"></rect><rect x="3" y="15" width="8" height="6" rx="1"></rect><rect x="13" y="15" width="8" height="6" rx="1"></rect></svg></div><div><h4>Divide and Conquer</h4><span>50 Problems</span></div></a> 706 <a href="/topic/queue" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="6" width="18" height="12" rx="2"></rect><path d="M3 10h18"></path></svg></div><div><h4>Queue</h4><span>50 Problems</span></div></a> 707 <a href="/topic/memoization" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="4" y="4" width="16" height="16" rx="2"></rect><path d="M4 12h16"></path><path d="M12 4v16"></path></svg></div><div><h4>Memoization</h4><span>43 Problems</span></div></a> 708 <a href="/topic/binary-indexed-tree" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M3 3v18h18"></path><rect x="7" y="10" width="3" height="8"></rect><rect x="12" y="6" width="3" height="12"></rect><rect x="17" y="13" width="3" height="5"></rect></svg></div><div><h4>Binary Indexed Tree</h4><span>42 Problems</span></div></a> 709 <a href="/topic/geometry" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><polygon points="12,6 14,10 18,10 15,13 16,17 12,15 8,17 9,13 6,10 10,10"></polygon></svg></div><div><h4>Geometry</h4><span>42 Problems</span></div></a> 710 <a href="/topic/binary-search-tree" class="card-small"><div class="card-icon-sm ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="5" r="3"></circle><circle cx="6" cy="12" r="2"></circle><circle cx="18" cy="12" r="2"></circle><circle cx="4" cy="19" r="2"></circle><circle cx="12" cy="19" r="2"></circle><circle cx="20" cy="19" r="2"></circle></svg></div><div><h4>Binary Search Tree</h4><span>40 Problems</span></div></a> 711 <a href="/topic/hash-function" class="card-small"><div class="card-icon-sm ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><path d="M12 6v6"></path><circle cx="12" cy="16" r="1"></circle></svg></div><div><h4>Hash Function</h4><span>39 Problems</span></div></a> 712 <a href="/topic/string-matching" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 7h16"></path><path d="M4 12h10"></path><path d="M4 17h14"></path></svg></div><div><h4>String Matching</h4><span>37 Problems</span></div></a> 713 <a href="/topic/topological-sort" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M3 3l7 9-7 9"></path><path d="M21 3l-7 9 7 9"></path></svg></div><div><h4>Topological Sort</h4><span>36 Problems</span></div></a> 714 <a href="/topic/shortest-path" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="5" cy="12" r="3"></circle><circle cx="19" cy="12" r="3"></circle><path d="M8 12h8" stroke-dasharray="2 2"></path></svg></div><div><h4>Shortest Path</h4><span>35 Problems</span></div></a> 715 <a href="/topic/rolling-hash" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><path d="M12 6v6l3 3"></path></svg></div><div><h4>Rolling Hash</h4><span>30 Problems</span></div></a> 716 <a href="/topic/game-theory" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="2" y="6" width="20" height="12" rx="2"></rect><circle cx="8" cy="12" r="2"></circle><circle cx="16" cy="12" r="2"></circle></svg></div><div><h4>Game Theory</h4><span>28 Problems</span></div></a> 717 <a href="/topic/interactive" class="card-small"><div class="card-icon-sm ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M12 3v18"></path><path d="M3 12h18"></path><circle cx="12" cy="12" r="3"></circle></svg></div><div><h4>Interactive</h4><span>23 Problems</span></div></a>
718 <a href="/topic/data-stream" class="card-small"><div class="card-icon-sm ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M2 12h2"></path><path d="M6 12h2"></path><path d="M10 12h2"></path><path d="M14 12h2"></path><path d="M18 12h2"></path><path d="M20 12h2"></path></svg></div><div><h4>Data Stream</h4><span>22 Problems</span></div></a> 719 <a href="/topic/monotonic-queue" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 14h4v6H4z"></path><path d="M10 10h4v10h-4z"></path><path d="M16 4h4v16h-4z"></path></svg></div><div><h4>Monotonic Queue</h4><span>20 Problems</span></div></a> 720 <a href="/topic/brainteaser" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><path d="M9 9h.01"></path><path d="M15 9h.01"></path><path d="M9 15c.5.5 1.5 1 3 1s2.5-.5 3-1"></path></svg></div><div><h4>Brainteaser</h4><span>19 Problems</span></div></a> 721 <a href="/topic/doubly-linked-list" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="6" cy="12" r="3"></circle><circle cx="12" cy="12" r="3"></circle><circle cx="18" cy="12" r="3"></circle><path d="M3 12h0"></path><path d="M21 12h0"></path></svg></div><div><h4>Doubly-Linked List</h4><span>14 Problems</span></div></a> 722 <a href="/topic/randomized" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 4l16 16"></path><circle cx="8" cy="8" r="3"></circle><circle cx="16" cy="16" r="3"></circle></svg></div><div><h4>Randomized</h4><span>12 Problems</span></div></a> 723 <a href="/topic/merge-sort" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 6h16"></path><path d="M4 10h8"></path><path d="M14 10h6"></path><path d="M4 14h4"></path><path d="M10 14h4"></path><path d="M16 14h4"></path><path d="M4 18h2"></path><path d="M8 18h2"></path><path d="M12 18h2"></path><path d="M16 18h2"></path><path d="M20 18h2"></path></svg></div><div><h4>Merge Sort</h4><span>12 Problems</span></div></a> 724 <a href="/topic/counting-sort" class="card-small"><div class="card-icon-sm ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M3 3l18 18"></path><rect x="3" y="8" width="8" height="8"></rect><rect x="13" y="8" width="8" height="8"></rect></svg></div><div><h4>Counting Sort</h4><span>11 Problems</span></div></a> 725 <a href="/topic/iterator" class="card-small"><div class="card-icon-sm ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M5 9l4-4 4 4"></path><path d="M9 5v14"></path><path d="M15 15l4 4 4-4"></path><path d="M19 19V5"></path></svg></div><div><h4>Iterator</h4><span>9 Problems</span></div></a> 726 <a href="/topic/concurrency" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 4v16"></path><path d="M20 4v16"></path><path d="M4 12h16"></path></svg></div><div><h4>Concurrency</h4><span>9 Problems</span></div></a> 727 <a href="/topic/line-sweep" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 6l16 12"></path><path d="M4 18L20 6"></path></svg></div><div><h4>Line Sweep</h4><span>8 Problems</span></div></a> 728 <a href="/topic/probability-and-statistics" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M3 3v18h18"></path><circle cx="9" cy="9" r="2"></circle><circle cx="15" cy="15" r="2"></circle><circle cx="18" cy="6" r="2"></circle></svg></div><div><h4>Probability & Statistics</h4><span>7 Problems</span></div></a> 729 <a href="/topic/suffix-array" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 6h16"></path><path d="M4 18h16"></path><path d="M12 6v12"></path></svg></div><div><h4>Suffix Array</h4><span>7 Problems</span></div></a> 730 <a href="/topic/quickselect" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M5 12h14"></path><path d="M12 5v14"></path></svg></div><div><h4>Quickselect</h4><span>7 Problems</span></div></a> 731 <a href="/topic/minimum-spanning-tree" class="card-small"><div class="card-icon-sm ic6"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="6" cy="6" r="3"></circle><circle cx="18" cy="6" r="3"></circle><circle cx="12" cy="18" r="3"></circle><line x1="6" y1="9" x2="12" y2="15"></line><line x1="18" y1="9" x2="12" y2="15"></line></svg></div><div><h4>Minimum Spanning Tree</h4><span>6 Problems</span></div></a> 732 <a href="/topic/bucket-sort" class="card-small"><div class="card-icon-sm ic7"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M4 16V8a4 4 0 0 1 4-4h8a4 4 0 0 1 4 4v8a4 4 0 0 1-4 4H8a4 4 0 0 1-4-4z"></path></svg></div><div><h4>Bucket Sort</h4><span>6 Problems</span></div></a> 733 <a href="/topic/pandas" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="18" height="18" rx="2"></rect><path d="M3 9h18"></path><path d="M9 3v18"></path></svg></div><div><h4>Pandas</h4><span>4 Problems</span></div></a> 734 <a href="/topic/reservoir-sampling" class="card-small"><div class="card-icon-sm ic2"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><rect x="3" y="3" width="18" height="18" rx="2"></rect><circle cx="12" cy="12" r="4"></circle></svg></div><div><h4>Reservoir Sampling</h4><span>4 Problems</span></div></a> 735 <a href="/topic/shell" class="card-small"><div class="card-icon-sm ic1"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M12 2L2 7l10 5 10-5-10-5z"></path></svg></div><div><h4>Shell</h4><span>4 Problems</span></div></a> 736 <a href="/topic/eulerian-circuit" class="card-small"><div class="card-icon-sm ic4"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="12" r="8"></circle><path d="M12 4a8 8 0 0 1 0 16"></path></svg></div><div><h4>Eulerian Circuit</h4><span>3 Problems</span></div></a> 737 <a href="/topic/strongly-connected-component" class="card-small"><div class="card-icon-sm ic3"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><circle cx="12" cy="12" r="10"></circle><path d="M12 8v8"></path></svg></div><div><h4>Strongly Connected Component</h4><span>3 Problems</span></div></a> 738 <a href="/topic/radix-sort" class="card-small"><div class="card-icon-sm ic5"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M3 12h4l2-8 4 16 2-8h6"></path></svg></div><div><h4>Radix Sort</h4><span>3 Problems</span></div></a> 739 <!-- Collapse Button --> 740 <div class="card-small collapse-btn" id="collapseBtn"> 741 <div class="card-icon-sm ic8"><svg viewBox="0 0 24 24" fill="none" stroke-width="2"><path d="M18 15l-6-6-6 6"></path></svg></div> 742 <div><h4>Collapse</h4><span>Show Less</span></div> 743 </div> 744 </div> 745 </div> 746</div> 747 </div> 748 </div> 749 750 <!-- Code Practice Section --> 751 <section class="container practice-section"> 752 <div class="practice-header" id="topicProblemsSection"> 753 <div class="practice-title-wrapper"> 754 <div> 755 <h2 class="section-title"> 756 Depth-First Search <span>Coding Problems</span> 757 <!-- Cute Animated Robot --> 758 <div class="ai-robot"> 759 <div class="robot-antenna"></div> 760 <div class="robot-ear left"></div> 761 <div class="robot-ear right"></div> 762 <div class="robot-head"> 763 <div class="robot-eye left"></div> 764 <div class="robot-eye right"></div> 765 <div class="robot-mouth"></div> 766 </div> 767 </div> 768 </h2> 769 <p class="section-subtitle ai-subtitle"><span class="ai-sparkle"><i class="fa-solid fa-sparkles"></i></span> Practice problems frequently asked at Depth-First Search <span class="ai-divider">â¢</span> <strong>0</strong> problems | <strong>0</strong> Easy | <strong>0</strong> Medium | <strong>0</strong> Hard</p> 770 </div> 771 <!-- Navigation Buttons on right side --> 772 <div class="practice-header-nav"> 773 <button class="nav-btn practice-nav-prev"> 774 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><path d="M15 18l-6-6 6-6"/></svg> 775 </button> 776 <button class="nav-btn practice-nav-next"> 777 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><path d="M9 18l6-6-6-6"/></svg> 778 </button> 779 </div> 780 </div> 781 </div> 782 783 <!-- Company Stats Slider --> 784<div class="practice-stats-slider-wrap"> 785 <div class="swiper practice-stats-slider"> 786 <div class="swiper-wrapper"> 787 <div class="swiper-slide"> 788 <a href="/company/google" class="practice-stat-card"> 789 <div class="practice-stat-icon company-google"><i class="fa-brands fa-google"></i></div> 790 <div class="practice-stat-info"><span class="practice-stat-value">3407</span><span class="practice-stat-label">Google</span></div> 791 </a> 792 </div> 793 <div class="swiper-slide"> 794 <a href="/company/amazon" class="practice-stat-card"> 795 <div class="practice-stat-icon company-amazon"><i class="fa-brands fa-amazon"></i></div> 796 <div class="practice-stat-info"><span class="practice-stat-value">3399</span><span class="practice-stat-label">Amazon</span></div> 797 </a> 798 </div> 799 <div class="swiper-slide"> 800 <a href="/company/microsoft" class="practice-stat-card"> 801 <div class="practice-stat-icon company-microsoft"><i class="fa-brands fa-microsoft"></i></div> 802 <div class="practice-stat-info"><span class="practice-stat-value">3344</span><span class="practice-stat-label">Microsoft</span></div> 803 </a> 804 </div> 805 <div class="swiper-slide"> 806 <a href="/company/meta" class="practice-stat-card"> 807 <div class="practice-stat-icon company-meta"><i class="fa-brands fa-meta"></i></div> 808 <div class="practice-stat-info"><span class="practice-stat-value">2900</span><span class="practice-stat-label">Meta</span></div> 809 </a> 810 </div> 811 <div class="swiper-slide"> 812 <a href="/company/apple" class="practice-stat-card"> 813 <div class="practice-stat-icon company-apple"><i class="fa-brands fa-apple"></i></div> 814 <div class="practice-stat-info"><span class="practice-stat-value">571</span><span class="practice-stat-label">
814Apple</span></div> 815 </a> 816 </div> 817 <div class="swiper-slide"> 818 <a href="/company/facebook" class="practice-stat-card"> 819 <div class="practice-stat-icon company-meta"><i class="fa-brands fa-facebook-f"></i></div> 820 <div class="practice-stat-info"><span class="practice-stat-value">275</span><span class="practice-stat-label">Facebook</span></div> 821 </a> 822 </div> 823 <div class="swiper-slide"> 824 <a href="/company/netflix" class="practice-stat-card"> 825 <div class="practice-stat-icon company-netflix"><i class="fa-solid fa-n"></i></div> 826 <div class="practice-stat-info"><span class="practice-stat-value">51</span><span class="practice-stat-label">Netflix</span></div> 827 </a> 828 </div> 829 <div class="swiper-slide"> 830 <a href="/company/uber" class="practice-stat-card"> 831 <div class="practice-stat-icon company-uber"><i class="fa-brands fa-uber"></i></div> 832 <div class="practice-stat-info"><span class="practice-stat-value">31</span><span class="practice-stat-label">Uber</span></div> 833 </a> 834 </div> 835 <div class="swiper-slide"> 836 <a href="/company/linkedin" class="practice-stat-card"> 837 <div class="practice-stat-icon company-linkedin"><i class="fa-brands fa-linkedin-in"></i></div> 838 <div class="practice-stat-info"><span class="practice-stat-value">27</span><span class="practice-stat-label">LinkedIn</span></div> 839 </a> 840 </div> 841 <div class="swiper-slide"> 842 <a href="/company/twitter" class="practice-stat-card"> 843 <div class="practice-stat-icon company-twitter"><i class="fa-brands fa-x-twitter"></i></div> 844 <div class="practice-stat-info"><span class="practice-stat-value">17</span><span class="practice-stat-label">Twitter</span></div> 845 </a> 846 </div> 847 <div class="swiper-slide"> 848 <a href="/company/spotify" class="practice-stat-card"> 849 <div class="practice-stat-icon company-spotify"><i class="fa-brands fa-spotify"></i></div> 850 <div class="practice-stat-info"><span class="practice-stat-value">15</span><span class="practice-stat-label">Spotify</span></div> 851 </a> 852 </div> 853 <div class="swiper-slide"> 854 <a href="/company/bloomberg" class="practice-stat-card"> 855 <div class="practice-stat-icon company-bloomberg"><i class="fa-solid fa-chart-line"></i></div> 856 <div class="practice-stat-info"><span class="practice-stat-value">14</span><span class="practice-stat-label">Bloomberg</span></div> 857 </a> 858 </div> 859 <div class="swiper-slide"> 860 <a href="/company/adobe" class="practice-stat-card"> 861 <div class="practice-stat-icon company-adobe"><i class="fa-solid fa-a"></i></div> 862 <div class="practice-stat-info"><span class="practice-stat-value">12</span><span class="practice-stat-label">Adobe</span></div> 863 </a> 864 </div> 865 <div class="swiper-slide"> 866 <a href="/company/airbnb" class="practice-stat-card"> 867 <div class="practice-stat-icon company-airbnb"><i class="fa-brands fa-airbnb"></i></div> 868 <div class="practice-stat-info"><span class="practice-stat-value">12</span><span class="practice-stat-label">Airbnb</span></div> 869 </a> 870 </div> 871 <div class="swiper-slide"> 872 <a href="/company/instagram" class="practice-stat-card"> 873 <div class="practice-stat-icon company-meta"><i class="fa-brands fa-instagram"></i></div> 874 <div class="practice-stat-info"><span class="practice-stat-value">11</span><span class="practice-stat-label">Instagram</span></div> 875 </a> 876 </div> 877 <div class="swiper-slide"> 878 <a href="/company/doordash" class="practice-stat-card"> 879 <div class="practice-stat-icon company-uber"><i class="fa-solid fa-burger"></i></div> 880 <div class="practice-stat-info"><span class="practice-stat-value">9</span><span class="practice-stat-label">DoorDash</span></div> 881 </a> 882 </div> 883 <div class="swiper-slide"> 884 <a href="/company/lyft" class="practice-stat-card"> 885 <div class="practice-stat-icon company-airbnb"><i class="fa-brands fa-lyft"></i></div> 886 <div class="practice-stat-info"><span class="practice-stat-value">9</span><span class="practice-stat-label">
886Lyft</span></div> 887 </a> 888 </div> 889 <div class="swiper-slide"> 890 <a href="/company/goldman-sachs" class="practice-stat-card"> 891 <div class="practice-stat-icon company-bloomberg"><i class="fa-solid fa-building-columns"></i></div> 892 <div class="practice-stat-info"><span class="practice-stat-value">8</span><span class="practice-stat-label">Goldman Sachs</span></div> 893 </a> 894 </div> 895 <div class="swiper-slide"> 896 <a href="/company/oracle" class="practice-stat-card"> 897 <div class="practice-stat-icon company-oracle"><i class="fa-solid fa-database"></i></div> 898 <div class="practice-stat-info"><span class="practice-stat-value">8</span><span class="practice-stat-label">Oracle</span></div> 899 </a> 900 </div> 901 <div class="swiper-slide"> 902 <a href="/company/bytedance" class="practice-stat-card"> 903 <div class="practice-stat-icon company-twitter"><i class="fa-brands fa-tiktok"></i></div> 904 <div class="practice-stat-info"><span class="practice-stat-value">8</span><span class="practice-stat-label">ByteDance</span></div> 905 </a> 906 </div> 907 </div> 908 </div> 909</div> 910 <!-- Search & Filters --> 911 <div class="practice-filters" id="filterForm"> 912 <div class="practice-search"> 913 <i class="fa-sharp fa-light fa-magnifying-glass practice-search-icon"></i> 914 <input type="text" id="problemSearch" placeholder="Search problems..." value=""> 915 </div> 916 <div class="practice-filter-btns"> 917 <button type="button" class="practice-filter-btn active" data-difficulty="">All</button> 918 <button type="button" class="practice-filter-btn " data-difficulty="Easy">Easy</button> 919 <button type="button" class="practice-filter-btn " data-difficulty="Medium">Medium</button> 920 <button type="button" class="practice-filter-btn " data-difficulty="Hard">Hard</button> 921 </div> 922 </div> 923 924 <!-- Problem Table --> 925 <div class="practice-table-container"> 926 <table class="practice-table"> 927 <thead> 928 <tr> 929 <th style="width:50px">#</th> 930 <th>Problem</th> 931 <th style="width:120px;">Difficulty</th> 932 <th style="width:280px;">Topics</th> 933 </tr> 934 </thead> 935 <tbody id="problemsTableBody"> 936 <tr> 937 <td>1</td> 938 <td><a href="/practice/add-one-row-to-tree.htm" class="practice-problem-link">Add One Row to Tree</a></td> 939 <td><span class="practice-difficulty medium">Medium</span></td> 940 <td><div class="practice-topics"><span class="practice-topic-tag">Tree</span><span class="practice-topic-tag">Depth-First Search</span><span class="practice-topic-tag">Breadth-First Search</span></div></td> 941 </tr> 942 <tr> 943 <td>2</td> 944 <td><a href="/practice/alien-dictionary.htm" class="practice-problem-link">Alien Dictionary</a></td> 945 <td><span class="practice-difficulty hard">Hard</span></td> 946 <td><div class="practice-topics"><span class="practice-topic-tag">Array</span><span class="practice-topic-tag">String</span><span class="practice-topic-tag">Depth-First Search</span></div></td> 947 </tr> 948 <tr> 949 <td>3</td> 950 <td><a href="/practice/all-ancestors-of-a-node-in-a-directed-acyclic-graph.htm" class="practice-problem-link">All Ancestors of a Node in a Directed Acyclic Graph</a></td> 951 <td><span class="practice-difficulty medium">Medium</span></td> 952 <td><div class="practice-topics"><span class="practice-topic-tag">Depth-First Search</span><span class="practice-topic-tag">Breadth-First Search</span><span class="practice-topic-tag">Graph</span></div></td> 953 </tr> 954 <tr> 955 <td>4</td> 956 <td><a href="/practice/all-elements-in-two-binary-search-trees.htm" class="practice-problem-link">All Elements in Two Binary Search Trees</a></td> 957 <td><span class="practice-difficulty medium">Medium</span></td> 958 <td><div class="practice-topics"><span class="practice-topic-tag">Tree</span><span class="practice-topic-tag">Depth-First Search</span><span class="practice-topic-tag">Binary Search Tree</span></div></td> 959 </tr> 960 <tr> 961 <td>5</td> 962 <td><a href="/practice/all-nodes-distance-k-in-binary-tree.htm" class="practice-problem-link">All Nodes Distance K in Binary Tree</a></td> 963 <td><span class="practice-difficulty medium">Medium</span></td> 964 <td><div class="practice-topics"><span class="practice-topic-tag">Hash Table</span><span class="practice-topic-tag">Tree</span><span class="practice-topic-tag">Depth-First Search</span></div></td> 965 </tr> 966 <tr> 967 <td>6</td> 968 <td><a href="/practice/all-paths-from-source-to-target.htm" class="practice-problem-link">All Paths From Source to Target</a></td> 969 <td><span class="practice-difficulty medium">Medium</span></td> 970 <td><div class="practice-topics"><span class="practice-topic-tag">Backtracking</span><span class="practice-topic-tag">Depth-First Search</span><span class="practice-topic-tag">Breadth-First Search</span></div></td> 971 </tr> 972 <tr> 973 <td>7</td> 974 <td><a href="/practice/amount-of-time-for-binary-tree-to-be-infected.htm" class="practice-problem-link">Amount of Time for Binary Tree to Be Infected</a></td> 975 <td><span class="practice-difficulty medium">Medium</span></td> 976 <td><div class="practice-topics"><span class="practice-topic-tag">Hash Table</span><span class="practice-topic-tag">Tree</span><span class="practice-topic-tag">Depth-First Search</span></div></td> 977 </tr> 978 <tr> 979 <td>8</td> 980 <td><a href="/practice/apply-substitutions.htm" class="practice-problem-link">Apply Substitutions</a></td> 981 <td><span class="practice-difficulty medium">Medium</span></td> 982 <td><div class="practice-topics"><span class="practice-topic-tag">Array</span><span class="practice-topic-tag">Hash Table</span><span class="practice-topic-tag">String</span></div></td> 983 </tr> 984 <tr> 985 <td>9</td> 986 <td><a href="/practice/array-nesting.htm" class="practice-problem-link">Array Nesting</a></td> 987 <td><span class="practice-difficulty medium">Medium</span></td> 988 <td><div class="practice-topics"><span class="practice-topic-tag">Array</span><span class="practice-topic-tag">Depth-First Search</span></div></td> 989 </tr> 990 <tr> 991 <td>10</td> 992 <td><a href="/practice/average-of-levels-in-binary-tree.htm" class="practice-problem-link">Average of Levels in Binary Tree</a></td> 993 <td><span class="practice-difficulty easy">Easy</span></td> 994 <td><div class="practice-topics"><span class="practice-topic-tag">Tree</span><span class="practice-topic-tag">Depth-First Search</span><span class="practice-topic-tag">Breadth-First Search</span></div></td> 995 </tr> 996 <tr> 997 <td>11</td> 998 <td><a href="/practice/balance-a-binary-search-tree.htm" class="practice-problem-link">Balance a Binary Search Tree</a></td> 999 <td><span class="practice-difficulty medium">Medium</span></td> 1000 <td><div class="practice-topics"><span class="practice-topic-tag">Divide and Conquer</span><span class="practice-topic-tag">Greedy</span><span class="practice-topic-tag">Tree</span></div></td> 1001 </tr> 1002 <tr> 1003 <td>12</td> 1004 <td><a href="/practice/balanced-binary-tree.htm" class="practice-problem-link">Balanced Binary Tree</a></td> 1005 <td><span class="practice-difficulty easy">Easy</span></td> 1006 <td><div class="practice-topics"><span class="practice-topic-tag">Tree</span><span class="practice-topic-tag">Depth-First Search</span><span class="practice-topic-tag">Binary Tree</span></div></td> 1007 </tr> 1008 <tr> 1009 <td>13</td> 1010 <td><a href="/practice/battleships-in-a-board.htm" class="practice-problem-link">Battleships in a Board</a></td> 1011 <td><span class="practice-difficulty medium">Medium</span></td> 1012 <td><div class="practice-topics"><span class="practice-topic-tag">Array</span><span class="practice-topic-tag">Depth-First Search</span><span class="practice-topic-tag">Matrix</span></div></td> 1013 </tr> 1014 <tr> 1015 <td>14</td> 1016 <td><a href="/practice/binary-search-tree-to-greater-sum-tree.htm" class="practice-problem-link">Binary Search Tree to Greater Sum Tree</a></td> 1017 <td><span class="practice-difficulty medium">Medium</span></td> 1018 <td><div class="practice-topics"><span class="practice-topic-tag">Tree</span><span class="practice-topic-tag">Depth-First Search</span><span class="practice-topic-tag">Binary Search Tree</span></div></td> 1019 </tr> 1020 <tr> 1021 <td>15</td> 1022 <td><a href="/practice/binary-tree-cameras.htm" class="practice-problem-link">Binary Tree Cameras</a></td> 1023 <td><span class="practice-difficulty hard">Hard</span></td> 1024 <td><div class="practice-topics"><span class="practice-topic-tag">Dynamic Programming</span><span class="practice-topic-tag">Tree</span><span class="practice-topic-tag">Depth-First Search</span></div></td> 1025 </tr> 1026 </tbody> 1027 </table> 1028 </div> 1029 1030 <!-- Pagination --> 1031 <div class="practice-pagination" id="problemsPagination"> 1032 <div class="practice-pagination-info">
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1307<script src="https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js"></script>
1307 1308
1308<script> 1309 new Swiper('.banner-slider', { 1310 slidesPerView: 'auto', 1311 spaceBetween: 16, 1312 freeMode: true, 1313 navigation: { 1314 nextEl: '.nav-next', 1315 prevEl: '.nav-prev', 1316 }, 1317 }); 1318 1319 // See All / Collapse Toggle 1320 const seeAllBtn = document.getElementById('seeAllBtn'); 1321 const collapseBtn = document.getElementById('collapseBtn'); 1322 const cardsGrid = document.getElementById('cardsGrid'); 1323 const cardsExpanded = document.getElementById('cardsExpanded'); 1324 1325 seeAllBtn.addEventListener('click', function() { 1326 cardsGrid.classList.add('hidden'); 1327 cardsExpanded.classList.add('active'); 1328 }); 1329 1330 collapseBtn.addEventListener('click', function() { 1331 cardsExpanded.classList.remove('active'); 1332 cardsGrid.classList.remove('hidden'); 1333 }); 1334 1335 // Initialize Practice Stats Slider 1336 new Swiper('.practice-stats-slider', { 1337 slidesPerView: 'auto', 1338 spaceBetween: 16, 1339 freeMode: true, 1340 navigation: { 1341 nextEl: '.practice-nav-next', 1342 prevEl: '.practice-nav-prev', 1343 }, 1344 }); 1345 1346 // Initialize Developer Tools Slider 1347 new Swiper('.dev-tools-slider', { 1348 slidesPerView: 'auto', 1349 spaceBetween: 16, 1350 freeMode: true, 1351 navigation: { 1352 nextEl: '.dev-tools-next', 1353 prevEl: '.dev-tools-prev', 1354 }, 1355 }); 1356 </script>
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1407<script src="/practice/js/practice-common.js?v6"></script>
1407 1408<!-- AJAX Filter & Pagination Script -->
1409<script> 1410(function() { 1411 const topicId = 'depth-first-search'; 1412 let currentPage = 1; 1413 let currentDifficulty = ''; 1414 let currentSearch = ''; 1415 let searchTimeout = null; 1416 let isLoading = false; 1417 1418 // Start Practicing button with spinner 1419 const startPracticingBtn = document.getElementById('startPracticingBtn'); 1420 if (startPracticingBtn) { 1421 startPracticingBtn.addEventListener('click', function(e) { 1422 e.preventDefault(); 1423 this.classList.add('loading'); 1424 1425 // Scroll to problems section 1426 const target = document.getElementById('topicProblemsSection'); 1427 if (target) { 1428 const headerOffset = 80; 1429 const elementPosition = target.getBoundingClientRect().top; 1430 const offsetPosition = elementPosition + window.pageYOffset - headerOffset; 1431 1432 window.scrollTo({ 1433 top: offsetPosition, 1434 behavior: 'smooth' 1435 }); 1436 1437 // Remove loading state after scroll completes 1438 setTimeout(() => { 1439 this.classList.remove('loading'); 1440 }, 800); 1441 } else { 1442 this.classList.remove('loading'); 1443 } 1444 }); 1445 } 1446 1447 // Elements 1448 const tableBody = document.getElementById('problemsTableBody'); 1449 const pagination = document.getElementById('problemsPagination'); 1450 const searchInput = document.getElementById('problemSearch'); 1451 const difficultyBtns = document.querySelectorAll('.practice-filter-btn[data-difficulty]'); 1452 1453 // Loading indicator 1454 function showLoading() { 1455 isLoading = true; 1456 tableBody.innerHTML = '<tr><td colspan="4" style="text-align:center;padding:40px;"><i class="fa-solid fa-spinner fa-spin" style="font-size:24px;color:#40A944;"></i></td></tr>'; 1457 } 1458 1459 // Fetch problems via AJAX 1460 function fetchProblems(page, callback) { 1461 if (isLoading) return; 1462 showLoading(); 1463 1464 const params = new URLSearchParams({ 1465 topic_id: topicId, 1466 page: page, 1467 ajax: '1' 1468 }); 1469 1470 if (currentDifficulty) params.append('difficulty', currentDifficulty); 1471 if (currentSearch) params.append('search', currentSearch); 1472 1473 fetch('/practice/topic-ajax.php?' + params.toString()) 1474 .then(response => response.json()) 1475 .then(data => { 1476 isLoading = false; 1477 if (callback) callback(); 1478 1479 if (data.success) { 1480 tableBody.innerHTML = data.tableHtml; 1481 pagination.innerHTML = data.paginationHtml; 1482 currentPage = data.page; 1483 1484 // Update URL for pagination (SEO-friendly, allows bookmarking) 1485 // Only update URL for pagination, not for filters (filters are AJAX-only) 1486 if (!currentDifficulty && !currentSearch) { 1487 const newUrl = buildPageUrl(data.page); 1488 history.pushState({ page: data.page }, '', newUrl); 1489 } 1490 1491 // Re-attach pagination click handlers 1492 attachPaginationHandlers(); 1493 1494 // Scroll to topic problems section with offset for sticky header 1495 const target = document.getElementById('topicProblemsSection'); 1496 const headerOffset = 80; // Account for sticky header height 1497 const elementPosition = target.getBoundingClientRect().top; 1498 const offsetPosition = elementPosition + window.pageYOffset - headerOffset; 1499 1500 window.scrollTo({ 1501 top: offsetPosition, 1502 behavior: 'smooth' 1503 }); 1504 } 1505 }) 1506 .catch(error => { 1507 isLoading = false; 1508 if (callback) callback(); 1509 console.error('Error fetching problems:', error); 1510 tableBody.innerHTML = '<tr><td colspan="4" style="text-align:center;padding:40px;color:#dc3545;">Error loading problems. Please try again.</td></tr>'; 1511 }); 1512 } 1513 1514 // Build SEO-friendly URL for pagination 1515 function buildPageUrl(page) { 1516 if (page <= 1) { 1517 return '/topic/' + topicId; 1518 } 1519 return '/topic/' + topicId + '/' + page; 1520 } 1521 1522 // Check if any filters are active 1523 function hasActiveFilters() { 1524 return currentDifficulty || currentSearch; 1525 } 1526 1527 // Attach click handlers to pagination links 1528 function attachPaginationHandlers() { 1529 document.querySelectorAll('.practice-pagination-btns a[data-page]').forEach(link => { 1530 link.addEventListener('click', function(e) { 1531 // If no filters active, let browser navigate normally (use cached page) 1532 if (!hasActiveFilters()) { 1533 // Show spinner on the clicked button for normal navigation 1534 this.innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i>'; 1535 this.style.pointerEvents = 'none'; 1536 // Set flag to scroll after page load 1537 sessionStorage.setItem('scrollToProblems', 'true'); 1538 return; // Don't prevent default - browser will navigate to href 1539 } 1540 1541 // Filters are active - use AJAX 1542 e.preventDefault(); 1543 const page = parseInt(this.getAttribute('data-page')); 1544 if (page && page !== currentPage) { 1545 // Show spinner on clicked button 1546 const clickedBtn = this; 1547 clickedBtn.innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i>'; 1548 clickedBtn.style.pointerEvents = 'none'; 1549 1550 fetchProblems(page, function() { 1551 // Restore button after load (though it will be replaced by new pagination HTML) 1552 clickedBtn.style.pointerEvents = ''; 1553 }); 1554 } 1555 }); 1556 }); 1557 } 1558 1559 // Check if we need to scroll after page load (from pagination click) 1560 if (sessionStorage.getItem('scrollToProblems') === 'true') { 1561 sessionStorage.removeItem('scrollToProblems'); 1562 // Scroll to problems section with offset for sticky header 1563 setTimeout(function() { 1564 const target = document.getElementById('topicProblemsSection'); 1565 if (target) { 1566 const headerOffset = 80; 1567 const elementPosition = target.getBoundingClientRect().top; 1568 const offsetPosition = elementPosition + window.pageYOffset - headerOffset; 1569 window.scrollTo({ top: offsetPosition, behavior: 'auto' }); 1570 } 1571 }, 100); 1572 } 1573 1574 // Difficulty filter click 1575 difficultyBtns.forEach(btn => { 1576 btn.addEventListener('click', function() { 1577 const diff = this.getAttribute('data-difficulty'); 1578 1579 // Update active state 1580 difficultyBtns.forEach(b => b.classList.remove('active')); 1581 this.classList.add('active'); 1582 1583 currentDifficulty = diff; 1584 currentPage = 1; // Reset to page 1 1585 fetchProblems(1); 1586 }); 1587 }); 1588 1589 // Search input with debounce 1590 searchInput.addEventListener('input', function() { 1591 clearTimeout(searchTimeout); 1592 const value = this.value.trim(); 1593 1594 searchTimeout = setTimeout(function() { 1595 currentSearch = value; 1596 currentPage = 1; // Reset to page 1 1597 fetchProblems(1); 1598 }, 400); // 400ms debounce 1599 }); 1600 1601 // Handle Enter key on search 1602 searchInput.addEventListener('keypress', function(e) { 1603 if (e.key === 'Enter') { 1604 clearTimeout(searchTimeout); 1605 currentSearch = this.value.trim(); 1606 currentPage = 1; 1607 fetchProblems(1); 1608 } 1609 }); 1610 1611 // Handle browser back/forward buttons 1612 window.addEventListener('popstate', function(e) { 1613 if (e.state && e.state.page) { 1614 fetchProblems(e.state.page); 1615 } 1616 }); 1617 1618 // Initial setup - attach pagination handlers 1619 attachPaginationHandlers(); 1620 1621 // Store initial state 1622 history.replaceState({ page: currentPage }, '', window.location.href); 1623})(); 1624</script>
1624 1625<!-- Google tag (gtag.js) -->
vendor: 64 bytes, lines 1625-1626
1625 1626<script async src="https://www.googletagmanager.com/gtag/js?id=
1626G-EX9ZP4VY84
vendor: 12 bytes, line 1626
1626"></script>
1627<script> 1628
vendor: 142 bytes, lines 1628-1631
1628window.dataLayer = window.dataLayer || []; 1629 function gtag(){dataLayer.push(arguments);} 1630 gtag('js', new Date()); 1631 gtag('config', '
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1632</script>
1632 1633</body> 1634</html>
Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.