All 2400 Array 1371 String 628 Hash Table 513 Math 432 Dynamic Programming 397 Sorting 331 Greedy 300 Depth-First Search 253 Binary Search 205 Breadth-First Search 197 Matrix 196 Tree 191 Two Pointers 178 Bit Manipulation 174 Binary Tree 151 Prefix Sum 138 Simulation 136 Stack 133 Counting 119 Heap Priority Queue 111 Graph 111 Design 102 Backtracking 99 Sliding Window 98 Union Find 71 Enumeration 70 Linked List 67 Trie 46 Number Theory 42 Monotonic Stack 42 Recursion 42 Ordered Set 41 Divide and Conquer 38 Binary Search Tree 38 Bitmask 36 Memoization 36 Queue 32 Geometry 31 Topological Sort 29 Combinatorics 28 Segment Tree 26 Hash Function 24 Game Theory 22 String Matching 21 Binary Indexed Tree 19 Rolling Hash 17 Shortest Path 16 Data Stream 15 Brainteaser 12 Randomized 12 Monotonic Queue 11 Interactive 10 Doubly-Linked List 9 Merge Sort 9 Counting Sort 8 Iterator 8 Probability and Statistics 6 Quickselect 6 Bucket Sort 6 Suffix Array 5 Line Sweep 5 Minimum Spanning Tree 4 Reservoir Sampling 4 Strongly Connected Component 3 Eulerian Circuit 3 Radix Sort 2 Rejection Sampling 2 Biconnected Component 1