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APR CHALLENGES

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DATE PROBLEM TOPIC SOLUTION IMPORTANT
APR 1 Reverse String String LINK
APR 2 Valid Palindrome II String LINK 💡
APR 3 Next Permutation Two Pointers LINK 💡
APR 4 Swapping Nodes in a Linked List Linked List LINK 💡
APR 5 Container With Most Water Two Pointers LINK 💡
APR 6 3Sum With Multiplicity Hash Table LINK
APR 7 Last Stone Weight Heap LINK 💡
APR 8 Kth Largest Element in a Stream Heap LINK 💡
APR 9 Top K Frequent Elements Heap, Hash Table LINK 💡
APR 10 Baseball Game Stack LINK
APR 11 Shift 2D Grid Matrix LINK
APR 12 Game of Life Matrix LINK 💡
APR 13 Spiral Matrix II Matrix LINK 💡
APR 14 Search in a Binary Search Tree Binary Search Tree LINK 💡
APR 15 Trim a Binary Search Tree Binary Search Tree LINK 💡
APR 16 Convert BST to Greater Tree Binary Search Tree LINK 💡
APR 17 Increasing Order Search Tree Binary Search Tree LINK
APR 18 Kth Smallest Element in a BST Binary Search Tree LINK 💡
APR 19 Recover Binary Search Tree Binary Search Tree LINK 💡
APR 20 Binary Search Tree Iterator Binary Search Tree, Stack LINK 💡
APR 21 Design HashSet Hash Table LINK
APR 22 Design HashMap Hash Table LINK
APR 23 Encode and Decode TinyURL Hash Table LINK
APR 24 Design Underground System Hash Table LINK
APR 25 Peeking Iterator Design LINK
APR 26 Min Cost to Connect All Points Minimum Spanning Tree 💡
APR 27 Smallest String With Swaps Graph 💡
APR 28 Path With Minimum Effort Priority Queue, Graph LINK
APR 29 Is Graph Bipartite? Graph LINK 💡
APR 30 Evaluate Division Graph 💡