| Leetcode 20 - Valid Parentheses |
String - Stack |
Leetcode |
Easy |
| Leetcode 33 - Search in Rotated Sorted Array |
Array - Binary Search |
Leetcode |
Medium |
| Leetcode 49 - Group Anagrams |
Arrays - HashMaps - String (Prefix Sum) |
Leetcode |
Medium |
| Leetcode 303 - Range Sum Query Immutable |
Arrays - Prefix Sum |
Leetcode |
Easy |
| Leetcode 560 - Subarray Sum Equals K |
Arrays - Prefix Sum |
Leetcode |
Medium |
| Leetcode 102 - Binary Tree Level Order Traversal |
Tree - Binary Tree - Breadth First Search |
Leetcode |
Medium |
| Leetcode 733 - Flood Fill |
Array - Matrix - Depth First Search - Breadth First Search |
Leetcode |
Medium |
| Leetcode 200 - Number of Islands |
Array - Matrix - Depth First Search - Breadth First Search |
Leetcode |
Medium |
| Leetcode 547 - Number of Provinces |
Graph - Union Find - Depth First Search - Breadth First Search |
Leetcode |
Medium |
| HackerRank - Roads and Libraries using the Union Find (Disjoint Sets) data structure |
Graph Theory - Union Find |
HackerRank |
Medium |
| Leetcode 1752 - Check if Array Is Sorted and Rotated |
Array |
Leetcode |
Easy |
| Leetcode 721 - Accounts Merge |
Union Find - Depth First Search - Breadth First Search |
Leetcode |
medium |