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#51 Combination Sum
Amazon Google Backtracking Arrays
Medium
2100M
55.4%
Solve
#52 Combination Sum II
Amazon Backtracking Sorting
Medium
1600M
49.7%
Solve
#53 Unique Paths
Google Dynamic Programming Grid
Medium
3000M
62.1%
Solve
#54 Unique Paths II
Amazon Microsoft Dynamic Programming Grid
Medium
1900M
39.3%
Solve
#55 Minimum Path Sum
Google Dynamic Programming Grid
Medium
2300M
59.0%
Solve
#56 Set Matrix Zeroes
Microsoft Matrix Simulation
Medium
2500M
53.8%
Solve
#57 Search a 2D Matrix
Amazon Matrix Binary Search
Medium
2100M
45.9%
Solve
#58 Kth Largest Element in an Array
Amazon Facebook Heap Quickselect
Medium
3200M
54.2%
Solve
#59 Product of Array Except Self
Google Apple Arrays Prefix Product
Medium
4100M
65.1%
Solve
#60 Find Minimum in Rotated Sorted Array
Microsoft Binary Search Arrays
Medium
2600M
48.5%
Solve
#61 Sort Characters By Frequency
Facebook Hash Table Heap
Medium
1900M
70.3%
Solve
#62 Top K Frequent Elements
Amazon Google Heap Hash Table
Medium
2800M
60.0%
Solve
#63 Binary Tree Right Side View
Amazon Microsoft Trees BFS
Medium
2100M
57.4%
Solve
#64 Kth Smallest Element in a BST
Google Trees BST
Medium
2300M
69.7%
Solve
#65 Serialize and Deserialize Binary Tree
Google Facebook Trees Serialization
Hard
1500M
53.2%
Solve
#66 Coin Change
Amazon Dynamic Programming Coins
Medium
3200M
45.0%
Solve
#67 Longest Increasing Subsequence
Google Microsoft Dynamic Programming Arrays
Medium
2600M
47.8%
Solve
#68 Course Schedule
Google Graphs BFS
Medium
2400M
45.6%
Solve
#69 Implement Trie (Prefix Tree)
Amazon Facebook Trie Design
Medium
2100M
56.3%
Solve
#70 Design Add and Search Words Data Structure
Google Microsoft Trie Backtracking
Medium
1900M
43.7%
Solve
#71 Clone Graph
Facebook Graphs BFS
Medium
2000M
49.9%
Solve
#72 Pacific Atlantic Water Flow
Amazon Google Graphs DFS
Medium
1700M
47.0%
Solve
#73 Number of Connected Components in an Undirected Graph
Google Graphs Union Find
Medium
1500M
52.8%
Solve
#74 Meeting Rooms II
Amazon Intervals Greedy
Medium
1800M
51.6%
Solve
#75 LRU Cache
Amazon Google Design Linked List
Hard
2500M
41.9%
Solve