Start Solving

#1 Two Sum
Google Amazon Arrays Hash Table
Easy
2500M
47.3%
Solve
#2 Add Two Numbers
Amazon Apple Linked List Math
Medium
1800M
32.1%
Solve
#3 Longest Substring Without Repeating Characters
Google Amazon Microsoft Strings Sliding Window
Medium
2200M
33.5%
Solve
#4 Median of Two Sorted Arrays
Google Facebook Arrays Binary Search
Hard
1200M
25.8%
Solve
#5 Longest Palindromic Substring
Amazon Microsoft Strings Dynamic Programming
Medium
1600M
28.9%
Solve
#6 ZigZag Conversion
Apple Strings
Medium
900M
35.2%
Solve
#7 Reverse Integer
Google Amazon Math
Easy
2100M
25.5%
Solve
#8 String to Integer (atoi)
Amazon Microsoft Strings Math
Medium
1400M
14.6%
Solve
#9 Palindrome Number
Google Math
Easy
1900M
51.2%
Solve
#10 Container With Most Water
Google Amazon Arrays Two Pointers
Medium
1700M
52.3%
Solve
#11 Regular Expression Matching
Google Facebook Microsoft Strings Dynamic Programming
Hard
800M
26.4%
Solve
#12 Binary Tree Level Order Traversal
Amazon Apple Trees BFS
Medium
1500M
60.1%
Solve