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Leet code problem 7: reverse integer digit

Leet code problem 5 Longest Palindromic Substring

problem 3. Longest Substring Without Repeating Characters

problem 2: add two numbers

probem:1. Two Sum

leetcode problem: Reverse Nodes in k-Group

leetcode problem :23. Merge k Sorted Lists

leetcode problem 3sum

leetcode: 21. Merge Two Sorted Lists

leetcode problem 8: String to Integer (atoi)

LeetCode problem 10： Regular Expression Matching

leetcode problem 6: zigzag word