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Reverse Integer (E) 题目 Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: - 阅读全文
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ZigZag Conversion (M) 题目 The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this 阅读全文
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Median of Two Sorted Arrays (H) 题目 There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. 阅读全文
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Longest Substring Without Repeating Characters (M) 题目 Given a string, find the length of the longest substring without repeating characters. Example 1 阅读全文
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Add two numbers (M) 题目 You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and eac 阅读全文
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Two Sum (E) 题目 Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each inpu 阅读全文
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Longest Palindromic Substring (M) 题目 Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 100 阅读全文