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Description Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. For example, two is written as II in Roman numeral, jus 阅读全文
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title: LeetCode——010 Regular Expression Matching author: zzw top: false toc: true mathjax: false email: 819342493@qq.com date: 2020 02 19 22:05:32 upd 阅读全文
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Description Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Example 2: 阅读全文
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Description Implement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessary until the fir 阅读全文
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Description Given a 32 bit signed integer, reverse digits of an integer. Example 1: Example 2: Example 3: Solution: 翻转一个带字符整数 最高数值为【 2^31 2^31 1】32位系统 阅读全文
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Description The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a 阅读全文
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Description Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Example 2: 阅读全文
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Description Given a string, find the length of the longest substring without repeating characters. Example 1: Example 2: Example 3: Solution: 使用unorde 阅读全文
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You are given two non empty linked lists representing two non negative integers. The digits are stored in reverse order and each of their nodes contai 阅读全文
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Description 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 input w 阅读全文