Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the validity of a string by these rules: Any left parenthesis '(' must have a corresponding right parenthesi…

Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the validity of a string by these rules: Any left parenthesis '(' must have a corresponding right parenthesi…

Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the validity of a string by these rules: Any left parenthesis '(' must have a corresponding right parenthesi…

原题链接在这里:https://leetcode.com/problems/valid-parenthesis-string/description/ 题目: Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the validity of a string by…

[LeetCode]678. Valid Parenthesis String 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/valid-parenthesis-string/description/ 题目描述: Given a string containing only three types…

678. Valid Parenthesis String Medium Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the validity of a string by these rules: Any left parenthesis '(' must…

Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome. Example 1: Input: "aba" Output: True Example 2: Input: "abca" Output: True Explanation: You could delete the character 'c'. N…

https://leetcode.com/problems/valid-parenthesis-string/description/ 这个题的难点在增加了*,*可能是(也可能是).是(的前提是:右边有多余的).是)的前提是:左边有多余的(.所以他们的位置信息是重要的. class Solution { public: bool checkValidString(string s) { // *可以是(或者), 用openMax/Min来表示最多和最少可能没有被匹配的(的数目. // openM…

题目描述 编写一个函数,其作用是将输入的字符串反转过来. 示例 1: 输入: "hello" 输出: "olleh" 示例 2: 输入: "A man, a plan, a canal: Panama" 输出: "amanaP :lanac a ,nalp a ,nam A" 思路 思路一: 逆序拼接字符串 思路二: 依次交换两边的值 思路三: 直接调用StringBuilder 的 reverse() 思路四: 用栈来实现反…

Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the validity of a string by these rules: Any left parenthesis '(' must have a corresponding right parenthesi…

题目: Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the validity of a string by these rules: 1.Any left parenthesis '(' must have a corresponding right pare…

Given a sequence of words, check whether it forms a valid word square. A sequence of words forms a valid word square if the kth row and column read the exact same string, where 0 ≤k < max(numRows, numColumns). Note: The number of words given is at le…

Given a non-empty string s and an abbreviation abbr, return whether the string matches with the given abbreviation. A string such as "word" contains only the following valid abbreviations: ["word", "1ord", "w1rd", &…

Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers. You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or…

A Tic-Tac-Toe board is given as a string array board. Return True if and only if it is possible to reach this board position during the course of a valid tic-tac-toe game. The board is a 3 x 3 array, and consists of characters " ", "X"…

Two strings X and Y are similar if we can swap two letters (in different positions) of X, so that it equals Y. For example, "tars" and "rats" are similar (swapping at positions 0 and 2), and "rats" and "arts" are si…

［抄题］: You need to construct a binary tree from a string consisting of parenthesis and integers. The whole input represents a binary tree. It contains an integer followed by zero, one or two pairs of parenthesis. The integer represents the root's valu…

Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively. Below is one possible representation of s1 = "great": great / \ gr eat / \ / \ g r e at / \ a t To scramble the string, we may ch…

Given a string and an integer k, you need to reverse the first k characters for every 2k characters counting from the start of the string. If there are less than k characters left, reverse all of them. If there are less than 2k but greater than or eq…

Special binary strings are binary strings with the following two properties: The number of 0's is equal to the number of 1's. Every prefix of the binary string has at least as many 1's as 0's. Given a special string S, a move consists of choosing two…

Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: [ "((()))", "(()())", "(())()", "()(())", "()()()" ]   …

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]"…

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct…

题目 678. 有效的括号字符串 给定一个只包含三种字符的字符串:( ,) 和 *,写一个函数来检验这个字符串是否为有效字符串.有效字符串具有如下规则: 任何左括号 ( 必须有相应的右括号 ). 任何右括号 ) 必须有相应的左括号 ( . 左括号 ( 必须在对应的右括号之前 ). * 可以被视为单个右括号 ) ,或单个左括号 ( ,或一个空字符串. 一个空字符串也被视为有效字符串. 示例 1: 输入: "()" 输出: True 示例 2: 输入: "(*)" 输出…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目讲解 划分规则讲解 返回结果讲解 解题方法 代码 日期 题目地址:https://leetcode-cn.com/problems/maximum-nesting-depth-of-two-valid-parentheses-strings/ 题目描述 有效括号字符串 定义:对于每个左括号,都能找到与之对应的右括号,反之亦然.详情参见题末「有效括号字符串」部分. 嵌套…

题目: Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases. Notes: It is intended for this problem to be…

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example,"A man, a plan, a canal: Panama"is a palindrome."race a car"is not a palindrome. Note: Have you consider that the…

有效的括号字符串 给定一个只包含三种字符的字符串:( ,) 和 *,写一个函数来检验这个字符串是否为有效字符串.有效字符串具有如下规则: 任何左括号 ( 必须有相应的右括号 ). 任何右括号 ) 必须有相应的左括号 ( . 左括号 ( 必须在对应的右括号之前 ). * 可以被视为单个右括号 ) ,或单个左括号 ( ,或一个空字符串. 一个空字符串也被视为有效字符串. 示例 1: 输入: "()" 输出: True 示例 2: 输入: "(*)" 输出: True 示…

括号字符串是否有效 给定一个只包括 '(',')','{','}','[',']' 的字符串,判断字符串是否有效. 有效字符串需满足: 左括号必须用相同类型的右括号闭合. 左括号必须以正确的顺序闭合. 注意空字符串可被认为是有效字符串. ``` /** * 给定一个只包括 '(',')','{','}','[',']' 的字符串,判断字符串是否有效. * 有效字符串需满足: * 左括号必须用相同类型的右括号闭合. * 左括号必须以正确的顺序闭合. * 注意空字符串可被认为是有效字符串. * <p…

Given an input string, reverse the string word by word. A word is defined as a sequence of non-space characters.The input string does not contain leading or trailing spaces and the words are always separated by a single space.For example,Given s = "t…