20. 有效的括号 20. Valid Parentheses 题目描述 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. LeetCode20. Valid Parentheses 示例 1: 输入: "()" 输出: true 示例 2: 输入: "()[]{}" 输出: true 示例 3: 输…

题目:Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. For "(()", the longest valid parentheses substring is "()", which has length = 2. Another example i…

Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. For "(()", the longest valid parentheses substring is "()", which has length = 2. Another example is &…

第一道被我AC的hard题!菜鸡难免激动一下,不要鄙视.. Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. For "(()", the longest valid parentheses substring is "()", which has le…

题目 Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. For "(()", the longest valid parentheses substring is "()", which has length = 2. Another example i…

20. 有效的括号 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. 示例 1: 输入: "()" 输出: true 示例 2: 输入: "()[]{}" 输出: true 示例 3: 输入: "(]" 输出: false 示例 4: 输入: "([)]" 输出…

给定一个只包括 '(',')','{','}','[',']' 的字符串,判断字符串是否有效. Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. 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. An input string is valid if: Open bracke…

题目描述 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. 示例 1: 输入: "()" 输出: true 示例 2: 输入: "()[]{}" 输出: true 示例 3: 输入: "(]" 输出: false 示例 4: 输入: "([)]" 输出: fal…

题目:有效的括号序列 难度:Easy 题目内容: 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…

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…