FB面经 Prepare: Make Parentheses valid

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FB面经 Prepare: Make Parentheses valid

给一组括号,remove最少的括号使得它valid 从左从右各scan一次 package fb; public class removeParen { public static String fix(String str) { StringBuffer res = new StringBuffer(str); int l = 0, r = 0; int i = 0; while (i < res.length()) { if (res.charAt(i) == '(') l++; else…

[LeetCode] 921. Minimum Add to Make Parentheses Valid 使括号有效的最少添加

Given a string S of '(' and ')' parentheses, we add the minimum number of parentheses ( '(' or ')', and in any positions ) so that the resulting parentheses string is valid. Formally, a parentheses string is valid if and only if: It is the empty stri…

LeetCode 921. 使括号有效的最少添加(Minimum Add to Make Parentheses Valid) 48

921. 使括号有效的最少添加 921. Minimum Add to Make Parentheses Valid 题目描述给定一个由 '(' 和 ')' 括号组成的字符串 S,我们需要添加最少的括号( '(' 或是 ')',可以在任何位置),以使得到的括号字符串有效. 从形式上讲,只有满足下面几点之一,括号字符串才是有效的: 它是一个空字符串,或者它可以被写成 AB (A 与 B 连接),其中 A 和 B 都是有效字符串,或者它可以被写作 (A),其中 A 是有效字符串. 给定一个括号…

72. Generate Parentheses && Valid Parentheses

Generate Parentheses 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 "(]"…

[Swift]LeetCode921.使括号有效的最少添加 | Minimum Add to Make Parentheses Valid

Given a string S of '(' and ')' parentheses, we add the minimum number of parentheses ( '(' or ')', and in any positions ) so that the resulting parentheses string is valid. Formally, a parentheses string is valid if and only if: It is the empty stri…

[leetcode-921-Minimum Add to Make Parentheses Valid]

Given a string S of '(' and ')' parentheses, we add the minimum number of parentheses ( '(' or ')', and in any positions ) so that the resulting parentheses string is valid. Formally, a parentheses string is valid if and only if: It is the empty stri…

921. Minimum Add to Make Parentheses Valid

Given a string S of '(' and ')' parentheses, we add the minimum number of parentheses ( '(' or ')', and in any positions ) so that the resulting parentheses string is valid. Formally, a parentheses string is valid if and only if: It is the empty stri…