C. Replace To Make Regular Bracket Sequence time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given string s consists of opening and closing brackets of four kinds <>, {}, [], (). Th…

[链接]:CF [题意]:给你一个只含有括号的字符串,你可以将一种类型的左括号改成另外一种类型,右括号改成另外一种右括号 问你最少修改多少次,才能使得这个字符串匹配,输出次数 [分析]: 本题用到了栈.如果遇上左括号,就加进栈里.如果遇上右括号,就判断栈里的左括号是否和它匹配,不匹配就加一.不论匹不匹配,判断后都要让左括号出栈. 如果最后栈不为空,或者栈在循环结束前就为空,那么不论怎么改变,左右括号都不可能刚好匹配. [代码]: #include<cstdio> #include<cst…

C. Replace To Make Regular Bracket Sequence 题目连接: http://www.codeforces.com/contest/612/problem/C Description You are given string s consists of opening and closing brackets of four kinds <>, {}, [], (). There are two types of brackets: opening and…

Replace To Make Regular Bracket Sequence You are given string s consists of opening and closing brackets of four kinds <>, {}, [], (). There are two types of brackets: opening and closing. You can replace any bracket by another of the same type. For…

You are given string s consists of opening and closing brackets of four kinds <>, {}, [], (). There are two types of brackets: opening and closing. You can replace any bracket by another of the same type. For example, you can replace < by the bra…

题目链接:http://codeforces.com/contest/612/problem/C 解题思路: 题意就是要求判断这个序列是否为RBS,每个开都要有一个和它对应的关,如:<()>满足条件,但<(>)就不满足条件,反正直接就是用栈做就行了,完美符合题目要求. #include <bits/stdc++.h> using namespace std; stack<char>st; /*struct node{ int num,id; }a[20000…

C. Longest Regular Bracket Sequence Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/problemset/problem/5/C Description This is yet another problem dealing with regular bracket sequences. We should remind you that a bracket sequence…

(CodeForces - 5C)Longest Regular Bracket Sequence time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output This is yet another problem dealing with regular bracket sequences. We should remind you t…

题目传送门 /* 题意:求最长括号匹配的长度和它的个数 贪心+stack:用栈存放最近的左括号的位置,若是有右括号匹配,则记录它们的长度,更新最大值,可以在O (n)解决 详细解释:http://blog.csdn.net/taoxin52/article/details/26012167 */ #include <cstdio> #include <algorithm> #include <cstring> #include <cmath> #includ…

Almost Regular Bracket Sequence CodeForces - 1095E You are given a bracket sequence ss consisting of nn opening '(' and closing ')' brackets. A regular bracket sequence is a bracket sequence that can be transformed into a correct arithmetic expressio…