传送门 题目大意 给定有一个长度为n n的括号序列,现在有两种操作: 在任意一个位置插入有一个左括号或右括号 将末尾的一个括号放到最前面 可以对这个序列进行若干次操作,问在使括号序列合法的前提下,长度最短是多少,如果有多组解,输出字典序最小的 分析 首先最后的长度一定等于(原字符串长度+左括号与右括号数量的差值),现在我们考虑让其的字典序尽量的小 我们预处理前缀和,’(‘为+1,’)'为-1 我们可以发现,最终的答案一定是从序列中的某一位开始循环n n次,最后补上需要补足的括号数的,然后我们就只…

                                    Bracket Sequence Time Limit: 3000MS   Memory Limit: 65536KB   64bit IO Format: %lld & %llu [Submit]   [Go Back]   [Status] Description There is a sequence of brackets, which supports two kinds of operations.1. we c…

[#138 div 1 A. Bracket Sequence] [原题] A. Bracket Sequence time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output A bracket sequence is a string, containing only characters "(", ")"…

E. Correct Bracket Sequence Editor time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Recently Polycarp started to develop a text editor that works only with correct bracket sequences (abbrev…

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…

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…

There is a sequence of brackets, which supports two kinds of operations. we can choose a interval [l,r], and set all the elements range in this interval to left bracket or right bracket. we can reverse a interval, which means that for all the element…

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…

题目地址:CF1095E Almost Regular Bracket Sequence 真的是尬,Div.3都没AK,难受QWQ 就死在这道水题上(水题都切不了,我太菜了) 看了题解,发现题解有错,不过还是看懂了QAQ 其实是一道好题 (话说CF的题有不好的么(雾 难在预处理 预处理两个数组: 前缀和:若 \(s_i\) 为 \((\) , \(s1_i=s1_{i-1}+1\) ,反之同理: 后缀和:若 \(s_i\) 为 \()\) , \(s2_i=s2_{i+1}+1\) ,反之亦同理…

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…