题目链接:https://cn.vjudge.net/problem/UVALive-8078 题意 括号序列T是这样定义的: T是个空的 T是(T), {T}, 或者 [T] T是两个T组成的,比如()()就是一个T 现在给一个n个字符长的串,问以每个字符为左端点的最长括号序列是多长. 思路 显然对i这个地方可以讨论一下: 如果i是个右括号,答案是0. 如果i是个左括号: 如果以i+1为起点的最长串后边的字符与左括号匹配,答案是加上这个字符后边的最长串. 如果不匹配,答案是0. 细节上注意不要…

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…

题意:给定一个n*m的网格,每个格子里有A矿和B矿数量,A必须由右向左运,B只能从下向上运,中间不能间断,问最大总数量. 析:一个简单DP,dp[i][j] 表示 从 (0, 0) 到 (i, j) 最大人运输量.要么向左运输,要么向上运输,取最大值. 代码如下: #pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <string> #include…

题目 传送门:QWQ 分析 洛谷题解里有一位大佬讲的很好. 就是先用栈预处理出可以匹配的左右括号在数组中设为1 其他为0 最后求一下最长连续1的数量. 代码 #include <bits/stdc++.h> using namespace std; ; char s[maxn]; int vis[maxn], Stack[maxn], top; int main(){ scanf(); ); ;i<=n;i++){ if(s[i]=='('){ Stack[++top]=i; } els…

题目传送门 /* 题意:两行数字,相邻列一上一下,或者隔一列两行都可以,从左到右选择数字使和最大 DP:状态转移方程:dp[i][j] = max (dp[i][j], dp[1-i][j-1] + a[i][j], dp[i/1-i][j-2] + a[i][j]); 要从前面一个转态推过来啊,我比赛写反了,内功不够:( */ #include <cstdio> #include <algorithm> #include <iostream> #include <…

A bracket sequence is a string, containing only characters "(", ")", "[" and "]". A correct bracket sequence is a bracket sequence that can be transformed into a correct arithmetic expression by inserting characters…

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. Writing Code Time Limit: 20 Sec  Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/544/problem/C Description Programmers working on a large project have just received a task to write exactly m lines of code. There are n programmers working o…

题目传送门 /* 找规律:看看前10项就能看出规律,打个表就行了.被lld坑了一次:( */ #include <cstdio> #include <algorithm> #include <iostream> #include <cstring> #include <cmath> #include <string> #include <vector> #include <queue> #include <…