见题解链接https://blog.csdn.net/sdjzping/article/details/19160013 #include<bits/stdc++.h> using namespace std; #define maxn 750 #define mod 1000000007 int len,p[maxn]; ][]; char s[maxn]; void match(){ stack<int>stk; while(!stk.empty())stk.pop(); ;i…

https://www.nitacm.com/problem_show.php?pid=8314 思路:类似于https://blog.csdn.net/MIKASA3/article/details/51523563 #define IOS ios_base::sync_with_stdio(0); cin.tie(0); #include <cstdio>//sprintf islower isupper #include <cstdlib>//malloc exit strc…

Brackets Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 14226 Accepted: 7476 Description We give the following inductive definition of a "regular brackets" sequence: the empty sequence is a regular brackets sequence, if s is a regula…

We give the following inductive definition of a “regular brackets” sequence: the empty sequence is a regular brackets sequence, if s is a regular brackets sequence, then (s) and [s] are regular brackets sequences, and if a and b are regular brackets…

https://www.luogu.org/problemnew/show/P3146 一道区间dp的题,以区间长度为阶段; 但由于要处理相邻的问题,就变得有点麻烦; 最开始想了一个我知道有漏洞的方程 ][j]) f[i][j] = max(f[i][k],f[k + ][j]); ); 可能f[i][k] = f[i][j],但他们可合并的并未相邻; 可以这样 #include <bits/stdc++.h> #define read read() #define up(i,l,r) for…

标签: ACM 题目 Gappu has a very busy weekend ahead of him. Because, next weekend is Halloween, and he is planning to attend as many parties as he can. Since it's Halloween, these parties are all costume parties, Gappu always selects his costumes in such…

第一道自己做出来的区间dp题,兴奋ing,虽然说这题并不难. 从后向前考虑: 状态转移方程:dp[i][j]=dp[i+1][j](i<=j<len); dp[i][j]=Max(dp[i][j],dp[i+1][k-1]+dp[k+1][j]+1),(a[i]==a[j]&&i<len,j<len,k<len); #include<stdio.h> #include<string.h> #define N 300 int dp[N][…

二叉树问题 时间限制: 1 Sec  内存限制: 128 MB 题目描述 Petya Bulochkin很幸运:他得到了一份在"Macrohard"公司的工作.他想要展现他的才华,所以他要把他第一份工作做得尽可能好.这个任务是写一个搜索引擎.Petya知道一系列的整数A1,A2,--,Ak(k<=300, 1<=Ai<=10000000, Ai 都不相同)我们把这些数称作关键字.这个引擎应该要能回答这样的问题:"那里是不是有一个关键字是S?"我们已…

D. Minimum Triangulation time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a regular polygon with nn vertices labeled from 11 to nn in counter-clockwise order. The triangulatio…

非常经典的区间dp模板 对于每一个大于二的区间 我们显然都可以将它拆分成两个子序列 那么分别计算对于每个取最优值即可 #pragma GCC optimize("O2") #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> #include<queue> #include<stack…