<题目链接> 题目大意: 给你一个字符串,每个字符有权值,问现在删除字符串中的字符使其中没有"hard"的最小代价是多少. 解题分析: 用DP来求解:        转载于 >>> dp[i][1]:表示字符串s的前i个字符中不含有前缀'h'的最小代价 dp[i][2]:表示字符串s的前i个字符中不含有前缀'ha'的最小代价 dp[i][3]:表示字符串s的前i个字符中不含有前缀'har'的最小代价 dp[i][4]:表示字符串s的前i个字符中不含有前缀'…

题目链接:http://codeforces.com/problemset/problem/1096/D 题意: 给出一个小写字母组成的字符串,如果该字符串的某个子序列为 $hard$,就代表这个字符串是不好的. 现在你要删掉若干字母,使得字符串是好的,同时删除第 $i$ 个字母会使得歧义程度增加 $a[i]$,你需要让歧义程度最低,输出这个值. 题解: $dp[i][x=0,1,2,3]$ 的状态是前 $i$ 个字母,第二维 $x$ 代表:$0$——不包含任何有可能构成 “$hard$” 的子…

含[三点坐标计算面积].[判断两线段是否有交点].[求线段交点]模板   An Easy Problem?! Time Limit: 1000MS   Memory Limit: 65536K Total Submissions:15921   Accepted: 2459 Description It's raining outside. Farmer Johnson's bull Ben wants some rain to water his flowers. Ben nails two…

Codeforces 1027E Inverse Coloring 题目链接 #include<bits/stdc++.h> using namespace std; #define N 1010 #define LL long long #define Mod 998244353 int n,k; LL dp[N][N],ans=; LL sum[N][N]; int main(){ cin>>n>>k; dp[][]=; ;i<=n;i++) ;j<=i…

[CodeForces - 1225E]Rock Is Push [dp][前缀和] 标签:题解 codeforces题解 dp 前缀和 题目描述 Time limit 2000 ms Memory limit 524288 kB Source Technocup 2020 - Elimination Round 2 Tags binary search dp *2200 Site https://codeforces.com/problemset/problem/1225/E 题面 Examp…

HDOJ 1423 Greatest Common Increasing Subsequence [DP][最长公共上升子序列] Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 8768 Accepted Submission(s): 2831 Problem Description This is a problem from ZOJ 24…

HDOJ 1501 Zipper [DP][DFS+剪枝] Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 10886 Accepted Submission(s): 3925 Problem Description Given three strings, you are to determine whether the third str…

HDOJ 1257 最少拦截系统 [DP] Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 50753 Accepted Submission(s): 19895 Problem Description 某国为了防御敌国的导弹袭击,发展出一种导弹拦截系统.但是这种导弹拦截系统有一个缺陷:虽然它的第一发炮弹能够到达任意的高度,但是以后每一发炮弹…

HDOJ 1159 Common Subsequence[DP] Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 44280 Accepted Submission(s): 20431 Problem Description A subsequence of a given sequence is the given sequence wit…

HDOJ_1087_Super Jumping! Jumping! Jumping! [DP] Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 44670 Accepted Submission(s): 20693 Problem Description Nowadays, a kind of chess game called "Super…