【CodeForces - 1096D】Easy Problem(dp,思维) 题目大意: 现在有一个由小写字母组成的字符串,去掉这个字符串的第i个位置的字符会有ai的代价。你的任务是去掉这个字符串中的一些字符使得该字符串中不包含子序列hard,且去掉字符的代价之和尽可能小。 输入 第一行一个整数n表示字符串的长度(1<=n<=100000)。 第...
dp[i][x=0,1,2,3]dp[i][x=0,1,2,3]的状态是前ii个字母,第二维xx代表:00——不包含任何有可能构成 “hardhard” 的子序列;11——含有 “hh” 子序列;22——含有 “haha” 子序列;33——含有harhar子序列。 dp[i][x=0,1,2,3]dp[i][x=0,1,2,3]记录的值当然就是歧义程度。 转移的...
【Codeforces 1096D】Easy Problem 【链接】我是链接,点我呀:) 【题意】 让你将一个字符串删掉一些字符。 使得字符串中不包含子序列"hard" 删掉每个字符的代价已知为ai 让你求出代价最小的方法. 【题解】 设dp[i][j]表示前i个字符,已经和"hard"匹配前j个的最小花费。 对于dp[i][j] 对s[i+1]分类...
i tried two pointers and it failed, then I looked at the solution. It was DP but I could not get the idea on how to think and understand that, Can anyone explain in easiest words to me please ? Thanks Spoiler gholyoattractors1.618034 Key idea: The problem can be broken down into two...
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https://codeforces.com/contest/1089/problem/E Elma is learning chess figures. She learned that a rook can move either horizontally or vertically. To enhance her understanding of rook movement Elma’s grandmother gave Elma an 8 × 8 chess board and asked her to find a way to mov...
CodeForces 1255E1Send Boxes to Alice (Easy Version) This is the easier version of the problem. In this version, Christmas is coming, and our protagonist, Bob, is preparing a spectacular present for his long-time best friend Alice. This year, he decides to prepare n boxes of chocolate, ...
Codeforces Round 893 (Div. 2) E1. Rollbacks (Easy Version) https://codeforces.com/contest/1858/problem/E1 3 seconds / 256 megabytes standard input / standard output Problem This is an easy version of this problem. The only difference between the versions is that you have to solve the ha...
【Codeforces 1451 E1】Bitwise Queries (Easy Version),交互题,位运算,猜数组 【摘要】 problem E1. Bitwise Queries (Easy Version) time limit per test4 seconds memory limit per test256 mega... problem E1. Bitwise Queries (Easy Version)
链接: http://www.codeforces.com/problemset/problem/236/B 题目: B. Easy Number Challenge time limit per test 2 seconds memory limit per test 256 megabytes input standard i ...