Subsequences Summing to Sevens 题目描述 Farmer John's N cows are standing in a row, as they have a tendency to do from time to time. Each cow is labeled with a distinct integer ID number so FJ can tell them apart. FJ would like to take a photo of a conti…

[USACO16JAN]子共七Subsequences Summing to Sevensa[i]表示前缀和如果a[i]%7==t&&a[j]%7==t那么a[j]-a[i-1]一定是7的整数倍,这样就o(n)扫一遍,不断更新答案就可以了. #include<iostream> #include<cstdio> #include<queue> #include<algorithm> #include<cmath> #include…

P3131 [USACO16JAN]子共七Subsequences Summing to Sevens 题目描述 Farmer John's NN cows are standing in a row, as they have a tendency to do from time to time. Each cow is labeled with a distinct integer ID number so FJ can tell them apart. FJ would like to t…

题目大意:给个序列,求最长的连续子序列使其为7的倍数 又是一道令人欢喜的不用怎么用脑的水题.. 边读入,边计算前缀和 分别保存前缀和%7结果为1,2,3,4,5,6的第一次的位置 然后减一减就知道长度啦. #include<stdio.h> #include<string.h> #include<algorithm> using namespace std; ],ans; ]; int main(){ scanf("%d", &n); ans…

前缀和. 设f[i]为前缀和%7=i的第一个点.那么答案就是max(i-f[s[i]%7])了. #include<cstdio> #include<algorithm> #include<cstring> using namespace std; + ; int a[maxn],s[maxn]; ],n,ans; int main() { ;i<;i++) f[i]=-; scanf("%d",&n); ;i<=n;i++) {…

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本篇博客按照题号排序(带*为推荐题目) 1008 [HNOI2008]越狱 很经典的题了..龟速乘,龟速幂裸题,, 1010 [HNOI2008]玩具装箱toy* 斜率优化 基本算是裸题. 1012 最大数 单调队列/单调栈 随便搞一搞就好 (水题...) 1045 糖果传递(双倍经验请做 3293 分金币) 贪心+中位数  排序后搞一搞可过..(水题...) 1051 受欢迎的牛* tarjan (提高T1+ -- T2难度) 1106: [POI2007]立方体大作战tet* 树状数组+贪心…

P3131 [USACO16JAN]子共七Subsequences Summing to Sevens 题目描述 Farmer John's cows are standing in a row, as they have a tendency to do from time to time. Each cow is labeled with a distinct integer ID number so FJ can tell them apart. FJ would like to take…

题目链接: C. Subsequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output For the given sequence with n different elements find the number of increasing subsequences with k + 1 elements. It is…

Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the characters without disturbing the relative…