题目链接:Funny Positive Sequence 题意:给出一个数列,如果它的前i(1<=i<=n)项和都是正的,那么这个数列是正的,问这个数列的这n种变换里, A(0): a1,a2,…,an-1,an A(1): a2,a3,…,an,a1 … A(n-2): an-1,an,…,an-3,an-2 A(n-1): an,a1,…,an-2,an-1 有多少是正的数列. 思路:比赛的时候想了很久很久,肯定是要求在一次线性扫描里solve这个两重循环才能解决的问题,最后想到应该是计算…

这个当时我没有做出来,看了很多人包括学长的代码才懂,我感觉最好的方法还是下面那一种,标记以谁开头的是不行的,我感觉有点不好理解,如果不懂举组样例在纸上写一下就会比较清楚了 #include<iostream> #include<cstdio> #include<cstring> using namespace std; #define LL long long LL a[]; ]; int main() { ; LL sum; scanf("%d",…

There are n integers a 1,a 2,…,a n-1,a n in the sequence A, the sum of these n integers is larger than zero. There are n integers b 1,b 2,…,b n-1,b n in the sequence B, B is the generating sequence of A and bi = a 1+a 2,+…+a i (1≤i≤n). If the element…

题目链接:http://acm.fzu.edu.cn/problem.php?pid=1914 题意: 给出一个数列,如果它的前i(1<=i<=n)项和都是正的,那么这个数列是正的,问这个数列的这n种变换里, A(0): a1,a2,-,an-1,an A(1): a2,a3,-,an,a1 - A(n-2): an-1,an,-,an-3,an-2 A(n-1): an,a1,-,an-2,an-1 问有多少个变换里,所以前缀和都是正整数. 思路:因为变换是a[n]后面接着a[1]所以我们把…

题意略. 思路: 我们应该着重关注负数对当前数列的影响,由于前缀和的性质,我们都是从当前数字向前加,这其实也是在枚举以哪个下标作为开头. 详见代码: #include<stdio.h> #include<iostream> #include<string.h> #include<algorithm> using namespace std; typedef long long LL; ; ; LL store[maxn]; bool visit[maxn];…

Given a sequence of integers S = {S1,S2,...,Sn}, you should determine what is the value of the maximum positive product involving consecutive terms of S. If you cannot find a positive sequence, you should consider 0 as the value of the maximum product…

Given a sequence of integers S = {S1, S2, . . . , Sn}, you should determine what is the value of themaximum positive product involving consecutive terms of S. If you cannot find a positive sequence,you should consider 0 as the value of the maximum pr…

Problem D - Maximum Product Time Limit: 1 second Given a sequence of integers S = {S1, S2, ..., Sn}, you should determine what is the value of the maximum positive product involving consecutive terms ofS. If you cannot find a positive sequence, you s…

LeetCode Maximum Product Subarray Description Given a sequence of integers S = {S1, S2, . . . , Sn}, you should determine what is the value of the maximum positive product involving consecutive terms of S. If you cannot find a positive sequence, you…

Problem D - Maximum Product Time Limit: 1 second Given a sequence of integers S = {S1, S2, ..., Sn}, you should determine what is the value of the maximum positive product involving consecutive terms of S. If you cannot find a positive sequence, you…