D. Array GCD 题目连接: http://codeforces.com/contest/624/problem/D Description You are given array ai of length n. You may consecutively apply two operations to this array: remove some subsegment (continuous subsequence) of length m < n and pay for it m·…
Array GCD 最后的序列里肯定有a[1], a[1]-1, a[1]+1, a[n], a[n]-1, a[n]+1中的一个,枚举质因子, dp去check #include<bits/stdc++.h> #define LL long long #define fi first #define se second #define mk make_pair #define PLL pair<LL, LL> #define PLI pair<LL, int> #de…
题 You are given array ai of length n. You may consecutively apply two operations to this array: remove some subsegment (continuous subsequence) of length m < n and pay for it m·a coins; change some elements of the array by at most 1, and pay b coins…
You are given array ai of length n. You may consecutively apply two operations to this array: remove some subsegment (continuous subsequence) of length m < n and pay for it m·a coins; change some elements of the array by at most 1, and pay b coins fo…
题 You are given array ai of length n. You may consecutively apply two operations to this array: remove some subsegment (continuous subsequence) of length m < n and pay for it m·a coins; change some elements of the array by at most 1, and pay b coins…
这是我第一次完整地参加codeforces的比赛! 成绩 news standings中第50. 我觉这个成绩不太好.我前半小时就过了前三题,但后面的两题不难,却乱搞了1.5h都没有什么结果,然后在等System test的时候,就有点头绪了,囧.肯定是我在比赛的时候太困了(这是借口吗?). A Save Luke 考你会不会编程. B Making a String 贪心即可.这题是Hack最多的题.幸好我没有被. C Graph and String 注意到,如果某两个点之间没有边,说明其中…
In a deck of cards, each card has an integer written on it. Return true if and only if you can choose X >= 2 such that it is possible to split the entire deck into 1 or more groups of cards, where: Each group has exactly X cards. All the cards in eac…
