链接: https://codeforces.com/contest/1228/problem/E 题意: You have n×n square grid and an integer k. Put an integer in each cell while satisfying the conditions below. All numbers in the grid should be between 1 and k inclusive. Minimum number of the i-t…

Codeforces Round #589 (Div. 2)-E. Another Filling the Grid-容斥定理 [Problem Description] 在\(n\times n\)的格子中填入\([1,k]\)之间的数字,并且保证每一行至少有一个\(1\),每一列至少有一个\(1\),问有多少种满足条件的填充方案. [Solution] 令\(R[i]\)表示为第\(i\)行至少有一个\(1\)的方案数,\(C[i]\)表示第\(i\)列至少有一个\(1\)的方案数.则题目要…

https://codeforces.com/contest/1228/problem/A A. Distinct Digits 超级简单嘻嘻,给你一个l和r然后寻找一个数,这个数要满足的条件是它的每一位的数字不相同,找出满足要求的最小的那个数输出,没有找到就输出-1: #include<bits/stdc++.h> using namespace std; bool check(int n){ ]={}; while(n){ ]) vis[n%]=; else return false; n…

Codeforces Round #267 (Div. 2) C. George and Job题目链接请点击~ The new ITone 6 has been released recently and George got really keen to buy it. Unfortunately, he didn't have enough money, so George was going to work as a programmer. Now he faced the follow…

目录 Contest Info Solutions A. Distinct Digits B. Filling the Grid C. Primes and Multiplication D. Complete Tripartite E. Another Filling the Grid Contest Info Practice Link Solved A B C D E F 5/6 O O O O Ø - O 在比赛中通过 Ø 赛后通过 ! 尝试了但是失败了 - 没有尝试 Solutions…

链接: https://codeforces.com/contest/1228/problem/B 题意: Suppose there is a h×w grid consisting of empty or full cells. Let's make some definitions: ri is the number of consecutive full cells connected to the left side in the i-th row (1≤i≤h). In partic…

题意:问有多少种组合方法让每一行每一列最小值都是1 思路:我们可以以行为转移的状态 附加一维限制还有多少列最小值大于1 这样我们就可以不重不漏的按照状态转移 但是复杂度确实不大行(减了两个常数卡过去的...) #include <bits/stdc++.h> using namespace std; const int inf = 0x3f3f3f3f; const double eps = 1e-6; const int N = 3e5+7; typedef long long ll; co…

Is that a kind of fetishism? No, he is objectively a god. 见识了一把 Mcdic 究竟出题有多神. (虽然感觉还是吹过头了) 开了场 Virtual 玩. 开场先秒了 AB.C 居然差点没做出来,有点耻辱. 开 D.怎么不会--Div. 2 的 D 都能卡住我,我心态崩了. 调到 E. woc 这不是 sb 题吗-- 回来肝 D.想了想口胡出来了,然而心态已经崩了,用了很长很长时间才打出来. 最后只剩 20min 时开 F.这--辣鸡三合…

链接: https://codeforces.com/contest/1228/problem/D 题意: You have a simple undirected graph consisting of n vertices and m edges. The graph doesn't contain self-loops, there is at most one edge between a pair of vertices. The given graph can be disconne…

链接: https://codeforces.com/contest/1228/problem/C 题意: Let's introduce some definitions that will be needed later. Let prime(x) be the set of prime divisors of x. For example, prime(140)={2,5,7}, prime(169)={13}. Let g(x,p) be the maximum possible int…