电波 #include<bits/stdc++.h> using namespace std; #define LL long long #define maxn 30000 vector<int>q[maxn]; int dfn[maxn],low[maxn],st[maxn],vis[maxn],top; int num[maxn],i; void dfs(int u,int deep,int fa){ dfn[u]=deep; low[u]=deep; st[++top]=u…
推荐博客 :https://blog.csdn.net/qq_25576697/article/details/81138213 链接:https://www.nowcoder.com/acm/contest/139/A来源:牛客网 题目描述Count the number of n x m matrices A satisfying the following condition modulo (109+7).* Ai, j ∈ {0, 1, 2} for all 1 ≤ i ≤ n, 1 ≤…
Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to another field, Bessie and the rest of the herd are forced to cross near the Tree of Rotten Apples. The cows are now tired of often being forc…
Redundant Paths 分离的路径 题目描述 In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to another field, Bessie and the rest of the herd are forced to cross near the Tree of Rotten Apples. The cows are now tired of o…
