Is It A Tree? (并查集) 思路:搞人的题,特判0 0 的时候 输出 "is a tree.", 存在回路的时候 输出 "is not a tree.", 存在两个联通分量的时候输出 "is not a tree."。也就是两个树的时候。 两个树要怎么判断呢 假设给出的所有的边,组成一棵树,利用并查集我们可以把他所有的子节点并到一个节点...
Is it a bug? → Pay attention Before contest Codeforces Round 1010 (Div. 1) 19:22:11 Register now » *has extra registration Before contest Codeforces Round 1010 (Div. 2) 19:22:10 Register now » *has extra registration → Top rated...
Is it a bug? → Pay attention Before contest Codeforces Round 1024 (Div. 1) 4 days Before contest Codeforces Round 1024 (Div. 2) 4 days → Top contributors #UserContrib. 1cry162 2Dominater069159 3Qingyu158 3-is-this-fft-158 5atcoder_official155...
74else75{76intflagg=0,node=0;77for(inti=1; i<maxn; i++)78{79if(vis[i]==1)80node++;81if(sum[i]>1)82flagg=1;83}84if(node==(edge+1)&&flagg==0)85{86printf("Case %d is a tree.\n",p++);87}88else89{90printf("Case %d is not a tree.\n",p++);91}92}93}94} 1....
4.空树也是树,即第一次输入的两个数字为0 0则是树,其他时候输入只是结束条件 因为POJ和HDU题面一样,要求不一样,所以这题解法唯一区别就是 HDU上用所有节点的总父节点唯一判断,而POJ则每输入两个数,判 断他们总父节点是否相等,相等则成环了. hdu AC代码:http://paste.ubuntu.com/25081598/ ...
poj1308 Is It A Tree 题目链接:http://poj.org/problem?id=1308 题意:给你一个有向图,问你这是不是一棵树 解析:输入有点坑,他可能没有一条边,其他的你只需要判断一下边数是不是等于点数-1,每个结点的前驱结点是不是只有一个...
The repository is organized by problem number and contest, making it easy to navigate and find specific solutions. Topics tree algorithm cplusplus cpp graph solutions string stl contest competitive-programming alice codeforces online-judge problem-solving competitive-programming-contests dsa codeforces-...
It is guaranteed, that the total sum of nn over all test cases doesn't exceed 105105. Output For each test case in the first line, print how many seconds will the robot spend in the worst case. In the next line, print the initial value of pp that you used to construct an answer....
Abduction, a.k.a. randomly guessing.This is the randomly guessing we are looking at. It means to seek the simplest and most likely conclusion from a set of observations. So what I am going to show you next is that abduction is not that bad, especially in a Codeforces setting. ...
CodeForces 372B. Counting Rectangles is Fun B. Counting Rectangles is Fun time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output There is ann × mrectangular grid, each cell of the grid contains a single integer: zero or one. Let'...