Is It A Tree? Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 16702    Accepted Submission(s): 3761 Problem Description A tree is a well-known data structure that is either empty (null, void, n…

Is It A Tree? Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 20222    Accepted Submission(s): 456 Problem Description A tree is a well-known data structure that is either empty (null, void, not…

版权声明:本文为博主原创文章.未经博主同意不得转载. https://blog.csdn.net/shengweisong/article/details/34099151 做了一上午,最终ac了 wa了一次主要是忘了还有环!.!   主要是运用并查集知识.又复习了一次!! 思路:输入之后找能不能成环,成环就不是,其次还要推断是不是有两个父节点,假设有两个父节点也不是.之后就找相关的祖先就好了. 还要注意:假设仅仅有一个节点,也是树.假设有两个或多个根节点也不是树:假设没有根节点也不是 链接pi…

Is It A Tree? Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 26002   Accepted: 8879 Description A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edge…

Petya loves lucky numbers. We all know that lucky numbers are the positive integers whose decimal representations contain only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not. One day Petya encountered a tre…

tree 把每条边权是1的边断开,发现每个点离他最近的点个数就是他所在的连通块大小. 开一个并查集,每次读到边权是0的边就合并.最后Ans​i​​=size[findset(i)],size表示每个并查集根的size Ans_i=size[findset(i)],sizeAns​i​​=size[findset(i)],size表示每个并查集根的sizesize. #include<cstdio> #include<cstring> #include<algorithm>…

题目链接:http://acm.swust.edu.cn/problem/856/ Time limit(ms): 1000 Memory limit(kb): 10000 Description There are N trees in a forest. At first, each tree contains only one node as its root. And each node is marked with a number. You're asked to do the fo…

D. Fix a Tree time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output A tree is an undirected connected graph without cycles. Let's consider a rooted undirected tree with n vertices, numbered 1 th…

Is It A Tree? Time Limit:1000MS     Memory Limit:10000KB     64bit IO Format:%I64d & %I64u Submit Status Description A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by direct…

tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 986    Accepted Submission(s): 452题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5606 Problem Description There is a tree(the tree is a conne…