此文章 同步发布在CSDN:https://blog.csdn.net/weixin_44385565/article/details/89819984   1118 Birds in Forest (25 分)   Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree…

并查集合并 #include<iostream> using namespace std; const int MAX = 10010; int father[MAX],root[MAX]; int findfather(int x){ if(x==father[x]) return x; else{ int F=findfather(father[x]); father[x]=F; return F; } } void Union(int a , int b){ int faA=findfa…

如题... #include <iostream> #include <cstdio> #include <algorithm> #include <string.h> using namespace std; /* 并查集水题 */ +; struct UF{ int father[maxn]; void init(){ ;i<maxn;i++) father[i]=i; } int find_root(int x){ if(father[x]!=x…

1118. Birds in Forest (25) Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree. You are supposed to help the scientists to count the maximum number of trees in…

Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree. You are supposed to help the scientists to count the maximum number of trees in the forest, and for any pai…

题意: 输入一个正整数N(<=10000),接着输入N行数字每行包括一个正整数K和K个正整数,表示这K只鸟是同一棵树上的.输出最多可能有几棵树以及一共有多少只鸟.接着输入一个正整数Q,接着输入Q行每行包括两个正整数,输出它们是否在同一棵树上. AAAAAccepted code: #define HAVE_STRUCT_TIMESPEC #include<bits/stdc++.h> using namespace std; ]; ]; int find_(int x){ if(x==f…

思路:并查集一套带走. AC代码 #include <stdio.h> #include <string.h> #include <algorithm> using namespace std; const int maxn = 10000+5; int par[maxn], vis[maxn]; int findRoot(int x) { return x == par[x] ? x : par[x] = findRoot(par[x]); } void unionS…

1118 Birds in Forest (25 分) Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree. You are supposed to help the scientists to count the maximum number of trees in…

1118 Birds in Forest (25 分) Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree. You are supposed to help the scientists to count the maximum number of trees in…

PAT1067. Sort with Swap(0, *) (25) 并查集 题目大意 给定一个序列, 只能进行一种操作: 任一元素与 0 交换位置, 问最少需要多少次交换. 思路 最优解就是每次 0 都和所在位置本应在的元素交换位置, 共 n - 1 次, 但是在交换中 0 可能会被交换到 0 号位置. 仔细思考一下, 其实每次换到 0 就是一个图的连通分量, 按照输入的次序和输入的值, 可以求出图共有多少个联通分量. 每个联通分量若要换回去, 需要 n - 1 次交换, 但是只能用 0 交换…