题目链接
https://www.acwing.com/problem/content/1251/
代码
cin 和 cout 会超时
#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
const int N = 1000010;
int p[N];
int find(int x)
{
if (p[x] != x)
p[x] = find(p[x]);
return p[x];
}
int main()
{
int n, m, q;
scanf("%d%d", &n, &m);
for (int i = 1; i <= n; i ++ )
p[i] = i;
while (m -- )
{
int a, b;
scanf("%d%d", &a, &b);
p[find(a)] = find(b);
}
scanf("%d", &q);
while (q -- )
{
int c, d;
scanf("%d%d", &c, &d);
if (find(c) == find(d))
puts("Yes");
else
puts("No");
}
return 0;
}