题目链接：https://vijos.org/problems/P1034并查集入门题   view code
1 #include <iostream>
2 #include <cstdio>
3 #include <cstdlib>
4 #include <cstring>
5 #include <cmath>
6 #include <algorithm>
7 using namespace std;
8 #define N 5010
9 int p[N];
10 int find(int x)
11 {
12 return p[x] != x ? p[x] = find(p[x]) : x;
13 }
14 int main()
15 {
16 int n, m, q;
17 int x, y, r1, r2;
18 scanf("%d%d%d", &n, &m, &q);
19 for (int i = 1; i <= n; i++) p[i] = i;
20 for (int i = 1; i <= m; i++)
21 {
22 scanf("%d%d", &x, &y);
23 r1 = find(x); r2 = find(y);
24 if (r1 != r2) p[r2] = r1;
25 }
26 for (int i = 1; i <= q; i++)
27 {
28 scanf("%d%d", &x, &y);
29 r1 = find(x); r2 = find(y);
30 if (r1 == r2) printf("Yes\n");
31 else printf("No\n");
32 }
33 return 0;
34
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