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- #include <iostream>
- #include <cstdio>
- using namespace std;
- int n, r, p;
- int c[101][101];
- int v[101];
- void f(int x)
- {
- v[x] = 1;
- for(int y = 1; y <= n; y++)
- {
- if(c[x][y] == 1 and v[y] != 1)
- {
- f(y);
- p++;
- }
- }
- }
- int main()
- {
- int a, b;
- scanf("%d %d", &n, &r);
- for(int i = 0; i < r; i++)
- {
- scanf("%d %d", &a, &b);
- c[a][b] = 1;
- c[b][a] = 1;
- }
- f(1);
- printf("%d", p);
- return 0;
- }
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