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Cod sursa(job #605047)
# include <cstdio>
# include <vector>
using namespace std;
const char *FIN = "dfs.in", *FOU = "dfs.out";
const int MAX = 100005;
int N, M, sol, VIZ[MAX];
int *G[MAX];
void dfs (int S) {
VIZ[S] = 1;
for (int i = 1; i <= G[S][0]; ++i)
if (VIZ[G[S][i]] == 0)
dfs (G[S][i]);
}
int main (void) {
freopen (FIN, "r", stdin);
scanf ("%d %d", &N, &M);
for (int i = 0; i <= N; ++i)
G[i] = new int [M + 1], G[i][0] = 0;
for (int i = 1, x, y; i <= M; ++i) {
scanf ("%d %d", &x, &y);
G[x][++G[x][0]] = y;
G[y][++G[y][0]] = x;
}
for (int i = 1; i <= N; ++i)
if (VIZ[i] == 0)
++sol, dfs (i);
fprintf (fopen (FOU, "w"), "%d", sol);
}