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Cod sursa(job #844163)
#include <cstring>
#include <vector>
#include <cstdio>
using namespace std;
#define N 100000
int l[N + 1], cost[N + 1], q[N];
vector<int> g[N + 1];
int main () {
int n, m, s, i, x, y, t, itv, p = 0, u = 0;
FILE *in = fopen("bfs.in", "r");
fscanf(in, "%d %d %d", &n, &m, &s);
memset(l, 0, sizeof(l));
memset(cost, -1, sizeof(cost));
cost[s] = 0;
q[0] = s;
for (i = 0; i < m; i++) {
fscanf(in, "%d %d", &x, &y);
g[x].push_back(y);
}
fclose(in);
for (i = 1; i <= n; i++) {
l[i] = g[i].size();
}
while (u >= p) {
t = q[p];
p++;
for (i = 0; i < l[t]; i++) {
itv = g[t][i];
if (cost[itv] == -1) {
q[++u] = itv;
cost[itv] = cost[t] + 1;
}
}
}
FILE *out = fopen("bfs.out", "w");
for (i = 1; i <= n; i++) {
fprintf(out, "%d ", cost[i]);
}
fclose(out);
return 0;
}