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Cod sursa(job #809249)
#include <cstdio>
#include <cstring>
using namespace std;
inline int next_int() {
int d;
scanf("%d", &d);
return d;
}
const int V = 100000;
const int E = 1000000;
int f, b, Q[V + V], seen[V], d[V];
int ec, eb[V], en[E], et[E];
int main() {
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
memset(d, -1, sizeof d);
memset(eb, -1, sizeof eb);
int n = next_int();
int m = next_int();
int s = next_int() - 1;
for (int i = 0; i < m; i++) {
int u = next_int() - 1;
int v = next_int() - 1;
et[ec] = v;
en[ec] = eb[u];
eb[u] = ec++;
}
Q[b++] = s;
Q[b++] = 0;
seen[s] = true;
while (b - f > 0) {
int u = Q[f++];
int c = Q[f++];
d[u] = c;
for (int e = eb[u]; e != -1; e = en[e]) {
int v = et[e];
if (seen[v] == false) {
seen[v] = true;
Q[b++] = v;
Q[b++] = c + 1;
}
}
}
for (int i = 0; i < n; i++) {
printf("%d ", d[i]);
}
return 0;
}