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Cod sursa(job #341384)
#include <iostream>
#include <queue>
#include <vector>
using namespace std;
int N;
vector< vector<int> > G;
vector<int> custo;
void bfs(int start) {
queue<int> q;
q.push(start);
custo = vector<int>(N, -1);
custo[start] = 0;
while (!q.empty()) {
int v = q.front();
q.pop();
for (vector<int>::iterator it = G[v].begin();
it != G[v].end(); it++) {
if (custo[*it] == -1) {
custo[*it] = custo[v] + 1;
q.push(*it);
}
}
}
}
main() {
int n, m, s, i;
int x, y;
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
scanf("%d%d%d", &n, &m, &s);
N = n + 1;
G = vector< vector<int> >(N, vector<int>());
for (i = 0; i < m; i++) {
scanf("%d%d", &x, &y);
G[x].push_back(y);
}
bfs(s);
printf("%d", custo[1]);
for (i = 2; i <= n; i++) {
printf(" %d", custo[i]);
}
//printf("\n");
}