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Cod sursa(job #828762)
#include <fstream>
#include <list>
#include <queue>
#include <stdio.h>
#include <string.h>
using namespace std;
#define MAXN 100001
vector<int> nodes[MAXN];
int dist[MAXN];
int main() {
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
int n, m, s;
scanf("%d %d %d", &n, &m, &s);
memset(dist, -1, sizeof(dist));
for (int i = 0; i < m; i++) {
int source, dest;
scanf("%d %d", &source, &dest);
nodes[source].push_back(dest);
}
list<int> queue;
dist[s] = 0;
queue.push_front(s);
while (!queue.empty()) {
int head = queue.front(); queue.pop_front();
vector<int>::iterator it;
for (it = nodes[head].begin(); it != nodes[head].end(); it++) {
if (dist[*it] == -1){
dist[*it] = dist[head] + 1;
queue.push_back(*it);
}
}
}
for (int i = 1; i < n; i++ ) {
printf("%d ", dist[i]);
}
printf("%d", dist[n]);
}