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Cod sursa(job #844123)
#include <queue>
#include <map>
#include <vector>
#include <cstring>
#include <cstdio>
using namespace std;
int main()
{
int n, m, s, i, x, y;
map<int, vector<int> > g;
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
scanf("%d %d %d", &n, &m, &s);
for (i = 0; i < m; i++) {
scanf("%d %d", &x, &y);
g[x].push_back(y);
}
int t, itv, cost[n + 1];
queue<int> Q;
vector<int>::iterator endit, it;
memset(cost, -1, sizeof(cost));
Q.push(s);
cost[s] = 0;
while (!Q.empty()) {
t = Q.front();
Q.pop();
for (it = g[t].begin(), endit = g[t].end(); it != endit; ++it) {
itv = *it;
if (cost[itv] == -1) {
Q.push(itv);
cost[itv] = cost[t] + 1;
}
}
}
for (i = 1; i <= n; i++) {
printf("%d ", cost[i]);
}
return 0;
}