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Cod sursa(job #501894)
#include <iostream>
#include <string>
#include <vector>
#include <queue>
using namespace std;
#define NM 100005
#define inf 1000000000
int N, M, S, dmin[NM];
vector <int> G[NM];
bool viz[NM];
int main()
{
freopen ("bfs.in", "r", stdin);
freopen ("bfs.out", "w", stdout);
scanf ("%d %d %d", &N, &M, &S);
for (int i = 1; i <= M; ++i)
{
int a, b;
scanf ("%d %d", &a, &b);
G[a].push_back(b);
}
queue <int> Q;
for (int i = 1; i <= N; ++i) dmin[i] = inf;
dmin[S] = 0;
Q.push(S);
viz[S] = 1;
while (!Q.empty())
{
int nod = Q.front();
Q.pop();
for (int i = 0; i < G[nod].size(); ++i)
{
int nnod = G[nod][i];
if (viz[nnod]) continue;
dmin[nnod] = dmin[nod] + 1;
Q.push(nnod);
viz[nnod] = 1;
}
}
for (int i = 1; i <= N; ++i)
if (!viz[i]) printf ("-1 ");
else printf ("%d ", dmin[i]);
return 0;
}