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Cod sursa(job #874414)
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <vector>
#include <queue>
using namespace std;
#define PB push_back
#define maxN 100010
#define inf (1 << 30)
int Cost[maxN], N;
queue <int> Q;
vector <int> List[maxN];
void BFS (int nod)
{
for (int i = 1; i <= N; ++ i) Cost[i] = inf;
Cost[nod] = 0;
Q.push (nod);
while (! Q.empty ())
{
int nod2 = Q.front();
Q.pop ();
for (int i = 0; i < List[nod2].size(); ++ i)
{
int newnod = List[nod2][i];
if (Cost[newnod] != inf) continue;
Cost[newnod] = Cost[nod2] + 1;
Q.push (newnod);
}
}
}
int main()
{
freopen ("bfs.in", "r", stdin);
freopen ("bfs.out", "w", stdout);
int M, S;
scanf ("%d %d %d", &N, &M, &S);
while (M --)
{
int x, y;
scanf ("%d %d", &x, &y);
List[x].PB (y);
}
BFS (S);
for (int i = 1; i <= N; ++ i) if (Cost[i] == inf) printf ("-1 ");
else printf ("%d ", Cost[i]);
return 0;
}