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Cod sursa(job #858199)
#include <iostream>
#include <cstdio>
#include <vector>
#include <cstring>
#include <queue>
using namespace std;
#define maxN 100005
#define PB push_back
vector <int> V[maxN];
queue <int> Q;
bool viz[maxN];
int cost[maxN];
int N , M , S;
int main ()
{
freopen ("bfs.in" , "r" , stdin);
freopen ("bfs.out" , "w" , stdout);
scanf ("%d %d %d" , &N , &M , &S);
int a , b;
while (M --)
{
scanf ("%d %d" , &a , &b);
V[a].PB(b);
}
memset (cost , -1 , sizeof (cost));
Q.push(S);
cost[S] = 0;
viz[S] = true;
while (!Q.empty())
{
int root = Q.front();
Q.pop();
for (unsigned int i = 0 ; i < V[root].size() ; ++i)
{
int node = V[root][i];
if (viz[node])
continue;
viz[node] = true;
cost[node] = cost[root] + 1;
Q.push(node);
}
}
for (int i = 1 ; i <= N ; ++i)
printf ("%d " , cost[i]);
return 0;
}