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Cod sursa(job #699429)
#include <cstdio>
#include <queue>
#include <vector>
#include <cstring>
using namespace std;
#define NMAX 100001
#define INF 0x3f3f3f3f
#define pb push_back
int N, M, i, x, y, Sursa;
int D[NMAX];
vector< int > G[NMAX];
bool Used[NMAX];
queue< int > Q;
int main()
{
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
scanf("%d%d%d", &N, &M, &Sursa );
for( ; M--; )
{
scanf("%d%d", &x, &y );
G[x].pb( y );
}
Q.push( Sursa );
memset( D, INF, sizeof(D) );
D[Sursa] = 0;
memset( Used, false, sizeof(Used) );
Used[Sursa] = true;
while( !Q.empty() )
{
int Nod = Q.front(); Q.pop();
for( vector< int >::iterator it = G[Nod].begin(); it != G[Nod].end(); ++it )
if( !Used[*it] )
{
Used[*it] = true;
D[*it] = D[Nod] + 1;
Q.push( *it );
}
}
for( i = 1; i <= N; ++i )
printf("%d ", ( D[i] == INF ) ? -1 : D[i] );
printf("\n");
return 0;
}