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Cod sursa(job #825370)
#include <fstream>
#include <queue>
#include <vector>
#define N 1<<17
using namespace std;
const char iname[] = "bfs.in";
const char oname[] = "bfs.out";
ifstream fin(iname);
ofstream fout(oname);
int n , m , s , i , j , x , y;
int cost[ N ];
vector <int> v[ N ];
queue <int> Q;
int main()
{
fin >> n >> m >> s;
for ( i = 1; i <= n; ++i ) cost[ i ] = N;
for ( i = 1; i <= m; ++i )
{
fin >> x >> y;
v[ x ].push_back( y );
}
cost[ s ] = 0;
Q.push( s );
while( !Q.empty() )
{
x = Q.front();
Q.pop();
for ( i = 0; i < v[ x ].size(); ++i )
{
if ( cost[ x ] + 1 < cost[ v[ x ][ i ] ] )
{
cost[ v[ x ][ i ] ] = cost[ x ] + 1;
Q.push( v[ x ][ i ] );
}
}
}
for ( i = 1; i <= n; ++i )
if ( cost[ i ] == N ) fout << -1 << ' ';
else
fout << cost[ i ] << ' ';
fout << '\n';
return 0;
}