Pagini recente » Profil forever16 | Cod sursa (job #3281653) | Cod sursa (job #471133) | Cod sursa (job #781140) | Cod sursa (job #672914)
Cod sursa(job #672914)
#include <queue>
#include <vector>
#include <fstream>
#include <cstdlib>
#define N_MAX 100011
#define oo 1<<30
using namespace std;
int d[N_MAX];
queue< int > Q;
vector< int > G[N_MAX];
vector< int >::const_iterator it, iend;
int main()
{
int N, M, S, x, y, i;
ifstream in( "bfs.in" );
ofstream out( "bfs.out" );
for( in>>N>>M>>S; M; --M )
{
in>>x>>y;
G[x].push_back( y );
}
for( i=1; i <= N; ++i )
d[i]=-1;
d[S]=0;
for( Q.push(S); !Q.empty(); Q.pop() )
{
x=Q.front();
for( it=G[x].begin(), iend=G[x].end(); it < iend; ++it )
if( -1 == d[*it] )
{
d[*it]=d[x]+1;
Q.push( *it );
}
}
for( i=1; i <= N; ++i )
out<<d[i]<<' ';
out<<'\n';
return EXIT_SUCCESS;
}