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Cod sursa(job #700729)
#include<fstream>
#include<cstdio>
#include<vector>
#include<queue>
using namespace std;
const int MaxN = 100001;
const char InFile[] = "bfs.in";
const char OutFile[] = "bfs.out";
int N,M,S,viz[MaxN];
vector<int> G[MaxN];
queue<int> Q;
void BFS()
{
int nod;
vector<int>::iterator it;
for( nod = 1 ; nod <= N ; ++nod )
viz[nod] = -1;
viz[S] = 0;
Q.push(S);
while( !Q.empty() )
{
nod = Q.front();
Q.pop();
for( it = G[nod].begin() ; it != G[nod].end() ; ++it )
if( viz[*it] == -1 )
{
Q.push(*it);
viz[*it] = viz[nod] + 1;
}
}
}
int main()
{
ifstream fin( InFile );
ofstream fout( OutFile );
fin >> N >> M >> S;
int i,x,y;
for( i = 0 ; i < M ; ++i )
{
fin >> x >> y;
G[x].push_back(y);
}
BFS();
for( i = 1 ; i <= N ; i++ )
fout << viz[i] << ' ';
fout << '\n';
fin.close();
fout.close();
return 0;
}