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Cod sursa(job #663614)
#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";
#define pb push_back
int n,m,S,cost[MaxN];
bool viz[MaxN];
vector<int> G[MaxN];
queue<int> Q;
void BFS()
{
int nod;
vector<int>::iterator it,iend;
cost[S] = 0;
Q.push(S);
viz[S] = 1;
while( !Q.empty() )
{
nod = Q.front();
Q.pop();
iend = G[nod].end();
for( it = G[nod].begin() ; it != iend ; ++it )
if( !viz[*it] )
{
viz[*it] = 1;
cost[*it] = cost[nod] + 1;
Q.push(*it);
}
}
}
int main()
{
int i,x,y;
ifstream fin( InFile );
ofstream fout( OutFile );
fin >> n >> m >> S;
for( int i = 0 ; i < m ; i++ )
{
fin >> x >> y;
G[x].pb(y);
}
for( i = 1 ; i <= n ; i++ )
cost[i] = -1;
BFS();
for( i = 1 ; i <= n ; i++ )
fout << cost[i] << ' ';
fout << '\n';
return 0;
}