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Cod sursa(job #673870)
#include <fstream>
#include <string.h>
#include <vector>
#include <deque>
#define Nmax 100009
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int nod,x,y,n,m,s,nr[Nmax];
vector < int > a[Nmax];
deque < int > Q;
vector < int >::iterator it;
void BFS()
{Q.push_back(s);
while (!Q.empty())
{nod=Q.front();
Q.pop_front();
for (it=a[nod].begin();it!=a[nod].end();it++)
if (nr[*it]==-1) {nr[*it]=nr[nod]+1;
Q.push_back(*it);
}
}
}
int main()
{f>>n>>m>>s;
for (register int i=1;i<=m;++i)
{f>>x>>y;
a[x].push_back(y);
}
memset(nr,-1,sizeof(nr));
nr[s]=0;
BFS();
for (register int i=1;i<=n;++i)g<<nr[i]<<" ";
g<<'\n';
return false;
}