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Cod sursa(job #631823)
#include<stdio.h>
#include<string.h>
#include<vector>
using namespace std;
int N,M,i,S,x,y,nod,sol[100001];
vector<int> a[100001],Q;
vector<int>::iterator it;
void BF()
{
memset(sol,-1,sizeof(sol));
Q.push_back(S);
sol[S]=0;
i=0;
while (i!=Q.size())
{
nod=Q[i];
for (it=a[nod].begin();it!=a[nod].end();it++)
if (sol[*it]==-1)
{
Q.push_back(*it);
sol[*it]=sol[nod]+1;
}
i++;
}
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&N,&M,&S);
for (i=1;i<=M;i++)
{
scanf("%d%d",&x,&y);
a[x].push_back(y);
}
BF();
for (i=1;i<=N;i++)
printf("%d ",sol[i]);
}