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Cod sursa(job #631826)
#include<stdio.h>
#include<string.h>
#include<vector>
using namespace std;
int sol[100001],S;
vector<int> a[100001],Q;
vector<int>::iterator it;
void BF()
{
int i;
memset(sol,-1,sizeof(sol));
Q.push_back(S);
sol[S]=0;
i=0;
while (i!=Q.size())
{
for (it=a[Q[i]].begin();it!=a[Q[i]].end();++it)
if (sol[*it]==-1)
{
Q.push_back(*it);
sol[*it]=sol[Q[i]]+1;
}
++i;
}
}
int main()
{
int N,M,i,x,y;
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]);
}