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Cod sursa(job #622011)
#include <iostream>
#include <stdio.h>
#include <vector>
using namespace std;
int nn,n,s,x,y,v[100100],i,j,k,a,b,u,p,c[100100];
vector<int> m[100100];
vector<int>::iterator it;
int d[1000100];
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d %d %d",&n,&nn,&s);
for (i=1;i<=nn;i++)
{
scanf("%d %d",&x,&y);
//c[x]++;
//m[(x-1)*100+c[x]]=y;
m[x].push_back(y);
}
for (i=1;i<=n;i++)
v[i]=-1;
v[s]=0;
p=0;u=1;d[1]=s;
while (p<=u)
{
d[p]=0;
p++;
//for (i=1;i<=m[x].size();i++)
for (it=m[d[p]].begin(); it<m[d[p]].end(); it++)
{
//printf("%d \n",*it);
if (v[*it]==-1)
{
u++;
d[u]=*it;
v[*it]=v[d[p]]+1;
}
}
}
for (i=1;i<=n;i++)
printf("%d ",v[i]);
return 0;
}