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Cod sursa(job #639842)
#include <stdio.h>
#include <vector>
#define max 100000
using namespace std;
vector <int> muchii[max];
int viz[max];
int m,n,s;
void bf(int s)
{
vector <int> coada;
coada.push_back(s);
for(int i=1;i<=n;i++)
viz[i]=-1;
viz[s]=0;
int p=0;
while(p<coada.size())
{
int x=coada[p];
int v=muchii[x].size();
for(int j=0;j<v;j++)
{
if(viz[muchii[x][j]]==-1)
{coada.push_back(muchii[x][j]);
viz[muchii[x][j]]=viz[x]+1;}
}
p++;
}
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&n,&m,&s);
for(int i=1;i<=m;i++)
{
int x,y;
scanf("%d%d",&x,&y);
muchii[x].push_back(y);
}
bf(s);
for(int i=1;i<=n;i++)
printf("%d ",viz[i]);
return 0;
}