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Cod sursa(job #796175)
#include<vector>
#include<string.h>
#include<cstdio>
using namespace std;
#define nmax 100001
vector <int> v[nmax];
int n,m,s,a[nmax],cost[nmax],b[nmax];
bool use[nmax];
void bfs()
{
int i,j,l=1,k=1;
for(i=0;i<l;i++)
{
for(j=0;j<v[a[i]].size();j++)
{
int nod=v[a[i]][j];
if(cost[nod]<1 && !use[nod])
{
use[nod]=1;
b[l]=b[i]+1;
cost[nod]=b[l];
a[l++]=nod;
}
}
}
}
int main()
{
int x,y,i;
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d %d %d",&n,&m,&s);
a[0]=s;
use[s]=1;
for(i=1;i<=m;i++)
{
scanf("%d %d",&x,&y);
v[x].push_back(y);
}
memset(cost,-1,nmax);
bfs();
cost[s]=0;
for(i=1;i<=n;i++)
printf("%d ",cost[i]);
return 0;
}