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Cod sursa(job #782083)
#include<iostream>
#include<cstring>
#include<cstdio>
#include<vector>
using namespace std;
#define maxn 100005
vector <int> a[maxn];
int g[maxn],cost[maxn],l[maxn],nr[maxn],i,j,n,m,s,p,x,y;
void bfs(int nod)
{
memset(cost,-1,sizeof(cost));
cost[nod]=0;
p=1;
l[p]=nod;
for(i=1;i<=p;++i)
for(j=0;j<g[l[i]];++j)
if(cost[a[l[i]][j]] == -1)
{
l[++p]=a[l[i]][j];
cost[l[p]]=cost[l[i]]+1;
}
}
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);
}
for(i=1;i<=n;++i)
g[i]=a[i].size();
bfs(s);
for(i=1;i<=n;++i)
printf("%d ",cost[i]);
printf("\n");
return 0;
}