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Cod sursa(job #662397)
#include<fstream>
#include<algorithm>
#include<queue>
#define inf 1<<30
using namespace std;
int n,m,start,i,j,x,y,c;
vector<int> a[100001];
vector<int> d(100001,inf);
queue<int>q;
void bf(int x)
{
int i;
q.push(x);
while(!q.empty())
{
x=q.front();
q.pop();
for(i=0;i<a[x].size();++i)
if(d[a[x][i]]>d[x]+1)
{
d[a[x][i]]=d[x]+1;
q.push(a[x][i]);
}
}
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&n,&m,&start);
for(i=1;i<=m;++i)
{
scanf("%d%d",&x,&y);
a[x].push_back(y);
}
d[start]=0;
bf(start);
for(i=1;i<=n;++i)
if(d[i]!=inf)
printf("%d ",d[i]);
else
printf("-1 ");
return 0;
}