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Cod sursa(job #705053)
#include<cstdio>
#include<vector>
#include<queue>
using namespace std;
vector<int> a[100100];
int d[100100];
queue<int> q;
void lee(int s, int n)
{
int x,y;
q.push(s);
for(int i=1;i<=n;i++)
d[i]=-1;
d[s]=0;
while(!q.empty())
{
x=q.front();
q.pop();
for(int i=0;i<=a[x].size();i++)
{
y=a[x][i];
if(d[y]==-1)
{
q.push(y);
d[y]=1+d[x];
}
}
}
}
int main()
{
int n,m,s,x,y;
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&n,&m,&s);
for(int i=1;i<=m;i++)
{
scanf("%d%d",&x,&y);
a[x].push_back(y);
}
lee(s,n);
for(int i=1;i<=n;i++)
printf("%d ",d[i]);
return 0;
}