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Cod sursa(job #929750)
#include<stdio.h>
#include<string.h>
#include<vector>
#include<queue>
using namespace std;
queue <int> q;
vector <int> v[100001];
int viz[100001] , n , m , pozi , x , y;
void bfs(int x)
{
memset(viz , -1 , sizeof(viz));
viz[x]=0;
q.push(x);
while(! q.empty())
{
int temp=q.front();
for(int i=0 ; i<v[temp].size() ; ++i)
if(viz[v[temp][i]] == -1)
{
viz[v[temp][i]]=viz[temp]+1;
q.push(v[temp][i]);
}
q.pop();
}
}
int main()
{
freopen("bfs.in" , "r" , stdin);
freopen("bfs.out" , "w" , stdout);
scanf("%d %d %d" , &n , &m , &pozi);
for ( ; m>0 ; --m)
{
scanf("%d %d" , &x , &y);
v[x].push_back(y);
}
bfs(pozi);
for(int i=1 ; i<=n ; ++i)
printf("%d " , viz[i]);
printf("\n");
}