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Cod sursa(job #554913)
#include<stdio.h>
#include<vector>
#define N 1000001
using namespace std;
vector <int> a[N];
int n , x0 , d[N] , pred[N] , coada[N];
void citire()
{
int x , y , m ;
scanf("%d%d%d",&n,&m,&x0);
for(int i = 0 ; i <= m ; ++i)
{
scanf("%d%d",&x,&y);
a[x].push_back(y);
}
for(int i = 0 ; i <= N ; ++i)
d[i] = -1;
}
void bfs()
{
int p = 0 , u = 0 , x , y ;
d[x0] = 0;
coada[u++] = x0;
while(p != u)
{
x = coada[p++];
for(int i = 0 ; i < a[x].size() ; i++)
{
y = a[x][i];
if(d[y] == -1)
{
d[y] = 1 + d[x];
pred[y] = x ;
coada[u++] = y;
}
}
}
}
void afisare()
{
for(int i = 1 ; i <= n ; ++i)
printf("%d ",d[i]);
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
citire();
bfs();
afisare();
return 0;
}