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Cod sursa(job #575796)
#include<stdio.h>
long p, i, u, N, M, X, x, y, z, a[15000][15000], viz[150000], c[150000];
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%ld %ld %ld", &N, &M, &X);
for (i = 1; i <= M; i ++)
{
scanf("%ld %ld", &x, &y);
a[x][y] = 1;
}
p = u = 1;
c[1] = X;
viz[X] = 1;
while (p <= u)
{
z = c[p];
p ++;
for (i = 1; i <= N; i ++)
if (a[z][i] == 1 && viz[i] == 0)
{
u ++;
c[u] = i;
viz[i] = viz[z] + 1;
}
}
for (i = 1; i <= N; i ++)
if (i == X) printf("0 ");
else printf("%ld ", viz[i] - 1);
printf("\n");
return 0;
}