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Cod sursa(job #998196)
#include <cstdio>
#include <vector>
#include <queue>
#define NMAX 100005
#define pb push_back
using namespace std;
int n, m, start;
typedef vector <int> vi;
vi A[NMAX];
int main()
{
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
scanf("%d%d%d", &n, &m, &start);
int i, x, y;
for (i = 1; i <= m; i++)
{
scanf("%d%d", &x, &y);
A[x].pb(y);
}
vi d(n + 1, NMAX);
d[start] = 0;
queue <int> Q;
Q.push(start);
while (!Q.empty())
{
x = Q.front();
Q.pop();
for (i = 0; i < (int)A[x].size(); i++)
{
y = A[x][i];
if (d[y] > d[x] + 1)
{
d[y] = d[x] + 1;
Q.push(y);
}
}
}
for (i = 1; i <= n; i++)
if (d[i] == NMAX)
printf("-1 ");
else
printf("%d ", d[i]);
printf("\n");
return 0;
}