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Cod sursa(job #301198)
#include <cstdio>
#include <list>
#include <queue>
#include <vector>
using namespace std;
#define pb push_back
int n;
vector< vector<int> > vecini;
vector<int> dist;
vector<bool> sel;
queue<int> c;
void bfs()
{
int i;
vector<int>::iterator it, sfarsit;
for (; !c.empty(); c.pop())
{
i = c.front();
sfarsit = vecini[i].end();
for (it = vecini[i].begin(); it != sfarsit; ++it)
{
if (!sel[*it])
{
sel[*it] = 1;
dist[*it] = dist[i] + 1;
c.push(*it);
}
}
}
}
int main()
{
int i, m, s, x, y;
freopen("bfs.out", "w", stdout);
freopen("bfs.in", "r", stdin);
scanf("%d%d%d", &n, &m, &s);
vecini.resize(n + 1);
dist.resize(n + 1, -1);
sel.resize(n + 1, 0);
for (i = 1; i <= m; ++i)
{
scanf("%d%d", &x, &y);
vecini[x].pb(y);
}
c.push(s);
dist[s] = 0;
sel[s] = 1;
bfs();
for (i = 1; i <= n; ++i)
{
printf("%d ", dist[i]);
}
printf("\n");
return 0;
}