Pagini recente » Cod sursa (job #3313485) | Cod sursa (job #3313068) | Cod sursa (job #3313064) | Cod sursa (job #3314699) | Cod sursa (job #3313569)
#include <bits/stdc++.h>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n, m, s;
vector <int> G[1000001];
int dist[100001];
queue <int> q;
void BFS(int nod)
{
int i, curr;
for (i = 1 ; i <= n ; i++)
dist[i] = 2e9;
q.push(nod);
dist[nod] = 0;
while (!q.empty())
{
curr = q.front();
q.pop();
for (auto next : G[curr])
if (dist[next] > dist[curr] + 1)
{
dist[next] = dist[curr] + 1;
q.push(next);
}
}
}
int main()
{
int x, y, i;
fin >> n >> m >> s;
for (i = 1 ; i <= m ; i++)
{
fin >> x >> y;
G[x].push_back(y);
}
BFS(s);
for (i = 1 ; i <= n ; i++)
{
if (dist[i] == 2e9)
fout << -1 << " ";
else
fout << dist[i] << " ";
}
return 0;
}