Pagini recente » Cod sursa (job #2743271) | Cod sursa (job #3204123) | Cod sursa (job #1436637) | Cod sursa (job #2279693) | Cod sursa (job #2193744)
#include <bits/stdc++.h>
using namespace std;
ifstream f ("bfs.in");
ofstream g ("bfs.out");
bool a[100001];
int n,m,S,i,x,y,lg[100001];
vector <int> G[100001];
queue <int> Q;
void bfs (int nod)
{
vector <int> :: iterator it;
a[nod] = true;
lg[nod] = 0;
Q.push(nod);
while (!Q.empty())
{
x = Q.front();
for (it = G[x].begin(); it != G[x].end(); it++)
{
if (!a[*it])
{
Q.push(*it);
a[*it] = true;
lg[*it] = lg[x] + 1;
}
}
Q.pop();
}
}
int main()
{
f >> n >> m >> S;
for (i = 1; i <= m; i++)
{
f >> x >> y;
G[x].push_back(y);
}
bfs(S);
for (i = 1; i <= n; i++)
{
if (!a[i]) g << -1 << " ";
else g << lg[i] << " ";
}
return 0;
}