Pagini recente » Cod sursa (job #1868691) | Cod sursa (job #3233917) | Cod sursa (job #654209) | Cod sursa (job #1667998) | Cod sursa (job #2604855)
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int d[100005], n, m, S, i, x, y;
bool viz[100005];
vector <int> v[100005];
queue <int> Q;
void bfs() {
Q.push(S);
viz[S] = 1;
d[S] = 0;
while(!Q.empty()) {
int k = Q.front();
Q.pop();
for(vector <int> :: iterator i = v[k].begin(); i != v[k].end(); ++i) {
if(!viz[*i]) {
Q.push(*i);
d[*i] = d[k] + 1;
viz[*i] = 1;
}
}
}
}
int main() {
f >> n >> m >> S;
for(i = 1; i <= m; ++ i) {
f >> x >> y;
v[x].push_back(y);
}
for(i = 1; i <= n; ++ i)
d[i] = -1;
bfs();
for(i = 1; i <= n; ++ i)
g << d[i] << " ";
return 0;
}