Mai intai trebuie sa te autentifici.
Cod sursa(job #1794325)
Utilizator | Data | 1 noiembrie 2016 10:44:20 | |
---|---|---|---|
Problema | BFS - Parcurgere in latime | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.79 kb |
#include <iostream> // practice source
#include <fstream>
#include <vector>
#define MAXN 100005
using namespace std;
ifstream fin ("bfs.in");
ofstream fout ("bfs.out");
int n, m, l, st;
vector<int> a[MAXN];
int g[MAXN], s[MAXN], cost[MAXN];
void bfs (int nod)
{
for (int i = 1; i <= n; ++i){
cost[i] = -1;
}
l = 1;
cost[nod] = 0;
s[l] = nod;
for (int i = 1; i <= l; ++i) {
for (int j = 0; j < g[s[i]]; ++j) {
if (cost[a[s[i]][j]] == -1) {
s[++l] = a[s[i]][j];
cost[s[l]] = cost[s[i]] + 1;
}
}
}
}
int main ()
{
int x, y;
fin >> n >> m >> st;
for (int i = 1; i <= m; ++i) {
fin >> x >> y;
a[x].push_back(y);
}
for (int i = 1; i <= n; ++i) {
g[i] = a[i].size();
}
bfs(st);
for (int i = 1; i <= n; ++i) {
fout << cost[i] << " ";
}
return 0;
}