Cod sursa(job #3306744)

Utilizator pkseVlad Bondoc pkse Data 13 august 2025 14:20:53
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.87 kb
#include <iostream>
#include <vector>
#include <queue>
using namespace std;

vector<int> a[100005];
int ans[100005];

void bfs(int k) {
    queue<int> q;
    q.push(k);
    while(q.size()) {
        for(auto i : a[q.front()]) {
            if(ans[i] == -1) {
                ans[i] = ans[q.front()] + 1;
                q.push(i);
            }
            
        }
        q.pop();
    }
}

int main() {
    freopen("bfs.in", "r", stdin);
    freopen("bfs.out", "w", stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n, m, k; cin >> n >> m >> k;
    for(int i = 1; i <= m; i ++) {
        int x, y; cin >> x >> y;
        a[x].push_back(y);
    }

    for(int i = 1; i <= n; i ++) {
        ans[i] = -1;
    }
    ans[k] = 0;
    bfs(k);
    for(int i = 1; i <= n; i ++) {
        cout << ans[i] << ' ';
    }
}