Cod sursa(job #3246495)

Utilizator adimiclaus15Miclaus Adrian Stefan adimiclaus15 Data 3 octombrie 2024 14:26:52
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.78 kb
#include <bits/stdc++.h>

using namespace std;

ifstream f("bfs.in");
ofstream g("bfs.out");

const int NMAX = 1e5;
vector<int> L[NMAX + 1];
int dist[NMAX + 1];

void bfs(int x) {
    dist[x] = 0;
    queue<int> q;
    q.push(x);
    while(!q.empty()) {
        int node = q.front();
        q.pop();
        for(auto next : L[node]) {
            if(dist[next] == -1) {
                dist[next] = dist[node] + 1;
                q.push(next);
            }
        }
    }
}


int main() {
    int n, m, s;
    f >> n >> m >> s;
    for(int i = 1; i <= m; i++) {
        int x, y;
        f >> x >> y;
        L[x].push_back(y);
    }
    for(int i = 1; i <= n; i++) {
        dist[i] = -1;
    }
    bfs(s);
    for(int i = 1; i <= n; i++) {
        g << dist[i] << ' ';
    }
    return 0;
}