Cod sursa(job #3368581)

Utilizator Andreea345Vaduva Andreea Andreea345 Data 15 octombrie 2026 08:46:34
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.86 kb
#include <bits/stdc++.h>
using namespace std;

ifstream fin("bfs.in");
ofstream fout("bfs.out");

int n, m, s;
const int NMAX = 1e5;
const int INF = 1e9;
vector<int> L[NMAX + 1];
int d[NMAX + 1];

void bfs(int sursa) {
    for (int i = 1; i <= n; ++i) {
        d[i] = INF;
    }
    d[sursa] = 0;
    queue<int> q;
    q.push(sursa);
    while (!q.empty()) {
        int node = q.front();
        q.pop();
        for (auto vec : L[node]) {
            if (d[vec] == INF) {
                d[vec] = d[node] + 1;
                q.push(vec);
            }
        }
    }
}

int main() {
    fin >> n >> m >> s;
    for (int i = 1; i <= m; ++i) {
        int x, y;
        fin >> x >> y;
        L[x].push_back(y);
    }
    bfs(s);
    for (int i = 1; i <= n; ++i) {
        if (d[i] == INF) {
            d[i] = -1;
        }
        fout << d[i] << " ";
    }
    return 0;
}