Cod sursa(job #3368045)

Utilizator matei__bBenchea Matei matei__b Data 13 octombrie 2026 10:10:14
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.94 kb
// https://www.infoarena.ro/problema/bfs

#include <bits/stdc++.h>
using namespace std;

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

const int NMAX=1e5+8;

int n,m,s;
vector<int> g[NMAX];
int dist[NMAX];

void bfs(int src) {
    for(int i=1; i<=n; i++) {
        dist[i]=INT_MAX;
    }

    queue<int> q;

    q.push(src);
    dist[src]=0;

    while(!q.empty()) {
        int nod=q.front();
        q.pop();

        for(const auto &vec:g[nod]) {
            if(dist[vec]>dist[nod]+1) {
                dist[vec]=1+dist[nod];
                q.push(vec);
            }
        }
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    fin.tie(nullptr);
    fout.tie(nullptr);

    fin >> n >> m >> s;
    for(int i=1; i<=m; i++) {
        int x,y;
        fin >> x >> y;
        g[x].push_back(y);
    }
    bfs(s);

    for(int i=1; i<=n; i++) {
        fout << (dist[i]==INT_MAX ? -1 : dist[i]) << " ";
    }
    fout << "\n";

    return 0;
}