Cod sursa(job #3314625)

Utilizator andrei65tAndrei Popescu-Ilioniu andrei65t Data 10 octombrie 2025 15:23:56
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.85 kb
#include <bits/stdc++.h>
using namespace std;
vector<int> L[100005];

ifstream fin("bfs.in");
ofstream fout("bfs.out");
int d[100005];
int n, m, s;
void bfs(int s){
    queue<int> Q;
    for(int i=1;i<=n;i++)
        d[i]=1e9;
    d[s]=0;
    Q.push(s);
    while(!Q.empty()){
        int nod = Q.front();
        Q.pop();
        for(int i=0;i<L[nod].size();i++){
            int vecin = L[nod][i];
            if(d[vecin]>d[nod]+1)
            {
                d[vecin]=d[nod]+1;
                Q.push(vecin);
            }
        }
    }
}
int main() {
    fin >> n >> m >> s;
    for(int i=0;i<m;i++){
        int a,b;
        fin >> a >> b;
        L[a].push_back(b);
    }
    bfs(s);
    for(int i = 1; i <= n; i++) {
        if(d[i] == 1e9) {
            fout << -1 << ' ';
        } else {
            fout << d[i] << ' ';
        }
    }
    return 0;
}