Cod sursa(job #3199978)

Utilizator AngellAnghel Stefan Angell Data 3 februarie 2024 10:16:22
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.89 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <vector<int>> graf;
queue <int> que;
int dist[200005];

void BFS(int nodst){
    dist[nodst]=1;
    que.push(nodst);
    while(!que.empty()){
        int nod = que.front();
        que.pop();
        for(int vec: graf[nod]){
            if(dist[vec]==0){
                dist[vec] = dist[nod]+1;
                que.push(vec);
            }
        }
    }

}
int main() {
    int n,m,s;
    fin>>n>>m>>s;
    graf.resize(n+1);
    for(int i=0; i<m; i++){
        int nod1, nod2;
        fin>>nod1>>nod2;
        graf[nod1].push_back(nod2);
    }

    BFS(s);
    for(int i=1; i<=n; i++){
        if(dist[i]==0 && i!=s)
            fout<<-1<<' ';
        else
            fout<<dist[i]-1<<' ';
    }
    return 0;
}