Cod sursa(job #3199982)

Utilizator charlie1983Iscru Daria charlie1983 Data 3 februarie 2024 10:21:29
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> q;
int dist[200005];

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

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;
}