Cod sursa(job #3317788)

Utilizator staR.cChira Jurj Miruna staR.c Data 25 octombrie 2025 13:06:14
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.83 kb
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream cin("bfs.in");
ofstream cout("bfs.out");
const int NMax=100000;
vector<int> V;
vector<int> G[NMax+3];
queue<int>Q;
int N, M,S;
int D[NMax+3];
bool Use[NMax+3];
void Read(){
    cin>>N>>M>>S;
    for(int i=1; i<=M; ++i){
        int x, y;
        cin>>x>>y;
        G[x].push_back(y);
    }
}

void BFS(int Start){
    for(int i=1; i<=N; ++i){
        D[i]=-1;
    }
    Q.push(Start); D[Start]=0;
    while(!Q.empty()){
        int Nod=Q.front(); Q.pop();
        for(auto Vecin : G[Nod]){
            if(D[Vecin]==-1){
                D[Vecin]=D[Nod]+1;
                Q.push(Vecin);
            }
        }

    }
}

int main(){
    Read();
    BFS(S);
    for(int i=1; i<=N; i++){
        cout<< D[i]<<' ';
    }
}