Cod sursa(job #3005145)

Utilizator Stefan314159Stefan Bisti Stefan314159 Data 16 martie 2023 19:44:23
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.81 kb
#include <iostream>
#include <vector>
#include <queue>
#include <fstream>
using namespace std;

#define N 100001

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

vector<int> a[N];
int d[N], viz[N];
queue<int> q;

void bfs(int start){
    q.push(start);
    d[start] = 0;
    while(q.empty() == false){
        int nod = q.front();
        q.pop();

        for(int k : a[nod]){
            if(d[k] == -1){
                d[k] = 1 + d[nod];
                q.push(k);
            }
        }
    }
}

int main(){
    int n, m, k;
    in >> n >> m >> k;
    for(int i=1; i<=m; i++){
        int x, y;
        in >> x >> y;
        a[x].push_back(y);
    }



    for(int i=1; i<=n; i++)
        d[i] = -1;

    bfs(k);

    for(int i=1; i<=n; i++)
        out << d[i] << ' ';
}