Cod sursa(job #2795285)

Utilizator Iulia25Hosu Iulia Iulia25 Data 6 noiembrie 2021 10:40:55
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.72 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
vector<int> v[100007];
queue<int> q;
int viz[100007];
int pas[100007];
int main()  {
    int n,m,x,y,k,p,s;
    f>>n>>m>>s;
    for(int i=0;i<m;i++){
        f>>x>>y;
        v[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
        pas[i]=-1;
    pas[s]=0;
    q.push(s);
    viz[s]=1;
    while(!q.empty()){
        p=q.front();
        q.pop();
        for(int vecin : v[p])
            if(!viz[vecin]){
                pas[vecin]=pas[p]+1;
                q.push(vecin);
                viz[vecin]=1;
            }
    }
    for(int i=1;i<=n;i++)
        g<<pas[i]<<' ';
    return 0;
}