Cod sursa(job #2463465)

Utilizator andrei_044Andrei Constantin andrei_044 Data 28 septembrie 2019 11:54:59
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.92 kb
#include<bits/stdc++.h>
#define maxn 100005
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n,m,s;
int d[maxn],viz[maxn];
vector<int> lista[maxn];

queue<int> q;

void citire()
{
    fin>>n>>m>>s;
    int x,y;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y;
        lista[x].push_back(y);
    }

}


void bfs(int node)
{
    q.push(node);
    viz[node]=1;

    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        for(int i=0;i<lista[nod].size();i++)
        {
            if(!viz[lista[nod][i]])
            {
                q.push(lista[nod][i]);
                viz[lista[nod][i]]=1;
                d[lista[nod][i]]=d[nod]+1;
            }
        }

    }
}

int main()
{
    citire();
    bfs(s);
    for(int i=1;i<=n;i++)
    {
        if(viz[i])
            fout<<d[i]<<' ';
        else
            fout<<-1<<' ';
    }

}