Cod sursa(job #2545282)

Utilizator AlexAlAxAxelAlAx AlAx AlexAlAxAxel Data 12 februarie 2020 22:56:07
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");

const int nlim=100001;
int n,m,S;
int viz[nlim];
vector <int> muchii[nlim];
queue <int> coada;

void BFS()
{
    int nod,vecin;
    while(!coada.empty())
    {
        nod=coada.front();
        coada.pop();
        for(int i=0;i<muchii[nod].size();i++)
        {
            vecin=muchii[nod][i];
            if(viz[vecin]==0)
            {
                viz[vecin]=viz[nod]+1;
                coada.push(vecin);
            }
        }
    }
}

void citire()
{
    f>>n>>m>>S;
    int x,y;
    for(int i=1;i<=m;i++)
    {
        f>>x>>y;
        muchii[x].push_back(y);
    }
    coada.push(S);
    viz[S]=1;
}

int main()
{
    citire();
    BFS();
    for(int i=1;i<=n;i++)
        g<<viz[i]-1<<" ";
    return 0;
}