Cod sursa(job #1937302)

Utilizator GhostWalkingPredoaica MIhai GhostWalking Data 23 martie 2017 21:06:16
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.06 kb
#include <iostream>
#include <queue>
#include <vector>
#include <fstream>
#define Nrmax 100005


using namespace std;

vector<int> graf[Nrmax];
int level[Nrmax];
bool viz[Nrmax];
queue<int>q;


void BFS(int s)
{
    int nod, len,vecin;
    level[s]=0;
    q.push(s);
    viz[s]=true;
    while(!q.empty())
    {
        nod=q.front();
        q.pop();
        len = graf[nod].size();
        for(int i=0;i<len;i++)
        {
            vecin = graf[nod][i];
            if(!viz[vecin])
            {
                viz[vecin]= true;
                q.push(vecin);
                level[vecin]=level[nod]+1;
            }
        }

    }
}

int main()
{

    int N,M,S,vecin,nod;
    ifstream fin("bfs.in");
    ofstream fout("bfs.out");
    fin>>N>>M>>S;
    for(int i=1;i<=M;i++)
    {
        fin>>nod>>vecin;
        graf[nod].push_back(vecin);
    }
    for(int i=1;i<=N;i++)
    {
        viz[i]=false;
        level[i]=-1;
    }
    BFS(S);
    for(int i=1;i<=N;i++)
        fout<<level[i]<<" ";
    return 0;
}