Cod sursa(job #2002884)

Utilizator rexlcdTenea Mihai rexlcd Data 21 iulie 2017 09:32:05
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.83 kb
#include <iostream>
#include <fstream>
#include <cstring>
#include <queue>
#include <vector>

using namespace std;

int cost[100002];
queue < int > q;
vector < int > v[100002];

int main()
{
    ifstream f("bfs.in");
    ofstream g("bfs.out");
    int n,m,s;
    f>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        int x,y; f>>x>>y;
        v[x].push_back(y);
    }

    memset(cost,-1,sizeof(cost));
    cost[s]=0;
    q.push(s);
    while(!q.empty())
    {
        int vf=q.front();
        q.pop();
        for(int i=0;i<v[vf].size();i++)
            if(cost[v[vf][i]]==-1)
            {
                q.push(v[vf][i]);
                cost[v[vf][i]]=cost[vf]+1;
            }
    }

    for(int i=1;i<=n;i++)
        g<<cost[i]<<" ";
    g<<'\n';
    f.close();
    g.close();
    return 0;
}