Cod sursa(job #2049059)

Utilizator ShadowSwangNikola Radulov ShadowSwang Data 26 octombrie 2017 20:14:16
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.93 kb
/**

*/
#include<iostream>
#include<fstream>
#include<string.h>
#include<vector>
#include<queue>

using namespace std;

ifstream fin;
ofstream fout("bfs.out");
queue <int>Q;
vector <int>G[100001];
int N,M,d[100001],X;

void Read()
{
    int x,y;
    fin.open("bfs.in");
    fin>>N>>M>>X;
    for(int i=1;i<=M;i++)
    {
        fin>>x>>y;
        G[x].push_back(y);
    }
}

void bfs(int nod)
{
    Q.push(nod);
    for(int i=1;i<=N;i++)
        d[i]=-1;
    d[nod]=0;
    while(!Q.empty())
    {
        int Nod;
        Nod=Q.front();Q.pop();
        for(int i=0;i<(int)G[Nod].size();i++)
        {
            if(d[G[Nod][i]]==-1)
            {
                d[G[Nod][i]]=d[Nod]+1;
                Q.push(G[Nod][i]);
            }
        }
    }
}
void afisare()
{
    for(int i=1;i<=N;i++)
        fout<<d[i]<<' ';
}
int main()
{
    Read();
    bfs(X);
    afisare();
    return 0;
}