Cod sursa(job #1323510)

Utilizator andreismara97Smarandoiu Andrei andreismara97 Data 21 ianuarie 2015 09:44:59
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.87 kb
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");

#define Nmax 100005

vector <int> lista[Nmax];
queue  <int> coada;
int N, M, Start;
int ct[Nmax]={0};

void Bfs(int nod)
{
    coada.push(nod);

    ct[nod]=1;

    while(!coada.empty())
    {
        int st=coada.front();
        coada.pop();

        for(int i=0; i < lista[ st ].size(); i++)
        {
            if(ct[ lista[ st ][i] ] == 0)
            {
                coada.push( lista[st][i]);
                ct[lista[st][i]] = ct[st]+1;
            }
        }
    }
}

int main ()
{

    int x, y;

    in>>N>>M>>Start;

    for(int i=1; i<=M; i++)
    {
        in>>x>>y;
        lista[x].push_back(y);
    }

    Bfs( Start);

    for(int i=1; i<=N; i++)
        out<<ct[i]-1<<' ';
    return 0;
}