Cod sursa(job #3263728)

Utilizator ruxandra2006Tataru Ruxandra ruxandra2006 Data 16 decembrie 2024 11:28:55
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.84 kb
#include <fstream>
#include <vector>
#define NMAX 100002
using namespace std;
ifstream fin("BFS.in");
ofstream fout("BFS.out");
int n, m, start;
int c[NMAX];
vector<int> a[NMAX];
int viz[NMAX];
int inc,sf;
void bfs(int x);
void citire();
int main()
{
    int i;
    citire();
    bfs(start);
    for(i=1;i<=n;i++)
        fout<<viz[i]-1<<' ';
    fout.close();
    return 0;
}

void citire()
{
    int i,x,y;
    fin>>n>>m>>start;
    for(i=0; i<m; i++)
    {
        fin>>x>>y;
        a[x].push_back(y);
    }
}

void bfs(int x)
{
    int i;
    viz[x]=1;
    c[1]=x;
    inc=sf=1;
    while(inc<=sf)
    {
        x=c[inc++];
        for(i=0; i<a[x].size(); i++)
            if(!viz[a[x][i]])
            {
                viz[a[x][i]]=1+viz[x];
                c[++sf]=a[x][i];
            }

    }
}