Cod sursa(job #2111338)

Utilizator dumitru123Patularu Mihai dumitru123 Data 21 ianuarie 2018 21:21:39
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp Status done
Runda Arhiva educationala Marime 0.77 kb
#include <fstream>
#include <vector>
#include <climits>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
#define nmax 100003
int n,m,x,y,start;
int viz[nmax];
vector < int > v[nmax];
vector < int > solutie;
void DFS(int nod)
{
    for(vector < int >::iterator it=v[nod].begin(); it!=v[nod].end(); it++)
        if(viz[*it]>viz[nod]+1)
        {
            viz[*it]=viz[nod]+1;
            DFS(*it);
        }
}
int main()
{
    f>>n>>m>>start;
    for(int i=1; i<=m; i++)
    {
        f>>x>>y;
        v[x].push_back(y);
    }
    for(int i=1; i<=n; i++)
        viz[i]=INT_MAX;
    viz[start]=0;
    DFS(start);
    for(int i=1; i<=n; i++)
        if(viz[i]==INT_MAX) g<<"-1"<<" ";
        else g<<viz[i]<<" ";
    return 0;
}