Cod sursa(job #2230927)

Utilizator Cojocaru_Andrei_CristianCojocaru Andrei Cristian Cojocaru_Andrei_Cristian Data 12 august 2018 14:48:43
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>
#include <vector>
#define NMAX 100005
#include <queue>
using namespace std;
vector <int> v[NMAX];
queue <int>q;
int n,m,s,x,y;
int dist[NMAX];
void bfs()
{   int nod,lung;
    while(!q.empty())
    {
        nod=q.front();
        q.pop();
        lung=v[nod].size();
        for(int i=0;i<lung;i++)
        {
            if(dist[v[nod][i]]==-1)
            {
                dist[v[nod][i]]=dist[nod]+1;
                q.push(v[nod][i]);
            }
        }
    }
}
int main()
{
    ifstream cin("bfs.in");
    ofstream cout("bfs.out");

    cin>>n>>m>>s;
    for(int i=1;i<=n;i++)
    {
        dist[i]=-1;
    }
    for(int i=1;i<=m;i++)
    {
        cin>>x>>y;
        v[x].push_back(y);
    }
    q.push(s);
    dist[s]=0;
    bfs();
    for(int i=1;i<=n;i++)
    {
        cout<<dist[i]<<" ";
    }
    return 0;
}