Cod sursa(job #2111234)

Utilizator MikeStrikeAgache Mihai MikeStrike Data 21 ianuarie 2018 18:41:10
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.82 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#define NMAX 100005
using namespace std;
int D[NMAX];
vector < int > lista[NMAX];
queue <int > coada;
int n,m,s,nod,vecin;
ifstream in("bfs.in");
ofstream out("bfs.out");
void BFS()
{
    while(!coada.empty())
    { nod=coada.front();
        for(size_t i=0;i<lista[nod].size();i++)
        {
            vecin=lista[nod][i];
            if(D[vecin]==-1)
            {
                D[vecin]=D[nod]+1;
                coada.push(vecin);
            }
        }
        coada.pop();
    }
}
int main()
{
in>>n>>m>>s;
for(int i=1;i<=m;i++)
{
    int x,y;
    in>>x>>y;
    lista[x].push_back(y);
}
coada.push(s);
for(int i=1;i<=n;i++)
    D[i]=-1;
D[s]=0;
BFS();

for(int i=1;i<=n;i++)
    out<<D[i]<<' ';
    return 0;
}