Cod sursa(job #2093494)

Utilizator mihailrazMihail Turcan mihailraz Data 23 decembrie 2017 20:32:01
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.02 kb
#include <bits/stdc++.h>
#define NMAX 100000
#define MMAX 1000000

using namespace std;
ifstream fi("bfs.in");
ofstream fo("bfs.out");
int n,m,s;
int L[NMAX+1],VIZ[NMAX+1];
vector <int> VECINI[MMAX+1];
queue <int> Q;

void citire(void)
{
    int x,y;
    fi>>n>>m>>s;
    for(int i=1; i<=m; i++)
    {
        fi>>x>>y;
        VECINI[x].push_back(y);
    }
    for(int i=1; i<=n; i++)
        L[i]=-1;
}

void bfs(int start)
{
    int nod;
    Q.push(start);
    L[start]=0;
    VIZ[start]=1;
    while(!Q.empty())
    {
        nod=Q.front();
        for(int i=0; i<VECINI[nod].size(); i++)
            if(VIZ[VECINI[nod][i]]==0)
            {
                L[VECINI[nod][i]]=L[nod]+1;
                VIZ[VECINI[nod][i]]=1;
                Q.push(VECINI[nod][i]);
            }
        Q.pop();
    }
}

void afisare(void)
{
    for(int i=1; i<=n; i++)
        fo<<L[i]<<" ";
}

int main()
{
    citire();
    bfs(s);
    afisare();
    fi.close();
    fo.close();
    return 0;
}