Cod sursa(job #2789486)

Utilizator Dennis_SoareDennis Soare Dennis_Soare Data 27 octombrie 2021 16:32:58
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.38 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>

using namespace std;

ifstream in("bfs.in");
ofstream out("bfs.out");

queue<int>coada;

void solve()
{
    int N, M, S;
    in>>N>>M>>S;
    vector<int>vecini[N+1];
    bool vizitat[N+1];
    int inaltime[N+1];
    for(int i=0; i<=N+1; i++)
    {
        vizitat[i] = false;
        inaltime[i] = 0;
    }
    for(int i=0; i<M; i++)
    {
        int x,y;
        in>>x>>y;
        vecini[x].push_back(y);
    }
    /*for(int i=1; i<=N; i++)
    {
        cout<< i <<": ";
        int l = vecini[i].size();
        for(int j=0; j<l; j++)
        {
            cout << vecini[i][j]<<' ';
        }
        cout<<endl;
    }*/

    coada.push(S);
    vizitat[S] = true;
    while(!coada.empty())
    {
        int nod_curent = coada.front();
        coada.pop();
        for(int i=0; i<vecini[nod_curent].size(); i++)
        {
            int x = vecini[nod_curent][i];
            if(!vizitat[x])
            {
                vizitat[x] = true;
                coada.push(x);
                inaltime[x] = inaltime[nod_curent] + 1;
            }
        }
    }

    for(int i=1; i<=N; i++)
    {
        if(inaltime[i] == 0 && i != S)
            out << -1 <<' ';
        else
            out<<inaltime[i]<<' ';
    }
}

int main()
{
    solve();
    return 0;
}