Cod sursa(job #3235502)

Utilizator PetstebPopa Petru Petsteb Data 18 iunie 2024 10:14:52
Problema Stramosi Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.98 kb
#include <fstream>
#include <iostream>
#include <vector>
using namespace std;
const int NMAX = 250001;
const int LMAX = 21;
vector<int> L[NMAX];
int stramos[NMAX][LMAX];
int tata[NMAX];
int main()
{
    int n, m;
    ifstream fin("stramosi.in");
    ofstream fout("stramosi.out");
    fin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        int x;
        fin >> x;
        tata[i] = x;
    }
    for (int i = 1; i <= n; i++)
    {
        stramos[i][0] = tata[i];
    }
    for (int j = 1; j <= 20; j++)
    {
        for (int i = 1; i <= n; i++)
        {
            stramos[i][j] = stramos[stramos[i][j - 1]][j - 1];
        }
    }
    for (int i = 1; i <= m; i++)
    {
        int p, q;
        fin >> p >> q;
        int j = 0;
        while (q)
        {
            if ((1 << j) & q)
            {
                p = stramos[p][j];
                q -= (1 << j);
            }
            j += 1;
        }

        fout << p << '\n';
    }
}