Cod sursa(job #2648093)

Utilizator BogdanRazvanBogdan Razvan BogdanRazvan Data 8 septembrie 2020 16:52:43
Problema Stramosi Scor 90
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.86 kb

#include <bits/stdc++.h>

using namespace std;

ifstream fin ("stramosi.in");
ofstream fout ("stramosi.out");

void usain_bolt()
{
    ios::sync_with_stdio(false);
    fin.tie(0);
}

const int N = 250005;

int dad[N][18];

int main()
{
    usain_bolt();

    int n, q;

    fin >> n >> q;
    for(int i = 1; i <= n; ++i) {
        fin >> dad[i][0];
    }
    for(int j = 1; j <= 17; ++j) {
        for(int i = 1; i <= n; ++i) {
            dad[i][j] = dad[dad[i][j - 1]][j - 1];
        }
    }
    for(int i = 1; i <= q; ++i) {
        int x, y;

        fin >> x >> y;

        for(int ii = 17; ii >= 0; --ii) {
            if(y >= (1 << ii)) x = dad[x][ii], y -= (1 << ii);
        }
        if(y > 0) {
            fout << 0 << "\n";
        }
        else {
            fout << x << "\n";
        }
    }
    return 0;
}