Cod sursa(job #3261498)

Utilizator AndreiNicolaescuEric Paturan AndreiNicolaescu Data 6 decembrie 2024 14:09:35
Problema Stramosi Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.76 kb
#include <fstream>
#include <vector>
using namespace std;
ifstream cin("stramosi.in");
ofstream cout("stramosi.out");
const int Nmax = 250001;
int n, m, x, y;
int anc[20][Nmax];
void binarylifting()
{
    for(int l=1; l<20; l++)
        for(int i=1; i<=n; i++)
            anc[l][i] = anc[l-1][anc[l-1][i]];
}
int ans(int node, int nanc)
{
    if(nanc >= (1<<20))
        return 0;
    for(int l=0; l<20; l++)
        if(nanc & (1<<l))
            node = anc[l][node];
    return node;
}
int main()
{
    cin >> n >> m;
   // anc.assign(n+1, vector<int>(20, 0));
    for(int i=1; i<=n; i++)
        cin >> anc[0][i];
    binarylifting();
    while(m--)
    {
        cin >> x >> y;
        cout << ans(x, y) << '\n';
    }
    return 0;
}