Cod sursa(job #2862363)

Utilizator vralexRadu Vasilescu vralex Data 5 martie 2022 12:13:50
Problema Stramosi Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.67 kb
#include <fstream>

using namespace std;

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

int t[250001][20];
int log2[250001];
int main()
{
    int n,m,q,p;
    fin>>n>>m;
    for(int i=1; i<=n; i++)
        fin>>t[i][0];
    for(int i=1; i<=n; i++)
    {
        for(int j=1; (1<<j)<=n; j++)
        {
            t[i][j]=t[t[i][j-1]][j-1];
        }
    }
    log2[1]=0;
    for(int i=2; i<=n; i++)
        log2[i]=log2[i/2]+1;
    for(int i=1; i<=m; i++)
    {
        fin>>q>>p;
        while(p>0)
        {
            int x=log2[p];
            q=t[q][x];
            p-=(1<<x);
        }
        fout<<q<<'\n';
    }
    return 0;
}