Cod sursa(job #2438740)

Utilizator capmareAlexCapmare Alex capmareAlex Data 13 iulie 2019 16:43:34
Problema Stramosi Scor 90
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.68 kb
#include <bits/stdc++.h>
#define NMAX 250000
using namespace std;
ifstream fin("stramosi.in");
ofstream fout("stramosi.out");
int n,m;
int mat[20][NMAX];
int v[NMAX];
int lg2[NMAX];
int main()
{
    fin>>n>>m;
    for(int i=1;i<=n;++i)
    {
        fin>>v[i];
        mat[0][i]=v[i];
    }
    for(int i=2;i<NMAX;++i)
        lg2[i]=lg2[i/2]+1;
    for(int i=1;i<=lg2[n];++i)
        for(int j=1;j<=n;++j)
        mat[i][j]=mat[i-1][mat[i-1][j]];
    for(int i=1;i<=m;++i)
    {

        int x,y;
        fin>>x>>y;

        while(y)
        {
            x=mat[lg2[y]][x];
            y=y-(1<<lg2[y]);
        }
        fout<<x<<"\n";
    }
    return 0;
}