Cod sursa(job #1537947)

Utilizator beatrice01Ferco Beatrice beatrice01 Data 28 noiembrie 2015 12:18:06
Problema Stramosi Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.66 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("stramosi.in");
ofstream fout ("stramosi.out");

int n,m,f[19][250005];

int query (int p,int q)
{
    for(int i=0; (1<<i)<=p; ++i)
        if( (1<<i) & p ) q= f[i][q];
    return q;
}

int main()
{
    fin>>n>>m;
    for(int i=1; i<=n; i++)
    {
        int j;
        fin>>j;
        f[0][i]=j;
    }
    for(int i=1; (1<<i)<=n; i++)
    {
        for(int j=1; j<=n; j++)
        {
            f[i][j]=f[i-1][f[i-1][j]];
        }
    }
    for(int i=1; i<=m; i++)
    {
        int x,y;
        fin>>x>>y;
        fout<<query(y,x)<<'\n';
    }
    return 0;
}