Cod sursa(job #1584996)

Utilizator feli2felicia iuga feli2 Data 30 ianuarie 2016 17:50:46
Problema Stramosi Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.76 kb
#include <iostream>
#include <fstream>

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

int str[20][250005], log[250005], n, m, i, j, p, q;

int query(int p, int q)
{
    int put=0, stra=q;
    while((1<<put)<=p)
    {
        if((1<<put)&p)
        {
            stra=str[put][stra];
        }
        put++;
    }
    return stra;
}

int main()
{
    fin>>n>>m;
    for(i=1;i<=n;i++)
    {
        fin>>str[0][i];
    }
    for(i=2;i<=n;i++)
        log[i]=log[i/2]+1;
    for(i=1;(1<<i)<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            str[i][j]=str[i-1][str[i-1][j]];
        }
    }
    for(i=1;i<=m;i++)
    {
        fin>>q>>p;
        fout<<query(p, q)<<'\n';
    }
    return 0;
}