Cod sursa(job #1791058)

Utilizator GeanaVladGeana Vlad GeanaVlad Data 29 octombrie 2016 00:27:45
Problema Stramosi Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.78 kb
#include <iostream>
#include<fstream>
using namespace std;
ifstream f("stramosi.in");
ofstream g("stramosi.out");
int n,q,i,v[250001],log2[20],p,k,r[250001][20],p2,j;
inline void BuildRMQ()
{
    int m=log2[n]+1,i,j;
    for(i=1; i<=n; i++)
        r[i][0]=v[i];
    for(j=1; j<m; j++)
        for(i=1; i<=n; i++)
            r[i][j]=r[r[i][j-1]][j-1];
}
int main()
{
    f>>n>>q;
    for(i=1; i<=n; i++)
        f>>v[i];
    log2[1]=0;
    for(i=2; i<=n; i++)
        log2[i]=log2[i/2]+1;
    BuildRMQ();
    for(; q; q--)
    {
        f>>p>>k;//al k lea stramos al lui p
        while(k && p)
        {
            p2=1;
            for(j=0; p2*2<=k; ++j)
                p2*=2;

            p=r[p][j];
            k-=p2;
        }
        g<<p<<'\n';
    }
}