Cod sursa(job #1537985)

Utilizator Vele_GeorgeVele George Vele_George Data 28 noiembrie 2015 12:52:39
Problema Stramosi Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.83 kb
#include <iostream>
#include <fstream>
#include <vector>
#define nmax 250005
using namespace std;

ifstream f("stramosi.in");
ofstream g("stramosi.out");

int st[20][nmax], n, m, x, y;
void Gen_stramosi()
{
    for(int i=1; i<=n; i++)
        f >> st[0][i];

    for(int i=1; (1<<i) <=n; i++)
    {
        for(int j=1; j<=n; j++)
        {
            st[i][j] = st[i-1][st[i-1][j]]; // al 2^(i-1)-lea stramos a stramosului de pe 2^(i-1)
        }
    }
    return;
}

int querry(int p, int nod)
{
    for(int i=0; (1<<i)<=p; i++)
        if( (1<<i) & p)
            nod = st[i][nod];
    return nod;
}

int main()
{

    f >> n >> m;
    Gen_stramosi();
    for(int i=1; i<=m; i++)
    {
        f >> x >> y;
        g << querry(y, x) << "\n";
    }


    f.close();
    g.close();
    return 0;
}