Cod sursa(job #1170988)

Utilizator Qwerty0606Adrian Tutunaru Qwerty0606 Data 14 aprilie 2014 22:46:11
Problema Stramosi Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.85 kb
#include <cstdio>
#include <cmath>
 
using namespace std;
 
#define NMAX 250003
 
int n, m, p, q, logaritm;
int best[18][NMAX];
 
int main ()
{
    freopen ("stramosi.in", "r", stdin);
    freopen ("stramosi.out", "w", stdout);
 
    scanf ("%d %d", &n, &m);
    for (int i = 1, x; i <= n; ++i)
    {
        scanf ("%d", &x);
        best[0][i] = x;
    }
 
    logaritm = log2 (n);
 
    for (int i = 1; i <= logaritm; ++i)
    {
        for (int j = 1; j <= n; ++j)
            best[i][j] = best[i - 1][best[i-1][j]];
    }
 
    for (int i = 1; i <= m; ++i)
    {
        scanf ("%d %d", &q, &p);
        p <<= 1;
        for (int j = 0; j <= logaritm; ++j)
        {
            if (q == 0) break;
            p >>= 1;
            if (p & 1) q = best[j][q];
        }
 
        printf ("%d\n", q);
    }
 
    return 0;
}