Cod sursa(job #1501428)

Utilizator bciobanuBogdan Ciobanu bciobanu Data 13 octombrie 2015 13:51:00
Problema Stramosi Scor 80
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.79 kb
#include <cstdio>

using namespace std;

const int Nmax = 250000 + 1;
const int lgMax = 18;

int d[lgMax][Nmax];

int main(void) {
    freopen("stramosi.in", "r", stdin);
    freopen("stramosi.out", "w", stdout);
    int n, m;
    int u, k;

    scanf("%d%d", &n, &m);
    for (int i = 1; i <= n; i++) {
        scanf("%d", &d[0][i]);
    }

    for (int i = 1; (1 << i) <= n; i++) {
        for (int j = 1; j <= n; j++) {
            d[i][j] = d[i - 1][d[i - 1][j]];
        }
    }

    for (int i = 0; i < m; i++) {
        scanf("%d%d", &u, &k);
        for (int i = 0; (1 << i) <= k; i++) {
            if ((k >> i) & 1) {
                u = d[i][u];
            }
        }
        printf("%d\n", u);
    }
    fclose(stdin);
    fclose(stdout);
    return 0;
}