Submission #729954

#	Time	Username	Problem	Language	Result	Execution time	Memory
729954		jampm	Secret (JOI14_secret)	C++17	100 / 100	503 ms	4380 KiB

secret

#include "secret.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long int;

int const Mxn = 1e3 + 1;
int const LOGN = 13;


ll ST[LOGN][Mxn];
ll A[Mxn];
int n;

void build(int L = 0, int R = n - 1, int depth = 0) {
  if (L == R) return;
  int Mid = (L + R)>>1;
  for (int i = Mid + 1; i <= R; i++) {
    ST[depth][i] = (i == Mid + 1) ? A[i] : Secret(ST[depth][i - 1], A[i]);
  }
  for (int i = Mid; i >= L; i--) {
    ST[depth][i] = (i == Mid) ? A[i] : Secret(A[i], ST[depth][i + 1]);
  }
  build(L, Mid, depth + 1), build(Mid + 1, R, depth + 1);
}
ll query(int l, int r, int L = 0, int R = n - 1, int depth = 0) {
  if (L == R) return A[L];
  int Mid = (L + R)>>1;
  if (l <= Mid && Mid < r) return Secret(ST[depth][l], ST[depth][r]);
  if (r <= Mid) return query(l, r, L, Mid, depth + 1);
  else return query(l, r, Mid + 1, R, depth + 1);
}

void Init(int N, int a[]) {
  for (int i = 0; i < N; i++) A[i] = a[i];
  n = N; build();
}

int Query(int L, int R) {
  return query(L, R);
}

• Subtask 1: 100 / 100