Submission #1135881

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135881		daoquanglinh2007	Secret (JOI14_secret)	C++20	100 / 100	341 ms	12180 KiB

secret

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

const int NM = 1000;

int N, A[NM+5];
int f[4*NM+5][NM+5];

void build(int id, int l, int r, int t){
  if (t == 0){
    f[id][l] = A[l];
    for (int i = l+1; i <= r; i++)
      f[id][i] = Secret(f[id][i-1], A[i]);
  }
  if (t == 1){
    f[id][r] = A[r];
    for (int i = r-1; i >= l; i--)
      f[id][i] = Secret(A[i], f[id][i+1]);
  }
  if (l == r) return;
  int mid = (l+r)/2;
  build(2*id, l, mid, 1);
  build(2*id+1, mid+1, r, 0);
}

void Init(int _N, int _A[]){
  N = _N;
  for (int i = 1; i <= N; i++) A[i] = _A[i-1];
  build(1, 1, N, -1);
}

int get(int id, int l, int r, int u, int v){
  int mid = (l+r)/2;
  if (v <= mid) return get(2*id, l, mid, u, v);
  if (u > mid) return get(2*id+1, mid+1, r, u, v);
  return Secret(f[2*id][u], f[2*id+1][v]);
}

int Query(int L, int R){
  L++, R++;
  if (L == R) return A[L];
  return get(1, 1, N, L, R);
}

• Subtask 1: 100 / 100