Submission #1186520

#	Time	Username	Problem	Language	Result	Execution time	Memory
1186520		akamizane	Secret (JOI14_secret)	C++20	Compilation error	0 ms	0 KiB

secret

#include "secret.h"

int pre[1000][1000], n;

void d(int L, int R, int A[]){
   int mid = (L + R) / 2;
   pre[mid][mid] = A[mid];
   pre[mid + 1][mid + 1] = A[mid + 1];
   for (int i = mid + 2; i <= R; i++){
      pre[mid + 1][i] = Secret(pre[mid + 1][i - 1], A[i]);
   }
   for (int i = mid - 1; i >= L; i--){
      pre[mid][i] = Secret(pre[mid][i + 1], A[i]);
   }
   if (L < mid) d(L, mid, A);
   if (mid + 1 < R) d(mid + 1, R, A);
}

void Init(int N, int A[]) {
   n = N;
   d(0, N - 1, A);
}


int Query(int L, int R) {
   int a = 0, b = n - 1;
   while(a != b){
      int mid = (a + b) / 2;
      if (L <= mid && mid < R) return Secret(prefix[mid][L], prefix[mid + 1][R]);
      else if (mid == R) return pre[mid][L];
      else if (mid < L) a = mid + 1;
      else b = mid;
   }
   return pre[a][a];
}

Compilation message (stderr)

secret.cpp: In function 'int Query(int, int)':
secret.cpp:29:46: error: 'prefix' was not declared in this scope
   29 |       if (L <= mid && mid < R) return Secret(prefix[mid][L], prefix[mid + 1][R]);
      |                                              ^~~~~~