Submission #926628

#	Time	Username	Problem	Language	Result	Execution time	Memory
926628		myst6	Secret (JOI14_secret)	C++14	Compilation error	0 ms	0 KiB

secret

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include <memory.h>
#include "secret.h"

const int maxn = 1000;
int table[10][maxn];
int mask[maxn];
int base[maxn];

void fill(int L, int R, int B) {
  if (L == R) return;
  int M = (L + R) / 2;
  table[B][M] = base[M];
  table[B][M+1] = base[M+1];
  for (int i=M-1; i>=L; i--) table[B][i] = Secret(base[i], table[B][i+1]);
  for (int i=M+2; i<=R; i++) table[B][i] = Secret(table[B][i-1], base[i]);
  for (int i=M+1; i<=R; i++) mask[i] ^= 1 << B;
  fill(L, M, B+1);
  fill(M+1, R, B+1);
}

void Init(int N, int A[]) {
  std::memset(mask, 0, sizeof mask);
  for (int i=0; i<N; i++) base[i] = A[i];
  fill(0, N-1, 0);
}

int Query(int L, int R) {
  if (L == R) return base[L];
  int B = __builtin_ctz(mask[L] ^ mask[R]);
  return Secret(table[B][L], table[B][R]);
}

Compilation message (stderr)

secret.cpp: In function 'void Init(int, int*)':
secret.cpp:25:8: error: 'memset' is not a member of 'std'; did you mean 'memset'?
   25 |   std::memset(mask, 0, sizeof mask);
      |        ^~~~~~
In file included from /usr/include/features.h:461,
                 from /usr/include/memory.h:25,
                 from secret.cpp:4:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:59:1: note: 'memset' declared here
   59 | __NTH (memset (void *__dest, int __ch, size_t __len))
      | ^~~~~