Language: C++

#include <algorithm>
#include <iostream>
#include <vector>

int solve_F() {
  size_t N = 0;
  std::cin >> N;

  std::vector<uint64_t> A(N);
  uint64_t mask = 0;
  for (auto& a : A) {
    std::cin >> a;
    mask ^= a;
  }

  uint64_t result = mask;
  std::vector<uint64_t> reds;
  reds.push_back(0);
  for (size_t i = 0; i < N; ++i) {
    const size_t size = reds.size();
    reds.resize(2 * size);
    for (size_t j = 0; j < size; ++j) {
      const uint64_t red = reds[j] ^ A[i];
      reds[size + j] = red;
      result = std::max(result, red + (mask ^ red));
    }
  }

  std::cout << result;
  return 0;
}


Compiler output:
a.cc: In function 'int solve_F()':
a.cc:9:15: error: 'uint64_t' was not declared in this scope
    9 |   std::vector<uint64_t> A(N);
      |               ^~~~~~~~
a.cc:4:1: note: 'uint64_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
    3 | #include <vector>
  +++ |+#include <cstdint>
    4 | 
a.cc:9:23: error: template argument 1 is invalid
    9 |   std::vector<uint64_t> A(N);
      |                       ^
a.cc:9:23: error: template argument 2 is invalid
a.cc:10:11: error: expected ';' before 'mask'
   10 |   uint64_t mask = 0;
      |           ^~~~~
      |           ;
a.cc:11:18: error: 'begin' was not declared in this scope; did you mean 'std::begin'?
   11 |   for (auto& a : A) {
      |                  ^
      |                  std::begin
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:2:
/usr/include/c++/14/bits/range_access.h:114:37: note: 'std::begin' declared here
  114 |   template<typename _Tp> const _Tp* begin(const valarray<_Tp>&) noexcept;
      |                                     ^~~~~
a.cc:11:18: error: 'end' was not declared in this scope; did you mean 'std::end'?
   11 |   for (auto& a : A) {
      |                  ^
      |                  std::end
/usr/include/c++/14/bits/range_access.h:116:37: note: 'std::end' declared here
  116 |   template<typename _Tp> const _Tp* end(const valarray<_Tp>&) noexcept;
      |                                     ^~~
a.cc:13:5: error: 'mask' was not declared in this scope
   13 |     mask ^= a;
      |     ^~~~
a.cc:16:11: error: expected ';' before 'result'
   16 |   uint64_t result = mask;
      |           ^~~~~~~
      |           ;
a.cc:17:23: error: template argument 2 is invalid
   17 |   std::vector<uint64_t> reds;
      |                       ^
a.cc:18:8: error: request for member 'push_back' in 'reds', which is of non-class type 'int'
   18 |   reds.push_back(0);
      |        ^~~~~~~~~
a.cc:20:30: error: request for member 'size' in 'reds', which is of non-class type 'int'
   20 |     const size_t size = reds.size();
      |                              ^~~~
a.cc:21:10: error: request for member 'resize' in 'reds', which is of non-class type 'int'
   21 |     reds.resize(2 * size);
      |          ^~~~~~
a.cc:23:13: error: 'uint64_t' does not name a type
   23 |       const uint64_t red = reds[j] ^ A[i];
      |             ^~~~~~~~
a.cc:23:13: note: 'uint64_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
a.cc:24:11: error: invalid types 'int[long unsigned int]' for array subscript
   24 |       reds[size + j] = red;
      |           ^
a.cc:24:24: error: 'red' was not declared in this scope; did you mean 'reds'?
   24 |       reds[size + j] = red;
      |                        ^~~
      |                        reds
a.cc:25:7: error: 'result' was not declared in this scope
   25 |       result = std::max(result, red + (mask ^ red));
      |       ^~~~~~
a.cc:25:40: error: 'mask' was not declared in this scope
   25 |       result = std::max(result, red + (mask ^ red));
      |                                        ^~~~
a.cc:29:16: error: 'result' was not declared in this scope
   29 |   std::cout << result;
      |                ^~~~~~