if we are supposed to mutate board like so: board[row][col] = count;, board should be declared as char *const *board

Pressing "Test" passes the tests.
Pressing "Attempt" solves many tests, even many data-sets within the random_tests.
However, the random_tests fail after many sets.

STD Err:
main.cpp:63:34: warning: comparison of integers of different signs: 'size_t' (aka 'unsigned long') and 'int' [-Wsign-compare]
for (size_t index = 0; index < lhsSize && areEqual; ++index) {
~~~~~ ^ ~~~~~~~
main.cpp:155:50: warning: 'sizeof (output)' will return the size of the pointer, not the array itself [-Wsizeof-pointer-div]
assertArraysEquals(output, sizeof(output)/sizeof(int), output_gt, sizeof(output)/sizeof(int));
~~~~~~~~~~~~~~^
main.cpp:155:89: warning: 'sizeof (output)' will return the size of the pointer, not the array itself [-Wsizeof-pointer-div]
assertArraysEquals(output, sizeof(output)/sizeof(int), output_gt, sizeof(output)/sizeof(int));
~~~~~~~~~~~~~~^
3 warnings generated.

Max Buffer Size Reached (1.5 MiB)

-> now, did I screw up something, or are the random_tests crashing from time to time?
-> PLUS: The random test input arrays are NOT sorted as stated in the instructions.

https://www.codewars.com/kata/reviews/5a4b7c31b3f0a15f7200000c/groups/5ea10ceece3ee600010f4bb0

https://www.codewars.com/kata/reviews/5a4b7c31b3f0a15f7200000c/groups/5ea0929b02cf740001c01a50

https://www.codewars.com/kata/reviews/5a4b7c31b3f0a15f7200000c/groups/5ea0922502cf740001c01513

https://www.codewars.com/kata/reviews/5a4b7c31b3f0a15f7200000c/groups/5ea08dd42c977a0001dfcbcc

https://www.codewars.com/kata/reviews/5a4b7c31b3f0a15f7200000c/groups/5ea07aebc0c41f0001473fb9

Still a duplicate.