Main.cc: In function ‘int min_height_difference(int*, int)’:
Main.cc:10:36: error: ‘compare’ was not declared in this scope
10 | qsort(heights, n, sizeof(int), compare);
| ^~~~~~~
Main.cc: In function ‘int main()’:
Main.cc:17:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
17 | scanf("%d", &N);
| ~~~~~^~~~~~~~~~
Main.cc:22:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
22 | scanf("%d", &heights[i]);
| ~~~~~^~~~~~~~~~~~~~~~~~~