Compilare: user.c: In function ‘HeapSort’: user.c:56: warning: unused variable ‘aux’ user.c: In function ‘main’: user.c:98: warning: assignment from incompatible pointer type user.c:85: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:87: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:89: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:102: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result