Compilare: user.c: In function ‘mergeSort’: user.c:6:5: warning: implicit declaration of function ‘_mergeSort’ [-Wimplicit-function-declaration] return _mergeSort(arr, temp, 0, size - 1); ^ user.c: In function ‘_mergeSort’: user.c:17:9: warning: implicit declaration of function ‘_merge’ [-Wimplicit-function-declaration] inv += _merge(arr, temp, left, mid + 1, right); ^ user.c: In function ‘main’: user.c:55:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.c:58:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", a + i); ^