Compilare: user.cpp: In function ‘void merge_sort(int, int)’: user.cpp:7:14: warning: unused variable ‘inv_count’ [-Wunused-variable] int mid, inv_count = 0; ^ user.cpp: In function ‘int main()’: user.cpp:49:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:51:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&A[i]); ^