Compilare: user.cpp: In function ‘int main()’: user.cpp:14:24: warning: unused variable ‘c’ [-Wunused-variable] long int cmmdc, r, c; ^ user.cpp:8:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%ld", &n); ^ user.cpp:12:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%ld %ld", &a, &b); ^