Compilare: user.cpp: In function ‘int main()’: user.cpp:53:9: warning: variable ‘optim’ set but not used [-Wunused-but-set-variable] int optim = 0; ^ user.cpp:42:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &n); ^ user.cpp:47:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &x); ^