Compilare: user.cpp: In function ‘int main()’: user.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(n<St.size()) { ^ user.cpp:34:12: warning: unused variable ‘i’ [-Wunused-variable] int n=0,m,i,op,x,st,dr,mid,last; ^ user.cpp: In function ‘unsigned int getInt()’: user.cpp:20:30: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^ user.cpp:24:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^