Compilare: user.cpp: In function ‘int main()’: user.cpp:130:13: warning: unused variable ‘lmin’ [-Wunused-variable] int n,i,lmin=1000000000,k,x,q=-1; ^ user.cpp:130:29: warning: unused variable ‘k’ [-Wunused-variable] int n,i,lmin=1000000000,k,x,q=-1; ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:75:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^