Compilare: user.cpp: In function ‘int main()’: user.cpp:174:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0, j = 1; i < lst2.size(); i ++, j = ( ( j + 1 == lst2.size() ) ? 0 : ( j + 1 ) ) ) ^ user.cpp:174:82: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0, j = 1; i < lst2.size(); i ++, j = ( ( j + 1 == lst2.size() ) ? 0 : ( j + 1 ) ) ) ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:14:38: 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); ^