Compilare: user.cpp: In function ‘void SolveTestCase()’: user.cpp:146:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( Pos != Edge[X].size() ) ^ user.cpp:153:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( Pos != Edge[Y].size() ) ^ user.cpp: In member function ‘void input_reader::Advance()’: user.cpp:20:49: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( Buffer, SIZE, 1, input_file ); ^ user.cpp: In constructor ‘input_reader::input_reader(const char*)’: user.cpp:32:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( Buffer, SIZE, 1, input_file ); ^