Compilare: user.cpp: In function ‘bool gaseste(int)’: user.cpp:60:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<usu[k].size();++i) if(usu[k][i]==val) return 1; ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:13:38: 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); ^