Compilare: user.cpp: In member function ‘int ifbuffer::getnr()’: user.cpp:39:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( !isDigit[c] && c != '-' ) ^ user.cpp:46:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( isDigit[c] ) { ^ user.cpp: In function ‘void build_1(int, int)’: user.cpp:95:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < nei[n].size(); i ++ ) { ^ user.cpp:103:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( i < nei[n].size() ) { ^ user.cpp: In function ‘void build_2(int, int)’: user.cpp:115:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < nei[n].size(); i ++ ) ^ user.cpp: In function ‘int main()’: user.cpp:120:33: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] ifbuffer fin( "capitala.in" ); ^ user.cpp:123:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, a, b; ^ user.cpp: In member function ‘void ifbuffer::refill()’: user.cpp:23:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( text, 1, size, file ); ^