Compilare: user.cpp: In function ‘int main()’: user.cpp:187:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for0(i, sol.size()) ^ user.cpp:2:34: note: in definition of macro ‘for0’ #define for0(i,n) for(int i=0; i<n; i++) ^ user.cpp: In member function ‘char InParsare::read_character()’: user.cpp:33:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, CHARMAX, fin); ^