Compilare: user.cpp: In function ‘int main()’: user.cpp:42:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(S.size()>D+1) ~~~~~~~~^~~~ user.cpp: In function ‘void Read(int&)’: user.cpp:22:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos=0,fread(f,1,MAX,IN); ^ user.cpp:28:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos=0,fread(f,1,MAX,IN); ^ user.cpp: In function ‘int main()’: user.cpp:34:22: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(f,1,MAX,IN); ^