Compilare: user.cpp: In function ‘int main()’: user.cpp:91:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; i++) { ^ user.cpp:98:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int base = 2; base < Bmax; base++) ^ user.cpp:107:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; i++) { ^ user.cpp:139:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; i++) ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:19:38: 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); ^