Compilare: user.cpp: In function ‘int main()’: user.cpp:68:23: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] sol[poz+1]=NULL; ^ user.cpp:73:23: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] if(poz) sol[poz+1]=NULL,g<<(sol+1); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:34:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:10:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^