Compilare: user.cpp: In function ‘int main()’: user.cpp:52:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < h[box].size() && h[box][j] != x) ^ user.cpp:54:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j < h[box].size()) ^ user.cpp: In function ‘char getch()’: user.cpp:18:30: 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, BUFF, fin); ^