Compilare: user.cpp: In function ‘int GetInt()’: user.cpp:20: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:24: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int Unite(int, int)’: user.cpp:74: warning: no return statement in function returning non-void