Compilare: user.cpp: In function ‘int unite_groups(int, int)’: user.cpp:26: warning: no return statement in function returning non-void user.cpp: In function ‘int get_int()’: user.cpp:30: warning: array subscript has type ‘char’ user.cpp:30: warning: array subscript has type ‘char’ user.cpp:31: warning: array subscript has type ‘char’ user.cpp: In function ‘long long int get_long()’: user.cpp:38: warning: array subscript has type ‘char’ user.cpp:38: warning: array subscript has type ‘char’ user.cpp:39: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:47: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:51: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/ccn52UEb.o: In function `main': user.cpp:(.text+0x1c6): warning: the `gets' function is dangerous and should not be used.