Compilare: user.cpp: In function ‘bool check(int)’: user.cpp:62:12: warning: unused variable ‘Q’ [-Wunused-variable] int i, Q = 0; ^ user.cpp: In function ‘int main()’: user.cpp:79:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &n); ^ user.cpp:85:18: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets( A ); len1 = strlen( A ); ^ user.cpp:86:18: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets( B ); len2 = strlen( B ); ^ /tmp/ccZOKzyL.o: In function `main': user.cpp:(.text.startup+0xf3): warning: the `gets' function is dangerous and should not be used.