Compilare: user.cpp: In function ‘void my_rotate(int)’: user.cpp:28:9: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a, b; ^ user.cpp:41:9: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a, b; ^ user.cpp: In function ‘int main()’: user.cpp:59:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[i]].push_back (i + 1); ^ user.cpp:64:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[i] = f[ch].back(); ^ user.cpp:65:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[ch].pop_back(); ^ user.cpp:54:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("puzzle.in", "r", stdin); ^ user.cpp:55:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("puzzle.out", "w", stdout); ^ user.cpp:56:11: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (s); ^ /tmp/cc81AdJi.o: In function `main': user.cpp:(.text.startup+0x55): warning: the `gets' function is dangerous and should not be used.