/in/foo.cc: In function 'int main()':
/in/foo.cc:34:4: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    gets(I[i]);
    ^~~~
In file included from /in/foo.cc:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:34:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    gets(I[i]);
             ^
In file included from /in/foo.cc:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:42:19: warning: array subscript has type 'char' [-Wchar-subscripts]
     if(ava[temp[0]]==1)
                   ^
/in/foo.cc:48:17: warning: array subscript has type 'char' [-Wchar-subscripts]
      ava[temp[0]]=1;
                 ^
/in/foo.cc:62:22: warning: array subscript has type 'char' [-Wchar-subscripts]
     ava[S.top().first]=0;
                      ^
/in/foo.cc:68:39: warning: array subscript has type 'char' [-Wchar-subscripts]
   while (!S.empty()) ava[S.top().first]=0, S.pop();
                                       ^
/tmp/cc44Kq5R.o: In function `main':
foo.cc:(.text.startup+0xdb): warning: the `gets' function is dangerous and should not be used.