foo.cc: In function 'int main()':
foo.cc:22:13: warning: the address of 'int Ishui(int)' will never be NULL [-Waddress]
   22 |         if (Ishui)  m++;
      |             ^~~~~
foo.cc:4:5: note: 'int Ishui(int)' declared here
    4 | int Ishui(int x)
      |     ^~~~~
foo.cc: In function 'int Ishui(int)':
foo.cc:13:5: warning: 'm' may be used uninitialized [-Wmaybe-uninitialized]
   13 |     if (m == xx) return 1;
      |     ^~
foo.cc:6:16: note: 'm' was declared here
    6 |     int xx = x,m;
      |                ^

[Hydro](https://hydro.ac)提供评测服务