foo.cc: In function 'int main()':
foo.cc:9:14: warning: 'm' is used uninitialized [-Wuninitialized]
    9 |         if (m>n) swap(m,n);
      |             ~^~
foo.cc:7:13: note: 'm' declared here
    7 |         int m, n;
      |             ^
foo.cc:9:14: warning: 'n' is used uninitialized [-Wuninitialized]
    9 |         if (m>n) swap(m,n);
      |             ~^~
foo.cc:7:16: note: 'n' declared here
    7 |         int m, n;
      |                ^

[Hydro](https://hydro.ac)提供评测服务