foo.cc: In function 'int main()':
foo.cc:7:12: error: 'n' was not declared in this scope
    7 |     cin >> n;
      |            ^
foo.cc:8:9: error: 'm' was not declared in this scope; did you mean 'tm'?
    8 |  cin >> m;
      |         ^
      |         tm

[Hydro](https://hydro.ac)提供评测服务