foo.cc: In function 'int main()':
foo.cc:6:14: error: 'n' was not declared in this scope; did you mean 'yn'?
    6 |         cin>>n>>m;
      |              ^
      |              yn
foo.cc:6:17: error: 'm' was not declared in this scope
    6 |         cin>>n>>m;
      |                 ^

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