foo.cc: In function 'int MAX(int)':
foo.cc:5:5: error: 'cout' was not declared in this scope
    5 |     cout<<d%2;
      |     ^~~~
foo.cc: In function 'int main()':
foo.cc:11:9: error: 'cin' was not declared in this scope
   11 |         cin>>a;
      |         ^~~

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