foo.cc: In function 'int main()':
foo.cc:11:35: error: 'num' was not declared in this scope
         for(int j=0;j<n;j++) cin>>num;
                                   ^~~
foo.cc:11:35: note: suggested alternative: 'enum'
         for(int j=0;j<n;j++) cin>>num;
                                   ^~~
                                   enum

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