foo.cc:3:30: error: 'DOUBLE' was not declared in this scope
    3 | int n;double a[5000005],min1=DOUBLE LONG_MAX,min2;
      |                              ^~~~~~
foo.cc: In function 'int main()':
foo.cc:8:11: error: invalid operands of types 'double' and 'double' to binary 'operator>>'
    8 |   cin>a[i]>>a[n+i];
      |       ~~~~^~~~~~~~
      |          |       |
      |          double  double

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