Given billions of unsorted numbers and we need to find first 1 million
numbers if all the numbers were sorted in non-descending order.
approach is to split up the numbers to multiple machines and sort
them.
Then make a tournament tree in such a way that each machine feeds the
lowest number it has, to the tree. After all the machines have fed
their lowest number, the tree outputs the minimum number which goes to
the output. This number say came from  i th machine. Now the next
number to the tree is fed by this ith machine only.
Repeat the above process for getting the 1st million numbers.

Now someone plz explain how to code this?

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