Instructions:
Reproduce the behavior of replacement selection for the minimum heap
below. You can swap keys by clicking the first one and
then the second one in the binary heap. To move values from the
heap to the output array you must click on the array representation
for the heap. Same for moving values from input to the heap. Begin
by outputting the root of the heap to the output array.
If the input is too small swap the values and decrement the size of
the heap by clicking the "decrement" button. After that, restore
the heap property again.