umbers sorted from little to great. You want to see if number 480 is among them.
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Step 1. If the range is only 1 element wide (obviously, that's not true for the first iteration but we'll get there), then if the element is 480 then the range start is its index in the array. If it's not, then there is no 480 in the array at all. Either way, we're done.
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Step 2. Split the range in half. Now you have two sorted arrays. On the first iteration, the first contains 320 numbers from first to 319