left to 1 and right to the maximum number in piles.left is less than right:
a. Calculate mid as the average of left and right (integer division).
b. Use mid as the current eating speed and calculate the total hours needed to eat all piles.
c. If the total hours is less than or equal to h, update right to mid.
d. Otherwise, update left to mid + 1.left will be the minimum speed at which Koko can eat all the bananas within h hours.