of all the numbers strictly to the index's right. If the index is on the left edge of the array, then the left sum is 0 because there are no elements to the left. This also applies to the right edge ...

# A peak element is an element that is greater than its neighbors. # Given an input array where num[i] ≠ num[i+1], find a peak element and return its index. # The array may contain multiple peaks, in ...