def binarySearch(nums, target):
"""
:type nums: List[int]
:type target: int
:rtype: int
"""
if len(nums) == 0:
return -1
left, right = 0, len(nums)
while left < right:
mid = (left + right) // 2
if nums[mid] == target:
return mid
elif nums[mid] < target:
left = mid + 1
else:
right = mid
# Post-processing:
# End Condition: left == right
if left != len(nums) and nums[left] == target:
return left
return -1
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