algorithm/tech-interview-handbook
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Tay Yang Shun
2017-09-20 15:27:28 +08:00
commit 2182a70770
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utilities/binary_search.py Normal file
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def binary_search(arr, target):
left = 0;
right = len(arr) - 1
while left < right:
mid = left + (right - left) / 2;
if arr[mid] == target:
return mid
elif arr[mid] < target:
left = mid + 1
else:
right = mid - 1
return left
print(binary_search([1, 2, 3, 10], 1) == 0)
print(binary_search([1, 2, 3, 10], 2) == 1)
print(binary_search([1, 2, 3, 10], 3) == 2)
print(binary_search([1, 2, 3, 10], 10) == 3)
print(binary_search([1, 2, 3, 10], 9) == 3)
print(binary_search([1, 2, 3, 10], 4) == 3)
print(binary_search([1, 2, 3, 10], 0) == 0)
print(binary_search([1, 2, 3, 10], 11) == 3)
print(binary_search([5, 7, 8, 10], 3) == 0)