Created
November 17, 2020 17:35
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| from typing import List | |
| def bsearch(A: List[int], x: int) -> int: | |
| if not A: | |
| return -1 | |
| i, j = 0, len(A)-1 | |
| while i <= j: | |
| mid = i+(j-i)//2 | |
| if A[mid] == x: | |
| return mid | |
| elif x < A[mid]: | |
| i, j = i, mid-1 | |
| else: | |
| i, j = mid+1, j | |
| return -1 | |
| def test_bsearch(): | |
| assert bsearch([], 42) == -1 | |
| assert bsearch([42], 42) == 0 | |
| assert bsearch([1, 42], 42) == 1 | |
| assert bsearch([i for i in range(43)], 42) == 42 | |
| assert bsearch([i for i in range(43)], 100) == -1 | |
| assert bsearch([i for i in range(43)], -100) == -1 |
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