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Update binary_search.py

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marina 2023-07-31 14:58:10 -07:00 committed by GitHub
parent afdff04a69
commit 2396654457
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1 changed files with 19 additions and 12 deletions
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31
searching/binary_search.py
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@ -6,54 +6,61 @@
def binary_search_recursive(array, item, higher=None, lower=0):
higher = higher or len(array)
if higher < lower:
return False
mid = (higher + lower)//2
mid = (higher + lower) // 2
if item == array[mid]:
return mid
elif item < array[mid]:
return binary_search_recursive(array, item, higher=mid-1, lower=lower)
return binary_search_recursive(array, item, mid - 1, lower)
else:
return binary_search_recursive(array, item, higher=higher, lower=mid+1)
return binary_search_recursive(array, item, =higher, mid + 1)
def binary_search_iterative(array, item):
lower, higher = 0, len(array)
while lower < higher:
mid = (higher+lower)//2
mid = (highe r+ lower) // 2
if array[mid] == item:
return mid
elif array[mid] > item:
higher = mid
else:
lower=mid+1
lower = mid + 1
return False
def binary_search_matrix(matrix, item, lower=0, higher=None):
""" Binary search in a matrix """
if not matrix:
return None
rows = len(matrix)
cols = len(matrix[0])
higher = higher or rows*cols
higher = higher or rows * cols
if higher > lower:
mid = (higher + lower)//2
row = mid//cols
col = mid%cols
mid = (higher + lower) // 2
row = mid // cols
col = mid % cols
item = matrix[row][col]
if item == item:
return row, col
elif item < item:
return binary_search_matrix(matrix, item, lower, mid-1)
return binary_search_matrix(matrix, item, lower, mid - 1)
else:
return binary_search_matrix(matrix, item, mid+1, higher)
return binary_search_matrix(matrix, item, mid + 1, higher)
return None