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Update find_pair_nums.py

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marina 2023-08-07 22:27:38 -07:00 committed by GitHub
parent e25dd1f601
commit 79872f08eb
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1 changed files with 13 additions and 14 deletions
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searching/find_pair_nums.py
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@ -2,22 +2,19 @@
# -*- coding: utf-8 -*- # -*- coding: utf-8 -*-
# author: bt3gl # author: bt3gl
# given a collection of numbers, find the pair
# of numbers that sum to a given number
def bs(array, desired_num): def bs(array, item):
start = 0 start, end = 0, len(array)
end = len(array)
mid = (end - start) // 2 mid = (end - start) // 2
while len(array) > 0: while len(array) > 0:
if array[mid] == desired_num: if array[mid] == item:
return True return True
elif array[mid] > desired_num: elif array[mid] > item:
return bs(array[mid+1:], desired_num) return bs(array[mid + 1:], item)
else: else:
return bs(array[:mid], desired_num) return bs(array[:mid], item)
return False return False
@ -38,14 +35,16 @@ def find_pairs_max_sum(array, desired_sum):
i, j = 0, len(array) - 1 i, j = 0, len(array) - 1
while i < j: while i < j:
if array[i] + array[j] == desired_sum: this_sum = array[i] + array[j]
if this_sum == desired_sum:
return array[i], array[j] return array[i], array[j]
elif array[i] + array[j] > desired_sum: elif this_sum > desired_sum:
j = j - 1 j -= 1
elif array[i] + array[j] < desired_sum: else:
i = i + 1 i += 1
return False return False
def find_pairs_not_sorted(array, desired_sum): def find_pairs_not_sorted(array, desired_sum):