algorithm/tech-interview-handbook
1
0
Fork 0
mirror of https://github.com/yangshun/tech-interview-handbook.git synced 2025-07-30 05:34:33 +08:00
Code Issues Packages Projects Releases Wiki Activity

Return -1 if target is not in array (#9)

Browse Source 
* return -1 if target is not in array

* return -1 if target is not in array (python)

* <= in binary search while loop
This commit is contained in:
Austin Green
2017-09-30 09:51:37 -04:00
committed by Yangshun Tay
parent ae70816718
commit 4fa28c04ee
2 changed files with 14 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
utilities/python/binary_search.py
View File

@ -1,7 +1,7 @@
def binary_search(arr, target):
left = 0;
right = len(arr) - 1
while left < right:
while left <= right:
mid = left + (right - left) // 2;
if arr[mid] == target:
return mid
@ -9,14 +9,14 @@ def binary_search(arr, target):
left = mid + 1
else:
right = mid - 1
return left
return -1
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)
print(binary_search([1, 2, 3, 10], 9) == -1)
print(binary_search([1, 2, 3, 10], 4) == -1)
print(binary_search([1, 2, 3, 10], 0) == -1)
print(binary_search([1, 2, 3, 10], 11) == -1)
print(binary_search([5, 7, 8, 10], 3) == -1)