26 lines
732 B
Python
26 lines
732 B
Python
#!/usr/bin/env python
|
|
|
|
import random
|
|
|
|
def binary_search(arr, lb, ub, target):
|
|
"""
|
|
A Binary Search Example which has O(log n) time complexity.
|
|
"""
|
|
if lb <= ub:
|
|
mid = ub + lb // 2
|
|
if arr[mid] == target:
|
|
return mid
|
|
elif arr[mid] < target:
|
|
return binary_search(arr, mid + 1, ub, target)
|
|
else:
|
|
return binary_search(arr, lb, mid - 1, target)
|
|
else:
|
|
return -1
|
|
|
|
if __name__ == '__main__':
|
|
rand_num_li = sorted([random.randint(1, 50) for _ in range(10)])
|
|
target = random.randint(1, 50)
|
|
print("List: {}\nTarget: {}\nIndex: {}".format(
|
|
rand_num_li, target,
|
|
binary_search(rand_num_li, 0, len(rand_num_li) - 1, target)))
|