mirror of
https://github.com/onyx-and-iris/grokking-algorithms.git
synced 2024-11-15 17:30:52 +00:00
43 lines
813 B
Python
43 lines
813 B
Python
import logging
|
|
import random
|
|
import time
|
|
|
|
logging.basicConfig(level=logging.DEBUG)
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
def binary_search(arr, item):
|
|
low = 0
|
|
high = len(arr) - 1
|
|
|
|
while low <= high:
|
|
mid = (low + high) // 2
|
|
guess = arr[mid]
|
|
if guess == item:
|
|
return mid
|
|
elif guess > item:
|
|
high = mid - 1
|
|
else:
|
|
low = mid + 1
|
|
|
|
return None
|
|
|
|
|
|
LOWER = 1000
|
|
UPPER = 1000000
|
|
SAMPLE_SIZE = 1000
|
|
|
|
|
|
numbers = random.sample(range(LOWER, UPPER), SAMPLE_SIZE)
|
|
numbers.sort()
|
|
|
|
start = time.time()
|
|
result = None
|
|
while result is None:
|
|
guess = random.randrange(LOWER, UPPER)
|
|
logger.debug(f"guess: {guess}")
|
|
result = binary_search(numbers, guess)
|
|
|
|
|
|
print(f"Found {guess} at index {result}. Running time {time.time() - start}")
|