二分查找

[python]代码库

def binary_search(arr, target):
    low = 0
    high = len(arr) - 1

    while low <= high:
        mid = (low + high) // 2
        if arr[mid] == target:
            return mid
        elif arr[mid] < target:
            low = mid + 1
        else:
            high = mid - 1

    return -1


arr = [64, 25, 12, 66, 99, 22, 11]
print(binary_search(arr, 66))