函数def find_max(arr, low, high): 计算数组中最大元素，其中数组arr从索引low到high，（ ）正确实现了分治逻辑。

def find_max(arr, low, high):
    if low = high:
        return arr[low]
    mid = low + (high - low) // 2
    left_max = find_max(arr, low, mid)
    right_max = find_max(arr, mid, high)
    return left_max if left_max > right_max else right_max

def find_max(arr, low, high):
    if low == high:
        return arr[low]
    mid = low + (high - low) // 2
    left_max = find_max(arr, low, mid)
    right_max = find_max(arr, mid, high)
    return left_max if left_max > right_max else right_max

def find_max(arr, low, high):
    if low == high:
        return arr[low]
    mid = low + (high - low) // 2
    left_max = find_max(arr, low, mid)
    right_max = find_max(arr, mid - 1, high)
    return left_max if left_max > right_max else right_max

def find_max(arr, low, high):
    if low == high:
        return arr[low]
    mid = low + (high - low) // 2
    left_max = find_max(arr, low, mid)
    right_max = find_max(arr, mid + 1, high)
    return left_max if left_max > right_max else right_max