题目：
题解：
class Solution:
def minPatches(self, nums: List[int], n: int) -> int:
patches, x = 0, 1
length, index = len(nums), 0
while x <= n:
if index < length and nums[index] <= x:
x += nums[index]
index += 1
else:
x <<= 1
patches += 1
return patches
