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Given a sorted positive integer array nums and an integer n, add/patch elements to the array such that any number in range [1, n] inclusive can be formed by the sum of some elements in the array. Return the minimum number of patches required.
Example 1:
Input: nums = [1,3] , n = 6
Output: 1
Explanation:
Combinations of nums are [1], [3], [1,3] , which form possible sums of: 1, 3, 4 .
Now if we add/patch 2 to nums, the combinations are: [1], [2], [3], [1,3], [2,3], [1,2,3] .
Possible sums are 1, 2, 3, 4, 5, 6 , which now covers the range [1, 6] .
So we only need 1 patch.
Example 2:
Input: nums = [1,5,10] , n = 20
Output: 2
Explanation: The two patches can be [2, 4] .
Example 3:
Input: nums = [1,2,2] , n = 5
Output: 0
给定一个已排序的正整数数组 nums,和一个正整数 n 。从 [1, n] 区间内选取任意个数字补充到 nums 中,使得 [1, n] 区间内的任何数字都可以用 nums 中某几个数字的和来表示。请输出满足上述要求的最少需要补充的数字个数。
示例 1:
输入: nums = [1,3] , n = 6
输出: 1
解释:
根据 nums 里现有的组合 [1], [3], [1,3] ,可以得出 1, 3, 4 。
现在如果我们将 2 添加到 nums 中, 组合变为: [1], [2], [3], [1,3], [2,3], [1,2,3] 。
其和可以表示数字 1, 2, 3, 4, 5, 6 ,能够覆盖 [1, 6] 区间里所有的数。
所以我们最少需要添加一个数字。
示例 2:
输入: nums = [1,5,10] , n = 20
输出: 2
解释: 我们需要添加 [2, 4] 。
示例 3:
输入: nums = [1,2,2] , n = 5
输出: 0
52ms
1 class Solution {
2 func minPatches(_ nums: [Int], _ n: Int) -> Int {
3
4 var miss = 1
5 var res = 0
6 var i = 0
7 let l = nums.count
8 while miss <= n {
9 if i < l && nums[i] <= miss {
10 miss += nums[i]
11 i+=1
12 }else {
13 miss <<= 1
14 res += 1
15 }
16 }
17 return res
18 }
19 }
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