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[Swift]LeetCode1144. 递减元素使数组呈锯齿状 | Decrease Elements To Make Array Zigzag

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Given an array nums of integers, a move consists of choosing any element and decreasing it by 1.

An array A is a zigzag array if either:

  • Every even-indexed element is greater than adjacent elements, ie. A[0] > A[1] < A[2] > A[3] < A[4] > ...
  • OR, every odd-indexed element is greater than adjacent elements, ie. A[0] < A[1] > A[2] < A[3] > A[4] < ...

Return the minimum number of moves to transform the given array nums into a zigzag array. 

Example 1:

Input: nums = [1,2,3]
Output: 2
Explanation: We can decrease 2 to 0 or 3 to 1.

Example 2:

Input: nums = [9,6,1,6,2]
Output: 4 

Constraints:

  • 1 <= nums.length <= 1000
  • 1 <= nums[i] <= 1000

给你一个整数数组 nums,每次 操作 会从中选择一个元素并 将该元素的值减少 1。

如果符合下列情况之一,则数组 A 就是 锯齿数组:

  • 每个偶数索引对应的元素都大于相邻的元素,即 A[0] > A[1] < A[2] > A[3] < A[4] > ...
  • 或者,每个奇数索引对应的元素都大于相邻的元素,即 A[0] < A[1] > A[2] < A[3] > A[4] < ...

返回将数组 nums 转换为锯齿数组所需的最小操作次数。 

示例 1:

输入:nums = [1,2,3]
输出:2
解释:我们可以把 2 递减到 0,或把 3 递减到 1。

示例 2:

输入:nums = [9,6,1,6,2]
输出:4 

提示:

  • 1 <= nums.length <= 1000
  • 1 <= nums[i] <= 1000

Runtime: 8 ms Memory Usage: 20.8 MB
 1 class Solution {
 2     func movesToMakeZigzag(_ nums: [Int]) -> Int {
 3         var n:Int = nums.count
 4         var j:Int = 0
 5         var s:Int = 0
 6         var t:Int = 0
 7         for i in stride(from:0,to:n,by:2)
 8         {
 9             j = 0
10             if i != 0
11             {
12                 j = max(j,nums[i]-nums[i-1]+1)
13             }
14             if i + 1 < n
15             {
16                 j = max(j,nums[i]-nums[i+1]+1)
17             }
18             s += j
19         }
20         for i in stride(from:1,to:n,by:2)
21         {
22             j = 0
23             if i != 0
24             {
25                 j = max(j,nums[i]-nums[i-1]+1)
26             }
27             if i + 1 < n
28             {
29                 j = max(j,nums[i]-nums[i+1]+1)
30             }
31             t += j
32         }
33         return min(s,t)       
34     }
35 }
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