376.[LeetCode]Wiggle Subsequence
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时间复杂度为 O(n),满足要求
public class Solution { public int wiggleMaxLength(int[] nums) { int size = nums.length; if(size == 0) return 0; if(size == 1) return 1; int count = 1; int current = 2; // 代表初状态 for(int i=1;i<size;i++){ if(nums[i] == nums[i-1]) continue; // 如果相等,则不计数 if(nums[i] > nums[i-1] && (current == 2 || current == 0)){ count++; current = 1; continue; } if(nums[i] < nums[i-1] && (current == 2 || current == 1)){ count++; current = 0; continue; } } return count; }}
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