LeetCode-674：Longest Continuous Increasing Subsequence （最长连续增序列）

Question

Given an unsorted array of integers, find the length of longest continuous increasing subsequence.

Example 1:

Input: [1,3,5,4,7]Output: 3Explanation: The longest continuous increasing subsequence is [1,3,5], its length is 3. Even though [1,3,5,7] is also an increasing subsequence, it's not a continuous one where 5 and 7 are separated by 4. 

Example 2:

Input: [2,2,2,2,2]Output: 1Explanation: The longest continuous increasing subsequence is [2], its length is 1. 

Note: Length of the array will not exceed 10,000.

问题解析：

给定数组，找到其中最长的连续递增的子数组序列，连续相等不算递增。

Answer

Solution 1：

遍历实现。

• 题目比较简单，通过记录最小和最大索引位置和当前最大长度，遍历实现即可。

class Solution {    public int findLengthOfLCIS(int[] nums) {        if (nums == null || nums.length == 0) return 0;        int maxlength = 1;        int left = 0;        int right = 0;        for (int i = 0; i < nums.length-1; i++){            if (nums[i] < nums[i+1]){                right++;                maxlength = Math.max(maxlength, right-left+1);            }else{                left = right = i+1;            }        }        return maxlength;    }}

• 时间复杂度：O(n)，空间复杂度：O(1)