连续子区间问题小结

最近做的一些连续子区间问题：

978.Longest Turbulent Subarray

https://leetcode.com/problems/longest-turbulent-subarray/description/

992.Subarrays with K Different Integers

https://leetcode.com/problems/subarrays-with-k-different-integers/description/

1438.Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

https://leetcode.com/problems/longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit/description/