Given an array consisting of n integers, find the contiguous subarray whose length is greater than or equal to k that has the maximum average value. And you need to output the maximum average value.
Example 1:
Input: [1,12,-5,-6,50,3], k = 4 Output: 12.75 Explanation: when length is 5, maximum average value is 10.8, when length is 6, maximum average value is 9.16667. Thus return 12.75.
Note:
- 1 <=
k<=n<= 10,000. - Elements of the given array will be in range [-10,000, 10,000].
- The answer with the calculation error less than 10-5 will be accepted.