2090. K Radius Subarray Averages
Medium
You are given a 0-indexed array nums
of n
integers, and an integer k
.
The k-radius average for a subarray of nums
centered at some index i
with the radius k
is the average of all elements in nums
between the indices i - k
and i + k
(inclusive). If there are less than k
elements before or after the index i
, then the k-radius average is -1
.
Build and return an array avgs
of length n
where avgs[i]
is the k-radius average for the subarray centered at index i
.
The average of x
elements is the sum of the x
elements divided by x
, using integer division. The integer division truncates toward zero, which means losing its fractional part.
For example, the average of four elements
2
,3
,1
, and5
is(2 + 3 + 1 + 5) / 4 = 11 / 4 = 2.75
, which truncates to2
.
Example 1:
Example 2:
Example 3:
Constraints:
n == nums.length
1 <= n <= 10^5
0 <= nums[i], k <= 10^5
解題
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