Class Solution
- java.lang.Object
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- g2001_2100.s2090_k_radius_subarray_averages.Solution
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public class Solution extends Object
2090 - K Radius Subarray Averages.Medium
You are given a 0-indexed array
nums
ofn
integers, and an integerk
.The k-radius average for a subarray of
nums
centered at some indexi
with the radiusk
is the average of all elements innums
between the indicesi - k
andi + k
( inclusive ). If there are less thank
elements before or after the indexi
, then the k-radius average is-1
.Build and return an array
avgs
of lengthn
whereavgs[i]
is the k-radius average for the subarray centered at indexi
.The average of
x
elements is the sum of thex
elements divided byx
, 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:
Input: nums = [7,4,3,9,1,8,5,2,6], k = 3
Output: [-1,-1,-1,5,4,4,-1,-1,-1]
Explanation:
-
avg[0], avg[1], and avg[2] are -1 because there are less than k elements before each index.
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The sum of the subarray centered at index 3 with radius 3 is: 7 + 4 + 3 + 9 + 1 + 8 + 5 = 37.
Using integer division , avg[3] = 37 / 7 = 5.
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For the subarray centered at index 4, avg[4] = (4 + 3 + 9 + 1 + 8 + 5 + 2) / 7 = 4.
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For the subarray centered at index 5, avg[5] = (3 + 9 + 1 + 8 + 5 + 2 + 6) / 7 = 4.
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avg[6], avg[7], and avg[8] are -1 because there are less than k elements after each index.
Example 2:
Input: nums = [100000], k = 0
Output: [100000]
Explanation:
-
The sum of the subarray centered at index 0 with radius 0 is: 100000.
avg[0] = 100000 / 1 = 100000.
Example 3:
Input: nums = [8], k = 100000
Output: [-1]
Explanation:
- avg[0] is -1 because there are less than k elements before and after index 0.
Constraints:
n == nums.length
1 <= n <= 105
0 <= nums[i], k <= 105
- For example, the average of four elements
-
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Constructor Summary
Constructors Constructor Description Solution()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int[]
getAverages(int[] nums, int k)
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