Package g1501_1600.s1588_sum_of_all_odd_length_subarrays

Class Solution

java.lang.Object
g1501_1600.s1588_sum_of_all_odd_length_subarrays.Solution
public class Solution extends java.lang.Object
1588 - Sum of All Odd Length Subarrays.

Easy

Given an array of positive integers arr, calculate the sum of all possible odd-length subarrays.

A subarray is a contiguous subsequence of the array.

Return _the sum of all odd-length subarrays of _arr.

Example 1:

Input: arr = [1,4,2,5,3]

Output: 58

Explanation: The odd-length subarrays of arr and their sums are:

[1] = 1

[4] = 4

[2] = 2

[5] = 5

[3] = 3

[1,4,2] = 7

[4,2,5] = 11

[2,5,3] = 10

[1,4,2,5,3] = 15

If we add all these together we get 1 + 4 + 2 + 5 + 3 + 7 + 11 + 10 + 15 = 58

Example 2:

Input: arr = [1,2]

Output: 3

Explanation: There are only 2 subarrays of odd length, [1] and [2]. Their sum is 3.

Example 3:

Input: arr = [10,11,12]

Output: 66

Constraints:

  • 1 <= arr.length <= 100
  • 1 <= arr[i] <= 1000

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    sumOddLengthSubarrays(int[] arr)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • sumOddLengthSubarrays

      public int sumOddLengthSubarrays(int[] arr)