[Coding] Find Triangular Sum of an Array solution leetcode

You are given a 0-indexed integer array nums, where nums[i] is a digit between 0 and 9 (inclusive).

The triangular sum of nums is the value of the only element present in nums after the following process terminates:

  1. Let nums comprise of n elements. If n == 1end the process. Otherwise, create a new 0-indexed integer array newNums of length n - 1.
  2. For each index i, where 0 <= i < n - 1assign the value of newNums[i] as (nums[i] + nums[i+1]) % 10, where % denotes modulo operator.
  3. Replace the array nums with newNums.
  4. Repeat the entire process starting from step 1.

Return the triangular sum of nums.

[Coding] Find Triangular Sum of an Array solution leetcode

Find Triangular Sum of an Array solution leetcode
Input: nums = [1,2,3,4,5]
Output: 8
Explanation:
The above diagram depicts the process from which we obtain the triangular sum of the array.

[Coding] Find Triangular Sum of an Array solution leetcode

Input: nums = [5]
Output: 5
Explanation:
Since there is only one element in nums, the triangular sum is the value of that element itself.

[Coding] Find Triangular Sum of an Array solution leetcode

  • 1 <= nums.length <= 1000
  • 0 <= nums[i] <= 9

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