1262. Greatest Sum Divisible by Three

https://leetcode.com/problems/greatest-sum-divisible-by-three

Description

Given an array nums of integers, we need to find the maximum possible sum of elements of the array such that it is divisible by three.

Example 1:

**Input:** nums = [3,6,5,1,8]
**Output:** 18
**Explanation:** Pick numbers 3, 6, 1 and 8 their sum is 18 (maximum sum divisible by 3).

Example 2:

**Input:** nums = [4]
**Output:** 0
**Explanation:** Since 4 is not divisible by 3, do not pick any number.

Example 3:

**Input:** nums = [1,2,3,4,4]
**Output:** 12
**Explanation:** Pick numbers 1, 3, 4 and 4 their sum is 12 (maximum sum divisible by 3).

Constraints:

• 1 <= nums.length <= 4 * 10^4

• 1 <= nums[i] <= 10^4

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