public class Solution
extends Object
1013 - Partition Array Into Three Parts With Equal Sum\.
Easy
Given an array of integers `arr`, return `true` if we can partition the array into three **non-empty** parts with equal sums.
Formally, we can partition the array if we can find indexes `i + 1 < j` with `(arr[0] + arr[1] + ... + arr[i] == arr[i + 1] + arr[i + 2] + ... + arr[j - 1] == arr[j] + arr[j + 1] + ... + arr[arr.length - 1])`
**Example 1:**
**Input:** arr = [0,2,1,-6,6,-7,9,1,2,0,1]
**Output:** true
**Explanation:** 0 + 2 + 1 = -6 + 6 - 7 + 9 + 1 = 2 + 0 + 1
**Example 2:**
**Input:** arr = [0,2,1,-6,6,7,9,-1,2,0,1]
**Output:** false
**Example 3:**
**Input:** arr = [3,3,6,5,-2,2,5,1,-9,4]
**Output:** true
**Explanation:** 3 + 3 = 6 = 5 - 2 + 2 + 5 + 1 - 9 + 4
**Constraints:**
* 3 <= arr.length <= 5 * 104
* -104 <= arr[i] <= 104