public class Solution
extends Object
1331 - Rank Transform of an Array\.
Easy
Given an array of integers `arr`, replace each element with its rank.
The rank represents how large the element is. The rank has the following rules:
* Rank is an integer starting from 1.
* The larger the element, the larger the rank. If two elements are equal, their rank must be the same.
* Rank should be as small as possible.
**Example 1:**
**Input:** arr = [40,10,20,30]
**Output:** [4,1,2,3]
**Explanation:** 40 is the largest element. 10 is the smallest. 20 is the second smallest. 30 is the third smallest.
**Example 2:**
**Input:** arr = [100,100,100]
**Output:** [1,1,1]
**Explanation:** Same elements share the same rank.
**Example 3:**
**Input:** arr = [37,12,28,9,100,56,80,5,12]
**Output:** [5,3,4,2,8,6,7,1,3]
**Constraints:**
* 0 <= arr.length <= 105
* -109 <= arr[i] <= 109