2121 - Intervals Between Identical Elements.

Medium

You are given a 0-indexed array of n integers arr.

The interval between two elements in arr is defined as the absolute difference between their indices. More formally, the interval between arr[i] and arr[j] is |i - j|.

Return an array intervals of length n where intervals[i] is the sum of intervals between arr[i] and each element in arr with the same value as arr[i].

Note: |x| is the absolute value of x.

Example 1:

Input: arr = 2,1,3,1,2,3,3

Output: 4,2,7,2,4,4,5

Explanation:

• Index 0: Another 2 is found at index 4. |0 - 4| = 4

• Index 1: Another 1 is found at index 3. |1 - 3| = 2

• Index 2: Two more 3s are found at indices 5 and 6. |2 - 5| + |2 - 6| = 7

• Index 3: Another 1 is found at index 1. |3 - 1| = 2

• Index 4: Another 2 is found at index 0. |4 - 0| = 4

• Index 5: Two more 3s are found at indices 2 and 6. |5 - 2| + |5 - 6| = 4

• Index 6: Two more 3s are found at indices 2 and 5. |6 - 2| + |6 - 5| = 5

Example 2:

Input: arr = 10,5,10,10

Output: 5,0,3,4

Explanation:

• Index 0: Two more 10s are found at indices 2 and 3. |0 - 2| + |0 - 3| = 5

• Index 1: There is only one 5 in the array, so its sum of intervals to identical elements is 0.

• Index 2: Two more 10s are found at indices 0 and 3. |2 - 0| + |2 - 3| = 3

• Index 3: Two more 10s are found at indices 0 and 2. |3 - 0| + |3 - 2| = 4

Constraints:

• n == arr.length

• <code>1 <= n <= 10⁵</code>

• <code>1 <= arri<= 10⁵</code>