Package g2101_2200.s2121_intervals_between_identical_elements

Class Solution

  • public class Solution
extends Object
    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
    • 1 <= n <= 105
    • 1 <= arr[i] <= 105

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • getDistances

        public long[] getDistances​(int[] arr)