Package g2401_2500.s2475_number_of_unequal_triplets_in_array

Class Solution

java.lang.Object
g2401_2500.s2475_number_of_unequal_triplets_in_array.Solution
public class Solution extends java.lang.Object
2475 - Number of Unequal Triplets in Array.

Easy

You are given a 0-indexed array of positive integers nums. Find the number of triplets (i, j, k) that meet the following conditions:

  • 0 <= i < j < k < nums.length
  • nums[i], nums[j], and nums[k] are pairwise distinct.
    • In other words, nums[i] != nums[j], nums[i] != nums[k], and nums[j] != nums[k].

Return the number of triplets that meet the conditions.

Example 1:

Input: nums = [4,4,2,4,3]

Output: 3

Explanation: The following triplets meet the conditions:

  • (0, 2, 4) because 4 != 2 != 3
  • (1, 2, 4) because 4 != 2 != 3
  • (2, 3, 4) because 2 != 4 != 3 Since there are 3 triplets, we return 3. Note that (2, 0, 4) is not a valid triplet because 2 > 0.

Example 2:

Input: nums = [1,1,1,1,1]

Output: 0

Explanation: No triplets meet the conditions so we return 0.

Constraints:

  • 3 <= nums.length <= 100
  • 1 <= nums[i] <= 1000

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    unequalTriplets(int[] nums)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • unequalTriplets

      public int unequalTriplets(int[] nums)