Twitter Online Assessment (OA) - Unique Twitter User ID Set

Given an array of integers l with size n, write a function that determines the minimum sum of another array l_unique with size n such that:

• l[i] <= l_unique[i] for all 0 <= i < n;
• l_unique[i] != l_unique[j] for all 0 <= i != j < n.

Example 1:

Input: l = [3, 2, 1, 2, 7]

Output: 17

Explanation: In this case, one l_unique could be [3, 2, 1, 4, 7], and the sum of this array is equal to 3 + 2 + 1 + 4 + 7 = 17.

Constraints:

• 1 <= n <= 2000
• 1 <= l[i] <= 3000 for all 0 <= i < n

Try it yourself

Solution