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Minimize string value
Basic Accuracy: 31.59% Submissions: 834 Points: 1

Given a string of lowercase alphabets and a number k, the task is to find the minimum value of the string after removal of ‘k’ characters. 
The value of a string is defined as the sum of squares of the count of each distinct character.
For example consider the string “geeks”, here frequencies of characters are g -> 1, e -> 2, k -> 1,
s -> 1 and value of the string is 12 + 22 + 12 + 12 = 7
 

Example 1:

Input: S = "abccc", K = 1
Output: 6
Explanation: Remove one 'c', then frequency
will be a -> 1, b -> 1, c -> 2.
12 + 12 + 22 = 6

​Example 2:

Input: S = "aaab", K = 2
Output: 2
Explanation: Remove 2 'a's, then frequency
will be a -> 1, b -> 1.
12 + 12 = 2

Your Task:  
You don't need to read input or print anything. Your task is to complete the function minValue() which takes the string as inputs and returns the answer.

Expected Time Complexity: O(K*log(|S|))
Expected Auxiliary Space: O(constant)

Constraints:
1 ≤ K, |S| ≤ 104

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Minimize string value

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