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Remove K Digits
Medium Accuracy: 44.86% Submissions: 9074 Points: 4

Given a non-negative integer S represented as a string, remove K digits from the number so that the new number is the smallest possible.
Note : The given num does not contain any leading zero.

Example 1:

Input:
S = "149811", K = 3
Output: 111
Explanation: Remove the three digits
4, 9, and 8 to form the new number 111
which is smallest.


Example 2:

Input:
S = "1002991", K = 3
Output: 21
Explanation: Remove the three digits 1(leading
one), 9, and 9 to form the new number 21(Note
that the output must not contain leading
zeroes) which is the smallest.

You don't need to read input or print anything. Your task is to complete the function removeKdigits() which takes the string S and an integer K as input and returns the new number which is the smallest possible.

Expected Time Complexity: O(|S|).
Expected Auxiliary Space: O(|S|).

Constraints:
1<=|S|<=10002

1<=K<=|S|

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