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Remove K Digits
Medium Accuracy: 44.41% Submissions: 959 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 the smallest.

â€‹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
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|