https://leetcode.com/problems/remove-k-digits/

Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible.

Note:

The length of num is less than 10002 and will be ≥ k.

The given num does not contain any leading zero.

Example 1:

Input: num = “1432219”, k = 3

Output: “1219”

Explanation: Remove the three digits 4, 3, and 2 to form the new number 1219 which is the smallest.

Example 2:

Input: num = “10200”, k = 1

Output: “200”

Explanation: Remove the leading 1 and the number is 200. Note that the output must not contain leading zeroes.

Example 3:

Input: num = “10”, k = 2

Output: “0”

Explanation: Remove all the digits from the number and it is left with nothing which is 0.

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