May LeetCoding Challenge[Day13] - 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. 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. 1..