Grokking the Coding Interview: Patterns for Coding Questions
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Remove K Digits (hard)
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Problem Statement

Given a non-negative integer represented as a string num and an integer k, delete k digits from num to obtain the smallest possible integer. Return this minimum possible integer as a string.

Examples

    • Input: num = "1432219", k = 3
    • Output: "1219"
    • Explanation: The digits removed are 4, 3, and 2 forming the new number 1219 which is the smallest.
    • Input: num = "10200", k = 1
    • Output: "200"
    • Explanation: Removing the leading 1 forms the smallest number 200.
    • Input: num = "1901042", k = 4
    • Output: "2"
    • Explanation: Removing 1, 9, 1, and 4 forms the number 2 which is the smallest possible. Constraints:
  • 1 <= k <= num.length <= 10<sup>5</sup>
  • num consists of only digits.
  • num does not have any leading zeros except for the zero itself.

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Python3
Python3
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