Package g0401_0500.s0402_remove_k_digits

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    402 - Remove K Digits.

    Medium

    Given string num representing a non-negative integer num, and an integer k, return the smallest possible integer after removing k digits from num.

    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.

    Constraints:

    • <code>1 <= k <= num.length <= 10<sup>5</sup></code>

    • num consists of only digits.

    • num does not have any leading zeros except for the zero itself.

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final String removeKdigits(String num, Integer k)

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait