Package g0401_0500.s0402_remove_k_digits

Class Solution

java.lang.Object
g0401_0500.s0402_remove_k_digits.Solution
public class Solution extends java.lang.Object
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:

  • 1 <= k <= num.length <= 105
  • num consists of only digits.
  • num does not have any leading zeros except for the zero itself.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.lang.String
    removeKdigits(java.lang.String num, int k)
     

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • removeKdigits

      public java.lang.String removeKdigits(java.lang.String num, int k)