Package g1901_2000.s1946_largest_number_after_mutating_substring

Class Solution

java.lang.Object
g1901_2000.s1946_largest_number_after_mutating_substring.Solution
public class Solution extends java.lang.Object
1946 - Largest Number After Mutating Substring.

Medium

You are given a string num, which represents a large integer. You are also given a 0-indexed integer array change of length 10 that maps each digit 0-9 to another digit. More formally, digit d maps to digit change[d].

You may choose to mutate a single substring of num. To mutate a substring, replace each digit num[i] with the digit it maps to in change (i.e. replace num[i] with change[num[i]]).

Return a string representing the largest possible integer after mutating (or choosing not to) a single substring of num.

A substring is a contiguous sequence of characters within the string.

Example 1:

Input: num = “132”, change = [9,8,5,0,3,6,4,2,6,8]

Output: “832”

Explanation: Replace the substring “1”:

  • 1 maps to change[1] = 8. Thus, “132” becomes “832”.

“832” is the largest number that can be created, so return it.

Example 2:

Input: num = “021”, change = [9,4,3,5,7,2,1,9,0,6]

Output: “934”

Explanation: Replace the substring “021”:

  • 0 maps to change[0] = 9.

  • 2 maps to change[2] = 3.

  • 1 maps to change[1] = 4.

Thus, “021” becomes “934”.

“934” is the largest number that can be created, so return it.

Example 3:

Input: num = “5”, change = [1,4,7,5,3,2,5,6,9,4]

Output: “5”

Explanation: “5” is already the largest number that can be created, so return it.

Constraints:

  • 1 <= num.length <= 105
  • num consists of only digits 0-9.
  • change.length == 10
  • 0 <= change[d] <= 9

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.lang.String
    maximumNumber(java.lang.String num, int[] change)
     

    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

    • maximumNumber

      public java.lang.String maximumNumber(java.lang.String num, int[] change)