Maximum Value after Insertion
You are given a very large integer n, represented as a string, and an integer digit x.
You are given a very large integer n, represented as a string, and an integer digit x. The digits in n and the digit x are in the inclusive range [1, 9], and n may represent a negative number.
You want to maximize n's numerical value by inserting x anywhere in the decimal representation of n. You cannot insert x to the left of the negative sign.
Return a string representing the maximum value of n after the insertion.
Example 1
Input: n = "99", x = 9
Output: "999"
Explanation: The result is the same regardless of where you insert 9.
Example 2
Input: n = "-13", x = 2
Output: "-123"
Explanation: You can make n one of {-213, -123, -132}, and the largest of those three is -123.
Constraints
- 1 <= n.length <= 10^5
- 1 <= x <= 9
- The digits in n are in the range [1, 9].
- n is a valid representation of an integer.
- In the case of a negative n, it will begin with '-'.
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