## Largest 3-Same-Digit Number in String solution leetcode

You are given a string `num`

representing a large integer. An integer is **good** if it meets the following conditions:

- It is a
**substring**of`num`

with length`3`

. - It consists of only one unique digit.

Return *the maximum good integer as a string or an empty string *

`""`

*if no such integer exists*.

Note:

- A
**substring**is a contiguous sequence of characters within a string. - There may be
**leading zeroes**in`num`

or a good integer.

## Largest 3-Same-Digit Number in String solution leetcode

Input:num = "6133339"777Output:"777"Explanation:There are two distinct good integers: "777" and "333". "777" is the largest, so we return "777".

**Example 2:**

Input:num = "2319"000Output:"000"Explanation:"000" is the only good integer.

## Largest 3-Same-Digit Number in String solution leetcode

Input:num = "42352338"Output:""Explanation:No substring of length 3 consists of only one unique digit. Therefore, there are no good integers.

**Constraints:**

`3 <= num.length <= 1000`

`num`

only consists of digits.