# [Solution] Largest 3-Same-Digit Number in String solution leetcode

## 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: [Solution] Largest 3-Same-Digit Number in String solution leetcode

• substring is a contiguous sequence of characters within a string.
• There may be leading zeroes in `num` or a good integer.

## [Solution] Largest 3-Same-Digit Number in String solution leetcode

```Input: num = "6777133339"
Output: "777"
Explanation: There are two distinct good integers: "777" and "333".
"777" is the largest, so we return "777".
```

Example 2:

```Input: num = "2300019"
Output: "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: [Solution] Largest 3-Same-Digit Number in String solution leetcode

• `3 <= num.length <= 1000`
• `num` only consists of digits.