Largest 3-Same-Digit Number in String — LeetCode 2264 Python Solution

The problem

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.

Example

Input

num = "6777133339"

Output

"777"

Explanation

There are two distinct good integers: "777" and "333".

Python solution

class Solution:
    def largestGoodInteger(self, num: str) -> str:
        for i in range(9, -1, -1):
            if (s := str(i) * 3) in num:
                return s
        return ""

Complexity

Pattern: Hash Map

Trade memory for time: remember what you have seen so the second pass never happens. LeetCode 2264. Largest 3-Same-Digit Number in String is filed here because the reference solution below belongs to the algorithm family this hub collects, even though its LeetCode tags point elsewhere.

The hash map guide has the Python template for the pattern and the 709 LeetCode problems that use it.

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