3403. Find the Lexicographically Largest String From the Box I | Leetcode | C++ | Java

3403. Find the Lexicographically Largest String From the Box I | Sliding window | C++ | Java

In this video, we solve LeetCode 3403 – a fun and logical string problem based on finding the lexicographically largest string after generating all unique split combinations.

💬 Problem Statement:
You are given a string word and an integer numFriends.
In each round of the game:
You split word into numFriends non-empty strings.
All unique splits are considered.
All split parts are put into a box.
Your goal?
👉 Find the lexicographically largest string among all strings ever placed in the box.

🧠 Approach:
🔍 Key Insight:
If you split word into numFriends parts, then at most, the first part of any split can be up to n - numFriends + 1 characters long.
This is because each of the remaining numFriends - 1 parts must contain at least one character.
✅ So, you:
Slide a window of size (n - numFriends + 1) over the string.
Collect every such substring and track the maximum (i.e., the lexicographically largest one).

🧠 Time Complexity: O(n*n)
🧠 Space Complexity: O(1) (excluding answer storage)

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00:00 - Intro
00:18 - Problem Explanation
05:15 - Optimal Approach
12:20 - Code explanation
14:18 - Code dry run
17:50 - Code Submission

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