Longest Word in Dictionary

**Problem Statement:** Given the required input arguments, write an efficient algorithm to solve the **Longest Word in Dictionary** problem. Implement the required logic as specified by standard definitions for this classic algorithmic challenge. **Hint / Expected Approach:** Insert all, DFS/BFS checking each prefix present **Edge Cases to Consider:** - (1) Multiple same-length valid words - (2) Single word - (3) Word with all prefixes missing

Examples

Example 1

Input: ["w","wo","wor","worl","world"]

Output: "world"

Explanation: Full chain

Example 2

Input: ["a","banana","app","appl","ap","apply","apple"]

Output: "apple"

Explanation: Shorter or lex first if tie

Example 3

Input: ["a"]

Output: "a"

Explanation: Single

Constraints

▪Input arguments are within valid ranges
▪Optimize for execution speed
▪Handle null/empty inputs gracefully

Watch Out For Edge Cases

▪Multiple same-length valid words
▪Single word
▪Word with all prefixes missing

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