mediumStringsPattern: Mixed
Longest Prefix Chain Length Solution
Problem Statement
Given a list of strings `messages` and a target string `target`, determine the length of the longest chain of strings where each string is a prefix of the next and the last string is `target`.
Examples
Example 1:
Input:{"messages":["a","ab","abc"],"target":"abc"}
Output:3
Example 2:
Input:{"messages":["abc","ab","a"],"target":"abc"}
Output:1
Constraints
- 2 <= number of messages <= 100
- 1 <= length of each message <= 10
- All messages are lowercase English letters.
Time: O(n^2) Space: O(n)
The optimized approach uses dynamic programming to store the length of the longest chain ending at each message, and then updates it based on whether a shorter message is a prefix of the current message, resulting in a time complexity of O(n^2).
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