g1001_1100.s1048_longest_string_chain

Class Solution

java.lang.Object

g1001_1100.s1048_longest_string_chain.Solution

public class Solution
extends Object

1048 - Longest String Chain.

Medium

You are given an array of words where each word consists of lowercase English letters.

wordA is a predecessor of wordB if and only if we can insert exactly one letter anywhere in wordA without changing the order of the other characters to make it equal to wordB.

• For example, "abc" is a predecessor of "abac", while "cba" is not a predecessor of "bcad".

A word chain is a sequence of words [word1, word2, …, wordk] with k >= 1, where word1 is a predecessor of word2, word2 is a predecessor of word3, and so on. A single word is trivially a word chain with k == 1.

Return the length of the longest possible word chain with words chosen from the given list of words.

Example 1:

Input: words = [“a”,“b”,“ba”,“bca”,“bda”,“bdca”]

Output: 4

Explanation: One of the longest word chains is [“a”,“ba”,“bda”,“bdca”].

Example 2:

Input: words = [“xbc”,“pcxbcf”,“xb”,“cxbc”,“pcxbc”]

Output: 5

Explanation: All the words can be put in a word chain [“xb”, “xbc”, “cxbc”, “pcxbc”, “pcxbcf”].

Example 3:

Input: words = [“abcd”,“dbqca”]

Output: 1

Explanation: The trivial word chain [“abcd”] is one of the longest word chains. [“abcd”,“dbqca”] is not a valid word chain because the ordering of the letters is changed.

Constraints:

• 1 <= words.length <= 1000
• 1 <= words[i].length <= 16
• words[i] only consists of lowercase English letters.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	findLongest(String word, List<String>[] lenStr, Map<String,Integer> longest)
int	longestStrChain(String[] words)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

longestStrChain

public int longestStrChain(String[] words)

findLongest

public int findLongest(String word,
                       List<String>[] lenStr,
                       Map<String,Integer> longest)