Package g1001_1100.s1048_longest_string_chain

Class Solution

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public final class Solution

    1048 - Longest String Chain.

    Medium

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

    <code>word<sub>A</sub></code> is a predecessor of <code>word<sub>B</sub></code> if and only if we can insert exactly one letter anywhere in <code>word<sub>A</sub></code> without changing the order of the other characters to make it equal to <code>word<sub>B</sub></code>.

    • For example, "abc" is a predecessor of <code>"ab<ins>a</ins>c"</code>, while "cba" is not a predecessor of "bcad".

    A word chain is a sequence of words <code>word<sub>1</sub>, word<sub>2</sub>, ..., word<sub>k</sub></code> with k &gt;= 1, where <code>word<sub>1</sub></code> is a predecessor of <code>word<sub>2</sub></code>, <code>word<sub>2</sub></code> is a predecessor of <code>word<sub>3</sub></code>, 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","<ins>b</ins>a","b<ins>d</ins>a","bd<ins>c</ins>a".

    Example 2:

    Input: words = "xbc","pcxbcf","xb","cxbc","pcxbc"

    Output: 5

    Explanation: All the words can be put in a word chain "xb", "xb<ins>c</ins>", "<ins>c</ins>xbc", "<ins>p</ins>cxbc", "pcxbc<ins>f</ins>".

    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 &lt;= words.length &lt;= 1000

    • 1 &lt;= words[i].length &lt;= 16

    • words[i] only consists of lowercase English letters.

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Integer longestStrChain(Array<String> words)

      • Methods inherited from class java.lang.Object

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