Longest String Chain LeetCode Solution

Problem – Longest String Chain

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".

word chain is a sequence of words [word1, word2, ..., wordk] with k >= 1, where word1 is a predecessor of word2word2 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.

Longest String Chain LeetCode Solution in Python

    def longestStrChain(self, words):
        dp = {}
        for w in sorted(words, key=len):
            dp[w] = max(dp.get(w[:i] + w[i + 1:], 0) + 1 for i in xrange(len(w)))
        return max(dp.values())

Longest String Chain LeetCode Solution in C++

    static bool compare(const string &s1, const string &s2) {
        return s1.length() < s2.length();
    }

    int longestStrChain(vector<string>& words) {
        sort(words.begin(), words.end(), compare);
        unordered_map<string, int> dp;
        int res = 0;
        for (string w : words) {
            for (int i = 0; i < w.length(); i++) {
                string pre = w.substr(0, i) + w.substr(i + 1);
                dp[w] = max(dp[w], dp.find(pre) == dp.end() ? 1 : dp[pre] + 1);
            }
            res = max(res, dp[w]);
        }
        return res;
    }

Longest String Chain LeetCode Solution in Java

    public int longestStrChain(String[] words) {
        Map<String, Integer> dp = new HashMap<>();
        Arrays.sort(words, (a, b)->a.length() - b.length());
        int res = 0;
        for (String word : words) {
            int best = 0;
            for (int i = 0; i < word.length(); ++i) {
                String prev = word.substring(0, i) + word.substring(i + 1);
                best = Math.max(best, dp.getOrDefault(prev, 0) + 1);
            }
            dp.put(word, best);
            res = Math.max(res, best);
        }
        return res;
    }
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