Package g0801_0900.s0809_expressive_words

Class Solution

  • public class Solution
extends Object
    809 - Expressive Words.

    Medium

    Sometimes people repeat letters to represent extra feeling. For example:

    • "hello" -> "heeellooo"
    • "hi" -> "hiiii"

    In these strings like "heeellooo", we have groups of adjacent letters that are all the same: "h", "eee", "ll", "ooo".

    You are given a string s and an array of query strings words. A query word is stretchy if it can be made to be equal to s by any number of applications of the following extension operation: choose a group consisting of characters c, and add some number of characters c to the group so that the size of the group is three or more.

    • For example, starting with "hello", we could do an extension on the group "o" to get "hellooo", but we cannot get "helloo" since the group "oo" has a size less than three. Also, we could do another extension like "ll" -> "lllll" to get "helllllooo". If s = "helllllooo", then the query word "hello" would be stretchy because of these two extension operations: query = "hello" -> "hellooo" -> "helllllooo" = s.

    Return the number of query strings that are stretchy.

    Example 1:

    Input: s = “heeellooo”, words = [“hello”, “hi”, “helo”]

    Output: 1

    Explanation:

    We can extend “e” and “o” in the word “hello” to get “heeellooo”.

    We can’t extend “helo” to get “heeellooo” because the group “ll” is not size 3 or more.

    Example 2:

    Input: s = “zzzzzyyyyy”, words = [“zzyy”,“zy”,“zyy”]

    Output: 3

    Constraints:

    • 1 <= s.length, words.length <= 100
    • 1 <= words[i].length <= 100
    • s and words[i] consist of lowercase letters.

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • expressiveWords

        public int expressiveWords​(String s,
                           String[] words)