Expressive Words
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". Ifs = "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
1We can extend "e" and "o" in the word "hello" to get "heeellooo", while the other words cannot be extended to match
s.Example 2
Input
s = "zzzzzyyyyy", words = ["zzyy","zy","zyy"]Output
3Each query word can be extended by increasing its character groups to match
"zzzzzyyyyy".Constraints
- 1 <= s.length, words.length <= 100
- 1 <= words[i].length <= 100
- s and words[i] consist of lowercase letters.