You are given a string s and an array of strings words. You should add a closed pair of bold tag <b> and </b> to wrap the substrings in s that exist in words. If two such substrings overlap, you should wrap them together with only one pair of closed bold-tag. If two substrings wrapped by bold tags are consecutive, you should combine them.
Return s after adding the bold tags.
Given a string s, consider all duplicated substrings: (contiguous) substrings of s that occur 2 or more times. The occurrences may overlap.
Return any duplicated substring that has the longest possible length. If s does not have a duplicated substring, the answer is "".
Design an algorithm to encode a list of strings to a string. The encoded string is then sent over the network and is decoded back to the original list of strings.
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.
"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.
Give a binary string s, return the number of non-empty substrings that have the same number of 0‘s and 1‘s, and all the 0‘s and all the 1‘s in these substrings are grouped consecutively.
Substrings that occur multiple times are counted the number of times they occur.