The K-th Lexicographical String Of All Happy Strings Of Length N
Generate all happy strings of length n in lexicographical order and return the k-th string. Use backtracking to build strings character by character, ensuring each new char is different from the previous one.
1415. The k-th Lexicographical String of All Happy Strings of Length n Difficulty: Medium Topics: String, Backtracking A happy string is a string that: consists only of letters of the set ['a', 'b', 'c']. s[i] != s[i + 1] for all values of i from 1 to s.length - 1 (string is 1-indexed). For example, strings "abc", "ac", "b" and "abcbabcbcb" are all happy strings and strings "aa", "baa" and "ababbc" are not happy strings. Given two integers n and k, consider a list of all happy strings of length n sorted in lexicographical order. Return the kth string of this list or return an empty string if...