g2301_2400.s2370_longest_ideal_subsequence

Class Solution

java.lang.Object

g2301_2400.s2370_longest_ideal_subsequence.Solution

public class Solution
extends Object

2370 - Longest Ideal Subsequence.

Medium

You are given a string s consisting of lowercase letters and an integer k. We call a string t ideal if the following conditions are satisfied:

• t is a subsequence of the string s.
• The absolute difference in the alphabet order of every two adjacent letters in t is less than or equal to k.

Return the length of the longest ideal string.

A subsequence is a string that can be derived from another string by deleting some or no characters without changing the order of the remaining characters.

Note that the alphabet order is not cyclic. For example, the absolute difference in the alphabet order of 'a' and 'z' is 25, not 1.

Example 1:

Input: s = “acfgbd”, k = 2

Output: 4

Explanation: The longest ideal string is “acbd”. The length of this string is 4, so 4 is returned. Note that “acfgbd” is not ideal because ‘c’ and ‘f’ have a difference of 3 in alphabet order.

Example 2:

Input: s = “abcd”, k = 3

Output: 4

Explanation: The longest ideal string is “abcd”. The length of this string is 4, so 4 is returned.

Constraints:

• 1 <= s.length <= 105
• 0 <= k <= 25
• s consists of lowercase English letters.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	longestIdealString(String s, int k)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

longestIdealString

public int longestIdealString(String s,
                              int k)