Fri. Apr 12th, 2024

# LeetCode – Strings – Remove Palindromic Subsequence

#### ByKnight Coderz

Apr 4, 2020

Given a string `s` consisting only of letters `'a'` and `'b'`. In a single step you can remove one palindromic subsequence from `s`.

Return the minimum number of steps to make the given string empty.

A string is a subsequence of a given string, if it is generated by deleting some characters of a given string without changing its order.

A string is called palindrome if is one that reads the same backward as well as forward.

Example 1:

```Input: s = "ababa"
Output: 1
```

Example 2:

```Input: s = "abb"
Output: 2
Explanation: "abb" -> "bb" -> "".
Remove palindromic subsequence "a" then "bb".
```

Example 3:

```Input: s = "baabb"
Output: 2
Explanation: "baabb" -> "b" -> "".
Remove palindromic subsequence "baab" then "b".
```

Example 4:

```Input: s = ""
Output: 0```
``class Solution {    public int removePalindromeSub(String s) {        if(s.length() == 0) return 0;        StringBuilder sb = new StringBuilder(s);        if(sb.reverse().toString().equals(s)) return 1;        return 2;    }}``