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Kotlin-based LeetCode algorithm problem solutions, regularly updated
664\. Strange Printer
Hard
There is a strange printer with the following two special properties:
* The printer can only print a sequence of **the same character** each time.
* At each turn, the printer can print new characters starting from and ending at any place and will cover the original existing characters.
Given a string `s`, return _the minimum number of turns the printer needed to print it_.
**Example 1:**
**Input:** s = "aaabbb"
**Output:** 2
**Explanation:** Print "aaa" first and then print "bbb".
**Example 2:**
**Input:** s = "aba"
**Output:** 2
**Explanation:** Print "aaa" first and then print "b" from the second place of the string, which will cover the existing character 'a'.
**Constraints:**
* `1 <= s.length <= 100`
* `s` consists of lowercase English letters.