EasyNo. 2716
Minimize String Length — LeetCode 2716 Python Solution
- Pattern
- Hash Map
- Topics
- Hash Table, String
- Reading time
- 2 min
- Source
- leetcode.com
The problem
Given a string s, you have two types of operation: Choose an index i in the string, and let c be the character in position i. Delete the closest occurrence of c to the left of i (if exists).
Python solution
class Solution:
def minimizedStringLength(self, s: str) -> int:
return len(set(s))Complexity
- Time
- O(n), where n is the length of the string s
- Space · auxiliary
- O(|Σ|), where Σ is the character set
Pattern: Hash Map
Trade memory for time: remember what you have seen so the second pass never happens. LeetCode 2716. Minimize String Length is filed here on both counts: the reference solution below belongs to the algorithm family this hub collects, and LeetCode tags it Hash Table.
The hash map guide has the Python template for the pattern and the 709 LeetCode problems that use it.
Related problems
| No. | Problem | Difficulty |
|---|---|---|
| 2707 | Extra Characters in a String | Medium |
| 0003 | Longest Substring Without Repeating Characters | Medium |
| 0012 | Integer to Roman | Medium |
| 0013 | Roman to Integer | Easy |
| 0017 | Letter Combinations of a Phone Number | Medium |
| 0030 | Substring with Concatenation of All Words | Hard |
Frequently asked questions
- How hard is LeetCode 2716. Minimize String Length?
LeetCode 2716. Minimize String Length is rated Easy on LeetCode.
- What is the time complexity of LeetCode 2716. Minimize String Length?
The Python solution on this page runs in O(n), where n is the length of the string \textit{s}.
- What is the space complexity of LeetCode 2716. Minimize String Length?
The Python solution on this page uses O(|Σ|), where \Sigma is the character set auxiliary space.
- What topics does LeetCode 2716. Minimize String Length cover?
LeetCode 2716. Minimize String Length is tagged Hash Table and String on LeetCode.