Problem Submissions Solution
Remove Duplicates From A String
Difficulty: Easy
Acceptance: 61.68%
Points: 20.00
Given a string **str** that may contain both lowercase and uppercase letters, your task is to remove all duplicate characters from **str** while preserving the order of their first occurrence.
Examples:
Expected Time Complexity: O(N)
Expected Space Complexity: O(N)
Constraints:
- 1 <= N <= 10^5
- String contains uppercase and lowercase English letters.
Companies:
Amazon Microsoft Samsung Adobe TCS + 1 more
Topics:
String Stack
