#1603Medium#41 in D. E. Shaw's list· asked at 8 companies
Remove Duplicate Letters
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What we know
Example 1
Input: s = "bcabc" Output: "abc"
Example 2
Input: s = "cbacdcbc" Output: "acdb"
Constraints
- •
1 <= s.length <= 10^4 - •
sconsists of lowercase English letters.