LeetCode
Experience
#921 Minimum Add to Make Parentheses Valid
Interview Experience
LeetCode #921: Minimum Add to Make Parentheses Valid. Difficulty: Medium. Topics: String, Stack, Greedy. Asked at Google in the last 6 months.
Original Source
This is a frequency-tagged signal. The full problem statement lives on the original source.
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Stack
Greedy
Stack
Strings