MetaCoding·20 minMembers
Minimum Add to Make Parentheses Valid
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LC 921 — count the minimum insertions (of `(` or `)`) needed to make a parens string valid. Surfaced as the first E5 phone-screen problem.
SWE
string
stack
greedy
easy
Frequency
Single report
Last asked
2026-04-23
Stage
phone-screen
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