LC 6
Zigzag Conversion
Medium · LC 1–100
Candidate solution routes
Primary
FreeParsing / token state machine
Invariant: Before each loop, s[:i] has been completely and non-overlappingly tokenized; the next rule consumes at least one character or reports an error.
candidate confidence: 0.236 · metadata_only
How to use this page
Read the statement and constraints first, then validate recognition signals, invariant, and complexity. Candidate score is not correctness evidence.