LC 83
Remove Duplicates from Sorted List
Easy · LC 1–100
Candidate solution routes
Primary
FreeLinked-List Pointer Rewiring
Invariant: prev bounds the correctly processed chain and cur is the first unprocessed node; every original node belongs to exactly one side and remains reachable.
candidate confidence: 0.588 · metadata_only
Alternate 1
FreeSame-Direction / Read-Write Pointers
Invariant: After processing a[0:read], a[0:write] is exactly its correct stable filtered output, with write no farther than read+1.
candidate confidence: 0.470 · 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.