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In-Place Mutation
Algorithms whose central requirement or advantage is transforming an input structure in place while preserving required data, ordering, reachability, or region invariants.
Browse articlesDuplicate Control
Reasoning that prevents, removes, detects, or safely tolerates repeated values or repeated candidate results as a central correctness obligation.
Browse articlesConstraint Tracking
Maintain compact state representing multiple simultaneous rules that candidate values, placements, or paths must satisfy.
Browse articlesDigit-by-Digit Arithmetic
Perform arithmetic or numeric transformation directly over a digit representation, maintaining position-wise state such as carry, borrow, partial products, or reconstructed digits.
Browse articlesParser State
Translate a textual grammar or staged input contract into explicit phases, flags, or state transitions that determine which characters or tokens are legal next.
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