Status: IN
Solutions systematically choose exact representations — integer arithmetic over floating-point, string-based digit extraction over modular arithmetic, isqrt over sqrt — prioritizing correctness guarantees over micro-optimization at every computational layer.
Both patterns sacrifice theoretical efficiency (string ops are slower than arithmetic, isqrt has overhead) for the same reason: eliminating an entire class of precision bugs rather than reasoning about when they'd actually trigger
Depends on (SL): integer-arithmetic-avoids-float-precision, string-over-arithmetic-for-digit-ops