Status: IN
Solutions achieve correctness through three construction techniques — exact arithmetic prevents precision errors, sentinel initialization eliminates boundary-condition branches, and LeetCode's input contract removes invalid-input scenarios — rather than through any form of runtime defensive checking.
Three independent construction mechanisms collectively eliminate the need for runtime validation
Depends on (SL): exactness-over-performance-at-every-layer, sentinel-values-bootstrap-streaming-state, leetcode-judge-optimized-not-reusable