GPU Credits Manager
GPU Credits Manager You're building a GPU credit ledger. Events can arrive out of order. RULES: 1) Grants are valid in [grant_timestamp, expiration_timestamp) 2) subtract() allocates from soonest-expiring grants first (FEFO) - tie-breaker: lexicographically smaller grant_id 3) Overdraw: partial take, no error, no negative balance 4) Timestamps are NOT monotonic 5) Same timestamp: a grant at time T is available for a subtract at time T 6) Duplicate grant_id: ignore the second create_grant (first wins)
Build a GPU credit ledger where events arrive out-of-order. Grants expire, subtracts allocate FEFO (soonest-expiring-first), and queries ask for balance at any timestamp. Part 2 adds retroactive cancellations, forcing full replay correctness.
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