[FullStack] Problem 1 - 6 Riki Rifaldi - rkrfld@gmail.com - #300
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Add sum_to_n.js with three implementations: iterative loop (O(n)), Gauss formula (O(1)), and recursion (O(n) time/space). All verified to agree on n = 0, 1, 5, 100.
Fetches live prices from interview.switcheo.com, dedupes by latest date, renders searchable token dropdowns with Switcheo icons (fallback on 404), computes live swap output, validates same-token/invalid-amount, mocks submit with a loading delay.
List 11 issues (undefined var, inverted filter, missing blockchain type, bad sort comparator, wasted useMemo deps, dead formattedBalances, index-as-key, dropped children) with a refactored WalletPage.tsx fixing each.
Same three approaches as problem1 (loop, Gauss formula, recursion), typed, each annotated with time/space complexity. Verified against n = 0, 1, 5, 100.
Resource CRUD (create/list/get/update/delete) with category/search/price filters, validated input, lowdb JSON-file persistence (no native deps). README covers config and run steps. Verified live: full CRUD flow, filters, 400/404 paths, disk persistence.
Data model (append-only score_events ledger + action_grants for one-time redeemable awards), API, execution-flow diagram, real-time delivery via pub/sub + selective top-10 cache invalidation, and anti-abuse design where the client never states its own point value.
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Summary
Test plan