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Implement a simplified spreadsheet class that stores cell values and evaluates simple two-term formulas.
Formulas reference other cells or numeric literals and are evaluated dynamically on each getCell call.
Results must be computed fresh per call without persisting intermediate states across invocations.
What This Tests
Dependency resolution using graph traversal
Hash map based storage and lookup
Recursive evaluation with per-call memoization
String parsing and tokenization
Common Patterns
Graph Traversal
DFS/BFS
Hashing
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