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Quick Summary
Parse assignment statements where variables can reference other variables or direct integers.
Resolve dependency chains recursively until all references point to concrete numeric values.
Compute and return the final string representation of the target variable.
What This Tests
Dependency resolution and transitive closure
Recursive traversal with memoization
String parsing and mapping data structures
Graph reachability without cycles
Common Patterns
DFS/BFS
Hashing
Graph Traversal
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