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Quick Summary
Process a sequential list of buy and sell trades to update a starting cash balance and stock holdings.
Track individual stock quantities efficiently while adjusting the cash balance for each transaction.
Format the final state as a list of symbol-quantity pairs, including remaining cash, sorted alphabetically.
What This Tests
Dictionary-based state tracking for dynamic collections
Sequential iteration and arithmetic updates
Data type conversion and string formatting
Alphabetical sorting of collection keys
Common Patterns
Hashing
Sorting
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