How should I practice Inventory Revenue Across Supply, Sell, and Return Logs?

Start by reading the full statement, solve the visible examples, then compare the pattern against related ZipRecruiter online assessment problems in FastPrep.

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Inventory Revenue Across Supply, Sell, and Return Logs

ZipRecruiter● HardFULLTIMENEW GRADOA

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Problem statement

Process string operations:

[supply,item,count,price] adds units at a unit price.
[sell,item,count] sells a guaranteed available quantity, consuming cheapest units first, and emits the consumed price total.
[return,item,count,originalSalePrice,newPrice] restores returned units at newPrice; originalSalePrice identifies the prior sale lot and emits no output.

Return sell revenues in order.

Function

inventoryRevenue(operations: String[][]) → long[]

Examples

Example 1

operations = [["supply","apple","2","5"],["supply","apple","1","3"],["sell","apple","2"],["return","apple","1","5","4"],["sell","apple","2"]]return = [8,9]

The first sale consumes prices 3 and 5; the second consumes 4 and 5.

Example 2

operations = [["supply","x","1","7"],["sell","x","1"]]return = [7]

The one supplied unit is sold.

Constraints

1 <= operations.length <= 100000
Counts and prices are positive integers.