How should I practice P&L Leaderboard Operations?

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P&L Leaderboard Operations

Bloomberg LP● MediumNEW GRADONSITE INTERVIEW

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Problem statement

Process a finite sequence of operations on a trader score leaderboard. Each operation is a string array:

["ADD", traderId, scoreDelta] creates the trader with score 0 if needed, then adds the positive delta.
["TOP", k] emits the sum of the k highest current trader scores.
["RESET", traderId] sets that registered trader's score to 0.

Process operations in order and return one long result for every TOP operation, in encounter order.

Function

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

Examples

Example 1

operations = [["ADD","1","73"],["ADD","2","56"],["ADD","3","39"],["TOP","2"],["RESET","1"],["ADD","2","45"],["TOP","2"]]return = [129,140]

The first top-two sum is 73 + 56. After resetting trader 1 and increasing trader 2 to 101, the second sum is 101 + 39 = 140.

Example 2

operations = [["ADD","10","5"],["ADD","10","7"],["TOP","1"],["RESET","10"],["TOP","1"]]return = [12,0]

Repeated ADD operations accumulate. RESET keeps the trader registered with score zero.

Example 3

operations = [["ADD","4","8"],["ADD","2","8"],["ADD","9","3"],["TOP","3"]]return = [19]

The only query sums every registered score: 8 + 8 + 3 = 19.

Constraints

1 <= operations.length <= 100000.
traderId is a positive 32-bit integer written in decimal.
1 <= scoreDelta <= 1000000.
Every RESET refers to a registered trader.
Every TOP uses 1 <= k <= the number of registered traders.
At least one TOP operation is present.
Every emitted sum fits in a signed 64-bit integer.