Order book Yuriy Lyfenko

Simulate a sell-side order book and calculate the cost of a final purchase as fast as possible.

Input

1,000,000 order updates on STDIN, one per line:

  • + <price> <size> – add a new sell order
  • - <position> – delete the order at the given position
  • = <size> – buy <size> shares from the top of the order book

After all updates are processed, buy 1,000 shares from the top of the order book.

Output

Print the total cost of the final 1,000-share purchase to STDOUT.

Order Book Rules

Orders are sorted by price ascending (lower is better). Orders at the same price are sorted by arrival time (earlier first). Position 0 is the best (lowest-price) offer.

The = (buy) operation consumes shares starting from position 0. If an order is fully consumed, it is removed from the book.

Example

Input Order book state
+ 1137 100 (1137,100)
+ 1130 10 (1130,10), (1137,100)
+ 1130 50 (1130,10), (1130,50), (1137,100)
- 0 (1130,50), (1137,100)
+ 1150 200 (1130,50), (1137,100), (1150,200)
= 200 (1150,150)

Total cost of the last buy: 50 * 1130 + 100 * 1137 + 50 * 1150.

Back to listFeb 10, 2026 13:00Code HintsCode HintsScore: 79,745Success
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Run Statistics
#DateScoreWall TimeCPU UserCPU SystemMemoryError
1Feb 10, 2026 13:0079,27270,483,59543,979,0001,999,0002,473,984
2Feb 10, 2026 13:0079,39775,245,20144,048,0002,002,0002,510,848
3Feb 10, 2026 13:0079,56770,748,46144,143,0002,006,0002,453,504
4Feb 10, 2026 13:0079,57972,636,44544,150,0002,006,0002,351,104
5Feb 10, 2026 13:0079,74570,073,75945,247,0001,005,0002,502,656
6Feb 10, 2026 13:0080,23871,238,61145,527,0001,011,0002,494,464
7Feb 10, 2026 13:0080,28375,500,77145,552,0001,012,0002,347,008
8Feb 10, 2026 13:0080,42179,115,06546,644,00002,351,104
9Feb 10, 2026 13:0080,86472,246,66545,904,000997,0002,355,200