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.

Restrictions:30s256Mb 1 Score Packages
Back to listFeb 6, 2024 05:38Tejas G.Tejas G.Error
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Run Statistics
#DateScoreWall TimeCPU UserCPU SystemMemoryError
1Feb 6, 2024 05:3800000Error: expected "2066724 ", got "Adding 2780 38 Adding 1015 141 Adding 1370 139 Adding 1138 143 Adding 1912 104 Adding 2295 135 Adding 1635 169 Adding 1985 187 Adding 2255 59 Adding 1000 39 Adding 1004 164 Adding 1024 33 Adding 2484 110 Adding 2499 114...