Order book

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

Feel free to create an issue if you need an extra library from the standard Ubuntu repository.

Name	Version	Description
libc6-dev	2.39-0ubuntu8.7	GNU C Library: Development Libraries and Header Files Contains the symlinks, headers, and object files needed to compile and link programs which use the standard C library.
libclang-common-14-dev	1:14.0.6-19build4	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-15-dev	1:15.0.7-14build3	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-16-dev	1:16.0.6-23ubuntu4	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-17-dev	1:17.0.6-9ubuntu1	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-18-dev	1:18.1.3-1ubuntu1	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-19-dev	1:19.1.1-1ubuntu1~24.04.2	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-20-dev	1:20.1.2-0ubuntu1~24.04.2	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libcrypt-dev	1:4.4.36-4build1	libcrypt development files This package contains the files needed for developing applications that use libcrypt.
libgcc-10-dev	10.5.0-4ubuntu2.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-11-dev	11.5.0-1ubuntu1~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-12-dev	12.4.0-2ubuntu1~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-13-dev	13.3.0-6ubuntu2~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-14-dev	14.2.0-4ubuntu2~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libobjc-13-dev	13.3.0-6ubuntu2~24.04.1	Runtime library for GNU Objective-C applications (development files) This package contains the headers and static library files needed to build GNU ObjC applications.
libssl-dev	3.0.13-0ubuntu3.9	Secure Sockets Layer toolkit - development files This package is part of the OpenSSL project's implementation of the SSL and TLS cryptographic protocols for secure communication over the Internet. . It contains development libraries, header files, and manpages for libssl and libcrypto.
libstdc++-10-dev	10.5.0-4ubuntu2.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-11-dev	11.5.0-1ubuntu1~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-12-dev	12.4.0-2ubuntu1~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-13-dev	13.3.0-6ubuntu2~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-14-dev	14.2.0-4ubuntu2~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libtbb-dev	2021.11.0-2ubuntu2	parallelism library for C++ - development files TBB is a library that helps you leverage multi-core processor performance without having to be a threading expert. It represents a higher-level, task-based parallelism that abstracts platform details and threading mechanism for performance and scalability. . (Note: if you are a user of the i386 architecture, i.e., 32-bit Intel or compatible hardware, this package only supports Pentium4-compatible and higher processors.) . This package includes the TBB development files.

Back to listApr 17, 2024 19:20

E Sequeira

Score: 77,391

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Apr 17, 2024 19:20	75,816	66,855,054	41,975,000	1,998,000	2,510,848
2	Apr 17, 2024 19:20	75,862	73,186,351	42,000,000	2,000,000	2,265,088
3	Apr 17, 2024 19:56	75,964	70,067,736	42,057,000	2,002,000	2,285,568
4	Apr 17, 2024 19:56	76,028	75,370,317	43,094,000	1,002,000	2,510,848
5	Apr 17, 2024 19:33	76,053	68,255,289	42,106,000	2,005,000	2,510,848
6	Apr 17, 2024 19:33	76,066	71,186,803	42,113,000	2,005,000	2,351,104
7	Apr 17, 2024 19:20	76,274	66,468,429	42,229,000	2,010,000	2,269,184
8	Apr 17, 2024 19:56	76,431	73,684,744	42,315,000	2,015,000	2,269,184
9	Apr 17, 2024 19:20	76,443	73,356,642	43,330,000	1,007,000	2,285,568
10	Apr 17, 2024 19:56	76,488	71,829,666	43,355,000	1,008,000	2,285,568
11	Apr 17, 2024 19:56	76,529	72,177,376	43,379,000	1,008,000	2,260,992
12	Apr 17, 2024 19:20	76,559	67,249,391	43,395,000	1,009,000	2,363,392
13	Apr 17, 2024 19:20	76,617	72,213,422	43,429,000	1,009,000	2,285,568
14	Apr 17, 2024 19:33	76,686	66,429,653	43,468,000	1,010,000	2,510,848
15	Apr 17, 2024 19:33	76,940	75,385,823	43,611,000	1,014,000	2,285,568
16	Apr 17, 2024 19:33	77,110	70,658,392	43,708,000	1,016,000	2,285,568
17	Apr 17, 2024 19:33	77,372	76,267,978	43,879,000	997,000	2,285,568
18	Apr 17, 2024 19:20	77,383	73,949,250	43,885,000	997,000	2,285,568
19	Apr 17, 2024 19:56	77,391	72,729,848	43,890,000	997,000	2,359,296
20	Apr 17, 2024 19:56	77,400	72,782,270	43,895,000	997,000	2,510,848
21	Apr 17, 2024 19:33	77,402	72,191,469	42,898,000	1,995,000	2,510,848
22	Apr 17, 2024 19:20	77,472	65,231,680	42,937,000	1,997,000	2,519,040
23	Apr 17, 2024 19:56	77,710	67,361,920	43,069,000	2,003,000	2,285,568
24	Apr 17, 2024 19:56	77,753	68,267,042	43,093,000	2,004,000	2,260,992
25	Apr 17, 2024 19:33	77,762	68,459,301	44,100,000	1,002,000	2,519,040
26	Apr 17, 2024 19:20	77,812	66,908,021	43,126,000	2,005,000	2,285,568
27	Apr 17, 2024 19:33	78,029	71,578,293	44,252,000	1,005,000	2,260,992
28	Apr 17, 2024 19:33	79,759	119,618,382	46,260,503	0	2,232,320
29	Apr 17, 2024 19:20	79,762	113,432,904	46,262,172	0	2,220,032
30	Apr 17, 2024 19:56	79,896	109,874,619	46,339,870	0	2,224,128
31	Apr 17, 2024 19:33	80,551	115,813,318	46,719,295	0	2,228,224
32	Apr 17, 2024 19:33	80,666	123,503,468	46,786,461	0	2,256,896
33	Apr 17, 2024 19:20	80,753	100,743,998	46,836,840	0	2,228,224
34	Apr 17, 2024 19:56	80,887	107,700,486	46,914,466	0	2,232,320
35	Apr 17, 2024 19:56	81,057	104,346,588	47,012,840	0	2,232,320
36	Apr 17, 2024 19:20	81,402	111,713,920	47,212,958	0	2,244,608

Model	Intel(R) Xeon(R) CPU E3-1271 v3 @ 3.60GHz
Cores	1