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 listMar 31, 2025 19:36

Yuriy Lyfenko

Score: 64,048

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 31, 2025 19:35	55,734	62,137,498	31,316,000	1,010,000	2,510,848
2	Mar 31, 2025 19:35	57,341	56,107,314	31,243,000	2,015,000	2,453,504
3	Mar 31, 2025 19:35	57,534	55,286,215	32,359,000	1,011,000	2,289,664
4	Mar 31, 2025 19:47	57,559	53,547,964	33,384,000	0	2,428,928
5	Mar 31, 2025 19:35	57,628	61,384,475	32,412,000	1,012,000	2,510,848
6	Mar 31, 2025 19:49	57,703	57,296,626	32,454,000	1,014,000	2,265,088
7	Mar 31, 2025 19:35	58,448	65,994,021	32,903,000	997,000	2,510,848
8	Mar 31, 2025 19:49	58,514	56,240,400	31,942,000	1,996,000	2,441,216
9	Mar 31, 2025 19:37	58,579	56,703,636	31,978,000	1,998,000	2,433,024
10	Mar 31, 2025 19:37	58,797	59,861,991	33,099,000	1,003,000	2,502,656
11	Mar 31, 2025 19:36	58,821	56,853,489	32,110,000	2,006,000	2,498,560
12	Mar 31, 2025 19:35	59,155	59,259,418	31,283,000	3,027,000	2,506,752
13	Mar 31, 2025 19:37	59,195	60,166,439	32,314,000	2,019,000	2,416,640
14	Mar 31, 2025 19:49	59,429	57,290,887	33,456,000	1,013,000	2,428,928
15	Mar 31, 2025 19:35	62,255	58,405,687	34,102,000	2,006,000	2,490,368
16	Mar 31, 2025 19:37	63,090	65,913,902	35,576,000	1,016,000	2,392,064
17	Mar 31, 2025 19:36	63,231	69,532,942	35,656,000	1,018,000	2,498,560
18	Mar 31, 2025 19:47	63,736	64,158,163	36,967,000	0	2,453,504
19	Mar 31, 2025 19:37	64,048	57,535,014	35,140,000	2,008,000	2,482,176
20	Mar 31, 2025 19:49	65,343	66,610,559	35,905,000	1,994,000	2,420,736
21	Mar 31, 2025 19:47	65,347	63,062,896	36,904,000	997,000	2,396,160
22	Mar 31, 2025 19:47	65,912	60,124,193	36,217,000	2,012,000	2,486,272
23	Mar 31, 2025 19:49	66,334	65,863,125	37,462,000	1,012,000	2,478,080
24	Mar 31, 2025 19:37	67,003	66,532,838	36,870,000	1,992,000	2,502,656
25	Mar 31, 2025 19:35	67,066	61,622,499	36,904,000	1,994,000	2,469,888
26	Mar 31, 2025 19:47	67,843	66,739,005	37,332,000	2,017,000	2,383,872
27	Mar 31, 2025 19:35	68,036	63,943,764	38,450,000	1,011,000	2,449,408
28	Mar 31, 2025 19:47	68,779	65,841,452	38,895,000	997,000	2,465,792
29	Mar 31, 2025 19:49	68,974	63,429,031	37,005,000	3,000,000	2,437,120
30	Mar 31, 2025 19:36	69,374	69,497,328	38,226,000	2,011,000	2,400,256
31	Mar 31, 2025 19:48	103,219	90,122,622	58,870,000	997,000	2,428,928
32	Mar 31, 2025 19:36	104,586	85,926,917	60,660,000	0	2,441,216
33	Mar 31, 2025 19:48	105,355	83,249,865	59,103,000	2,003,000	2,514,944
34	Mar 31, 2025 19:36	107,134	84,983,889	61,136,000	1,002,000	2,482,176
35	Mar 31, 2025 19:36	110,941	87,601,543	63,341,000	1,005,000	2,375,680
36	Mar 31, 2025 19:48	114,729	89,801,603	65,535,000	1,008,000	2,478,080

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