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 listDec 20, 2024 18:35

Yuriy Lyfenko

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Dec 20, 2024 18:41	0	0	0	0	0	Error: expected "1026784 ", got "1030206 "
2	Dec 20, 2024 18:41	0	0	0	0	0	Error: expected "874899 ", got "911602 "
3	Dec 20, 2024 18:40	0	0	0	0	0	Error: expected "1029395 ", got "1051016 "
4	Dec 20, 2024 18:37	0	0	0	0	0	Error: expected "1942778 ", got "1942921 "
5	Dec 20, 2024 18:36	0	0	0	0	0	Error: expected "1324211 ", got "1327512 "
6	Dec 20, 2024 18:36	0	0	0	0	0	Error: expected "2152029 ", got "2153331 "
7	Dec 20, 2024 18:35	0	0	0	0	0	Error: expected "1079087 ", got "1109488 "
8	Dec 20, 2024 18:35	0	0	0	0	0	Error: expected "1381696 ", got "1389467 "
9	Dec 20, 2024 18:49	32,574	49,070,823	16,905,000	1,988,000	2,285,568
10	Dec 20, 2024 18:35	32,588	51,224,150	17,907,000	994,000	2,260,992
11	Dec 20, 2024 18:35	32,600	43,574,945	17,913,000	995,000	2,285,568
12	Dec 20, 2024 18:41	32,634	47,156,917	16,936,000	1,992,000	2,285,568
13	Dec 20, 2024 18:35	32,748	37,813,192	16,995,000	1,999,000	2,277,376
14	Dec 20, 2024 18:41	32,814	44,318,468	17,029,000	2,003,000	2,285,568
15	Dec 20, 2024 18:41	32,847	44,323,545	17,046,000	2,005,000	2,281,472
16	Dec 20, 2024 18:41	32,871	39,299,811	18,062,000	1,003,000	2,277,376
17	Dec 20, 2024 18:40	32,909	46,112,764	17,078,000	2,009,000	2,277,376
18	Dec 20, 2024 18:49	32,922	44,385,521	17,085,000	2,010,000	2,285,568
19	Dec 20, 2024 18:35	32,991	43,082,186	17,121,000	2,014,000	2,396,160
20	Dec 20, 2024 18:41	33,007	41,013,873	18,137,000	1,007,000	2,277,376
21	Dec 20, 2024 18:35	33,024	41,016,870	17,138,000	2,016,000	2,285,568
22	Dec 20, 2024 18:41	33,036	48,284,966	18,153,000	1,008,000	2,285,568
23	Dec 20, 2024 18:35	33,041	38,224,346	17,147,000	2,017,000	2,277,376
24	Dec 20, 2024 18:40	33,081	35,910,675	17,168,000	2,019,000	2,285,568
25	Dec 20, 2024 18:48	33,226	40,325,880	17,243,000	2,028,000	2,285,568
26	Dec 20, 2024 18:49	33,250	40,479,011	17,255,000	2,030,000	2,285,568
27	Dec 20, 2024 18:35	33,310	40,704,755	17,287,000	2,033,000	2,277,376
28	Dec 20, 2024 18:35	33,422	36,870,308	17,345,000	2,040,000	2,285,568
29	Dec 20, 2024 18:41	33,469	43,116,465	18,391,000	1,021,000	2,273,280
30	Dec 20, 2024 18:48	33,557	43,351,177	18,439,000	1,024,000	2,269,184
31	Dec 20, 2024 18:41	33,557	46,283,482	18,439,000	1,024,000	2,285,568
32	Dec 20, 2024 18:40	33,578	43,378,336	18,450,000	1,025,000	2,281,472
33	Dec 20, 2024 18:48	33,583	44,047,889	19,478,000	0	2,277,376
34	Dec 20, 2024 18:35	33,671	41,589,640	18,502,000	1,027,000	2,285,568
35	Dec 20, 2024 18:41	36,210	38,921,263	19,002,000	2,000,000	2,285,568

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