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 2, 2025 14:51

Yuriy Lyfenko

Error

Source Code

Source code access is restricted. Log in to request access.

Challenge History

No challenges yet.

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Apr 2, 2025 14:51	0	0	0	0	0	Testing system error
2	Apr 2, 2025 14:50	0	0	0	0	0	Testing system error
3	Apr 2, 2025 14:54	42,598	47,445,695	24,707,000	0	2,527,232
4	Apr 2, 2025 14:52	43,536	52,471,856	24,241,000	1,010,000	2,437,120
5	Apr 2, 2025 14:54	43,634	48,800,622	24,296,000	1,012,000	2,490,368
6	Apr 2, 2025 14:52	44,181	50,579,789	24,600,000	1,025,000	2,506,752
7	Apr 2, 2025 14:54	44,310	51,828,350	24,672,000	1,028,000	2,342,912
8	Apr 2, 2025 14:54	44,310	50,155,594	24,672,000	1,028,000	2,523,136
9	Apr 2, 2025 14:54	44,693	50,180,095	24,925,000	997,000	2,478,080
10	Apr 2, 2025 14:52	44,928	48,241,289	25,056,000	1,002,000	2,498,560
11	Apr 2, 2025 14:54	44,941	50,742,104	24,061,000	2,005,000	2,506,752
12	Apr 2, 2025 14:54	45,083	51,263,807	24,137,000	2,011,000	2,510,848
13	Apr 2, 2025 14:54	45,209	50,120,215	24,204,000	2,017,000	2,330,624
14	Apr 2, 2025 14:54	45,429	48,754,268	26,349,000	0	2,506,752
15	Apr 2, 2025 14:52	45,462	48,429,021	25,354,000	1,014,000	2,314,240
16	Apr 2, 2025 14:52	45,876	52,656,285	26,608,000	0	2,478,080
17	Apr 2, 2025 14:52	45,890	53,828,419	25,593,000	1,023,000	2,502,656
18	Apr 2, 2025 14:52	46,403	48,455,078	24,921,000	1,993,000	2,502,656
19	Apr 2, 2025 14:52	46,403	47,839,868	24,921,000	1,993,000	2,293,760
20	Apr 2, 2025 14:54	46,895	51,174,957	26,192,000	1,007,000	2,322,432
21	Apr 2, 2025 14:52	47,428	49,503,016	26,490,000	1,018,000	2,293,760
22	Apr 2, 2025 14:54	47,705	54,925,885	26,645,000	1,024,000	2,289,664
23	Apr 2, 2025 14:52	48,205	53,926,108	25,962,000	1,997,000	2,445,312
24	Apr 2, 2025 14:54	48,643	57,020,875	27,206,000	1,007,000	2,461,696
25	Apr 2, 2025 14:52	49,295	51,649,015	27,570,000	1,021,000	2,437,120
26	Apr 2, 2025 14:52	49,422	54,128,367	28,665,000	0	2,449,408
27	Apr 2, 2025 14:54	49,545	61,067,686	28,736,000	0	2,265,088
28	Apr 2, 2025 14:54	49,636	55,451,332	27,797,000	992,000	2,461,696
29	Apr 2, 2025 14:52	51,029	53,170,935	28,577,000	1,020,000	2,412,544
30	Apr 2, 2025 14:54	51,545	58,589,135	28,900,000	996,000	2,457,600
31	Apr 2, 2025 14:52	51,755	50,334,147	28,017,000	2,001,000	2,379,776
32	Apr 2, 2025 14:52	55,097	58,428,699	30,958,000	998,000	2,490,368
33	Apr 2, 2025 14:51	96,348	92,522,685	53,887,000	1,995,000	2,322,432
34	Apr 2, 2025 14:51	97,619	81,850,418	55,608,000	1,011,000	2,441,216
35	Apr 2, 2025 14:51	98,510	80,948,600	56,134,000	1,002,000	2,269,184

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