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	1:20.1.2-0ubuntu1~24.04.3	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	3.0.13-0ubuntu3.11	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 19, 2026 10:48

Dominique Garmier

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Challenge History

Date	Challenger	Cost	Type	Status
Sep 11, 2026 16:04	Andrew Epstein	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Sep 11, 2026 16:10	0	26,510,275	10,941,000	4,541,000	2,113,536	expected "858954622 ", got "0 "
2	Sep 11, 2026 16:10	0	25,753,913	10,977,000	4,184,000	2,113,536	expected "861897731 ", got "0 "
3	Sep 11, 2026 16:10	0	25,353,603	10,772,000	4,254,000	2,113,536	expected "874697490 ", got "0 "
4	Mar 20, 2026 08:10	18,253	28,162,733	9,529,000	1,058,000	2,289,664
5	Mar 20, 2026 08:10	18,314	26,224,300	9,560,000	1,062,000	2,519,040
6	Mar 20, 2026 07:49	18,317	31,654,987	10,624,000	0	2,289,664
7	Mar 20, 2026 07:49	18,321	30,318,053	10,626,000	0	2,289,664
8	Mar 19, 2026 03:28	18,369	31,066,125	9,589,000	1,065,000	2,506,752
9	Mar 21, 2026 02:03	18,381	29,243,784	10,661,000	0	2,285,568
10	Mar 21, 2026 02:51	18,383	31,413,845	9,596,000	1,066,000	2,289,664
11	Mar 21, 2026 01:05	18,383	32,102,116	9,596,000	1,066,000	2,289,664
12	Mar 21, 2026 02:51	18,397	26,993,863	9,603,000	1,067,000	2,289,664
13	Mar 21, 2026 02:58	18,410	27,547,649	9,611,000	1,067,000	2,289,664
14	Mar 21, 2026 01:05	18,410	27,835,256	9,611,000	1,067,000	2,289,664
15	Mar 21, 2026 02:58	18,416	28,423,098	9,613,000	1,068,000	2,506,752
16	Mar 20, 2026 08:10	18,421	27,208,184	9,616,000	1,068,000	2,289,664
17	Mar 19, 2026 03:28	18,429	33,619,203	10,689,000	0	2,510,848
18	Mar 15, 2026 21:31	18,433	26,512,408	9,622,000	1,069,000	2,289,664
19	Mar 19, 2026 03:28	18,434	26,205,425	10,692,000	0	2,506,752
20	Mar 21, 2026 01:05	18,466	29,295,599	9,639,000	1,071,000	2,289,664
21	Mar 20, 2026 02:28	18,479	29,915,626	10,718,000	0	2,510,848
22	Mar 21, 2026 02:58	18,483	26,090,352	10,720,000	0	2,289,664
23	Mar 22, 2026 22:41	18,495	27,626,285	10,727,000	0	2,514,944
24	Mar 15, 2026 21:31	18,536	27,988,806	9,676,000	1,075,000	2,285,568
25	Mar 20, 2026 02:28	18,543	27,975,857	10,755,000	0	2,285,568
26	Mar 19, 2026 10:51	18,572	28,199,642	9,695,000	1,077,000	2,514,944
27	Mar 19, 2026 10:51	18,609	24,580,302	9,714,000	1,079,000	2,285,568
28	Mar 20, 2026 02:28	18,650	32,174,695	9,736,000	1,081,000	2,289,664
29	Mar 20, 2026 07:49	18,669	28,083,717	9,746,000	1,082,000	2,289,664
30	Mar 21, 2026 02:51	18,728	24,398,167	8,887,000	1,975,000	2,510,848
31	Mar 21, 2026 02:03	18,791	29,260,291	9,909,000	990,000	2,289,664
32	Mar 20, 2026 00:36	18,795	26,773,399	8,919,000	1,982,000	2,289,664
33	Mar 21, 2026 02:03	18,809	26,751,527	9,918,000	991,000	2,510,848
34	Mar 20, 2026 00:36	18,809	31,213,568	9,918,000	991,000	2,289,664
35	Mar 22, 2026 22:41	18,809	28,319,242	8,926,000	1,983,000	2,293,760
36	Mar 15, 2026 21:31	18,816	27,851,422	9,921,000	992,000	2,285,568
37	Mar 19, 2026 10:51	18,821	27,357,543	9,924,000	992,000	2,502,656
38	Mar 22, 2026 22:41	18,826	32,108,186	9,927,000	992,000	2,289,664
39	Mar 20, 2026 00:36	18,848	32,466,811	8,945,000	1,987,000	2,510,848
40	Mar 19, 2026 10:48	18,866	25,019,931	9,948,000	994,000	2,506,752
41	Mar 19, 2026 10:48	18,928	27,557,245	9,980,000	998,000	2,506,752
42	Mar 19, 2026 10:48	19,009	28,454,369	9,021,000	2,004,000	2,506,752

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