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.

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Challenge History

Date	Challenger	Cost	Type	Status
Jul 5, 2026 20:55	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 20:56	0	2,753,579,481	2,745,662,000	0	16,384	No answer to stdout. Died or killed?
2	Dec 21, 2025 23:53	29,952	40,349,228	17,372,000	0	2,510,848
3	Dec 21, 2025 23:54	30,090	46,281,750	16,426,000	1,026,000	2,523,136
4	Dec 21, 2025 23:53	30,178	36,138,890	16,474,000	1,029,000	2,310,144
5	Dec 21, 2025 23:52	30,521	35,557,260	17,702,000	0	2,519,040
6	Dec 21, 2025 23:53	30,562	32,628,192	17,726,000	0	2,334,720
7	Dec 21, 2025 23:50	30,619	40,010,446	17,759,000	0	2,330,624
8	Dec 21, 2025 23:52	30,857	33,184,368	16,903,000	994,000	2,510,848
9	Dec 21, 2025 23:54	30,881	42,125,290	16,916,000	995,000	2,330,624
10	Dec 21, 2025 23:54	30,898	44,186,801	16,926,000	995,000	2,301,952
11	Dec 21, 2025 23:53	30,941	42,473,693	15,952,000	1,994,000	2,490,368
12	Dec 21, 2025 23:51	30,957	43,893,926	15,960,000	1,995,000	2,334,720
13	Dec 21, 2025 23:50	31,007	33,659,965	16,985,000	999,000	2,310,144
14	Dec 21, 2025 23:53	31,028	45,606,122	16,997,000	999,000	2,502,656
15	Dec 21, 2025 23:52	31,038	41,707,483	17,002,000	1,000,000	2,326,528
16	Dec 21, 2025 23:54	31,074	37,617,102	16,021,000	2,002,000	2,482,176
17	Dec 21, 2025 23:50	31,074	38,741,385	17,022,000	1,001,000	2,461,696
18	Dec 21, 2025 23:53	31,083	42,447,511	17,027,000	1,001,000	2,486,272
19	Dec 21, 2025 23:50	31,093	37,077,728	16,031,000	2,003,000	2,457,600
20	Dec 21, 2025 23:53	31,098	39,664,143	17,035,000	1,002,000	2,310,144
21	Dec 21, 2025 23:54	31,226	42,568,915	17,105,000	1,006,000	2,535,424
22	Dec 21, 2025 23:52	31,286	37,815,504	16,130,000	2,016,000	2,441,216
23	Dec 21, 2025 23:50	31,302	43,238,204	17,147,000	1,008,000	2,482,176
24	Dec 21, 2025 23:54	31,348	40,158,116	17,172,000	1,010,000	2,465,792
25	Dec 21, 2025 23:52	31,397	50,410,588	17,199,000	1,011,000	2,486,272
26	Dec 21, 2025 23:53	31,567	45,979,996	18,309,000	0	2,453,504
27	Dec 21, 2025 23:52	31,634	42,001,485	18,348,000	0	2,306,048
28	Dec 21, 2025 23:51	31,672	33,593,667	18,370,000	0	2,478,080
29	Dec 21, 2025 23:54	31,728	37,048,774	18,402,000	0	2,310,144
30	Dec 21, 2025 23:54	31,731	44,464,716	17,382,000	1,022,000	2,293,760
31	Dec 21, 2025 23:53	31,862	38,481,234	18,480,000	0	2,527,232
32	Dec 21, 2025 23:54	31,867	39,330,814	17,457,000	1,026,000	2,445,312
33	Dec 21, 2025 23:54	31,907	36,432,930	17,478,000	1,028,000	2,453,504
34	Dec 21, 2025 23:50	32,134	40,277,857	18,638,000	0	2,437,120
35	Dec 21, 2025 23:51	32,193	35,996,259	17,635,000	1,037,000	2,461,696
36	Dec 21, 2025 23:53	32,619	44,894,066	17,924,000	995,000	2,416,640
37	Dec 21, 2025 23:54	32,688	39,636,429	16,964,000	1,995,000	2,506,752
38	Dec 21, 2025 23:54	32,760	44,770,330	17,001,000	2,000,000	2,502,656
39	Dec 21, 2025 23:53	32,845	36,216,983	17,045,000	2,005,000	2,473,984
40	Dec 21, 2025 23:53	32,964	42,835,215	18,113,000	1,006,000	2,473,984

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