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 21:37	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 21:37	0	8,715,932	1,113,000	0	20,480	No answer to stdout. Died or killed?
2	Dec 20, 2025 21:47	34,324	40,173,469	18,913,000	995,000	2,531,328
3	Dec 20, 2025 22:06	34,383	44,326,189	18,945,000	997,000	2,269,184
4	Dec 20, 2025 21:46	34,693	42,925,414	19,116,000	1,006,000	2,269,184
5	Dec 20, 2025 21:46	34,798	41,277,486	19,174,000	1,009,000	2,531,328
6	Dec 20, 2025 21:54	34,843	45,502,897	19,199,000	1,010,000	2,269,184
7	Dec 20, 2025 21:46	34,995	42,581,586	19,283,000	1,014,000	2,285,568
8	Dec 20, 2025 21:53	35,226	40,628,188	19,410,000	1,021,000	2,281,472
9	Dec 20, 2025 21:47	35,226	39,822,789	20,431,000	0	2,531,328
10	Dec 20, 2025 21:46	35,297	48,055,516	20,472,000	0	2,523,136
11	Dec 20, 2025 21:54	35,440	46,540,847	20,555,000	0	2,289,664
12	Dec 20, 2025 21:47	35,448	41,442,689	20,560,000	0	2,285,568
13	Dec 20, 2025 21:47	35,566	39,481,801	19,597,000	1,031,000	2,269,184
14	Dec 20, 2025 21:53	35,798	47,918,539	19,775,000	988,000	2,531,328
15	Dec 20, 2025 21:53	36,062	45,635,634	19,920,000	996,000	2,273,280
16	Dec 20, 2025 21:54	36,217	40,526,586	20,006,000	1,000,000	2,531,328
17	Dec 20, 2025 21:53	36,260	42,276,629	19,028,000	2,003,000	2,531,328
18	Dec 20, 2025 21:53	36,360	49,202,458	20,085,000	1,004,000	2,523,136
19	Dec 20, 2025 21:54	36,371	42,351,298	19,086,000	2,009,000	2,527,232
20	Dec 20, 2025 21:54	36,383	45,118,163	20,098,000	1,004,000	2,535,424
21	Dec 20, 2025 21:53	36,533	42,461,044	19,171,000	2,018,000	2,523,136
22	Dec 20, 2025 21:47	36,548	41,618,021	20,189,000	1,009,000	2,281,472
23	Dec 20, 2025 22:06	36,852	47,484,550	20,357,000	1,017,000	2,523,136
24	Dec 20, 2025 21:54	36,859	47,810,371	21,378,000	0	2,531,328
25	Dec 20, 2025 21:49	36,867	39,542,260	20,365,000	1,018,000	2,527,232
26	Dec 20, 2025 21:46	36,978	43,282,859	21,447,000	0	2,269,184
27	Dec 20, 2025 21:53	36,981	46,490,237	20,428,000	1,021,000	2,523,136
28	Dec 20, 2025 21:53	36,990	47,721,804	21,454,000	0	2,269,184
29	Dec 20, 2025 21:49	37,010	45,443,290	20,444,000	1,022,000	2,281,472
30	Dec 20, 2025 21:47	37,238	42,385,111	21,598,000	0	2,367,488
31	Dec 20, 2025 21:46	37,469	47,934,164	21,732,000	0	2,535,424
32	Dec 20, 2025 21:46	37,519	46,719,661	21,761,000	0	2,527,232
33	Dec 20, 2025 21:53	37,753	44,070,779	20,902,000	995,000	2,375,680
34	Dec 20, 2025 21:47	37,767	46,502,587	20,910,000	995,000	2,527,232
35	Dec 20, 2025 21:53	37,897	46,473,140	20,981,000	999,000	2,535,424
36	Dec 20, 2025 21:49	37,903	48,450,207	19,986,000	1,998,000	2,523,136
37	Dec 20, 2025 21:47	37,950	43,146,970	21,011,000	1,000,000	2,265,088
38	Dec 20, 2025 21:54	37,957	43,485,483	20,014,000	2,001,000	2,527,232
39	Dec 20, 2025 21:54	38,041	44,777,647	20,059,000	2,005,000	2,527,232
40	Dec 20, 2025 21:53	38,153	42,057,746	20,118,000	2,011,000	2,523,136
41	Dec 20, 2025 21:53	38,228	46,331,193	20,157,000	2,015,000	2,277,376
42	Dec 20, 2025 21:53	38,391	46,319,757	21,255,000	1,012,000	2,269,184
43	Dec 20, 2025 21:46	38,419	43,303,319	20,258,000	2,025,000	2,519,040
44	Dec 20, 2025 21:46	38,667	42,610,786	22,427,000	0	2,531,328
45	Dec 20, 2025 21:53	38,774	43,778,427	21,467,000	1,022,000	2,527,232
46	Dec 20, 2025 21:53	38,784	43,855,562	21,473,000	1,022,000	2,355,200
47	Dec 20, 2025 21:47	39,071	52,488,023	21,631,000	1,030,000	2,519,040
48	Dec 20, 2025 22:06	39,176	47,028,668	21,690,000	1,032,000	2,535,424
49	Dec 20, 2025 21:54	39,486	45,589,236	20,911,000	1,991,000	2,519,040

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