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 21:10	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 21:10	0	8,674,572	868,000	0	20,480	No answer to stdout. Died or killed?
2	Dec 21, 2025 02:03	31,931	49,920,815	17,492,000	1,028,000	2,408,448
3	Dec 21, 2025 02:04	31,941	42,323,399	17,497,000	1,029,000	2,523,136
4	Dec 21, 2025 02:03	31,960	40,381,013	17,508,000	1,029,000	2,531,328
5	Dec 21, 2025 02:16	31,981	38,049,727	18,549,000	0	2,416,640
6	Dec 21, 2025 02:02	32,014	39,533,466	18,568,000	0	2,408,448
7	Dec 21, 2025 02:14	32,105	39,754,333	17,587,000	1,034,000	2,420,736
8	Dec 21, 2025 02:03	32,164	47,219,209	18,655,000	0	2,412,544
9	Dec 21, 2025 02:03	32,167	39,016,310	18,657,000	0	2,412,544
10	Dec 21, 2025 02:03	32,271	45,012,199	17,678,000	1,039,000	2,408,448
11	Dec 21, 2025 02:04	32,619	41,779,146	16,928,000	1,991,000	2,523,136
12	Dec 21, 2025 02:15	32,622	42,942,908	15,934,000	2,987,000	2,404,352
13	Dec 21, 2025 02:16	32,640	45,526,566	17,880,000	1,051,000	2,412,544
14	Dec 21, 2025 02:03	32,784	40,173,043	17,014,000	2,001,000	2,412,544
15	Dec 21, 2025 02:15	32,850	39,934,827	17,048,000	2,005,000	2,408,448
16	Dec 21, 2025 02:15	32,850	40,565,109	17,048,000	2,005,000	2,408,448
17	Dec 21, 2025 02:14	32,864	43,323,191	17,055,000	2,006,000	2,424,832
18	Dec 21, 2025 02:02	32,869	44,284,856	17,058,000	2,006,000	2,375,680
19	Dec 21, 2025 02:16	33,097	40,089,097	18,186,000	1,010,000	2,420,736
20	Dec 21, 2025 02:16	33,124	45,179,763	17,190,000	2,022,000	2,408,448
21	Dec 21, 2025 02:14	33,238	41,783,120	18,264,000	1,014,000	2,531,328
22	Dec 21, 2025 02:02	33,316	37,979,848	19,323,000	0	2,416,640
23	Dec 21, 2025 02:14	33,324	43,730,615	18,311,000	1,017,000	2,408,448
24	Dec 21, 2025 02:16	33,429	42,248,932	19,389,000	0	2,404,352
25	Dec 21, 2025 02:02	33,655	43,111,102	18,493,000	1,027,000	2,404,352
26	Dec 21, 2025 02:15	33,716	43,658,933	18,526,000	1,029,000	2,269,184
27	Dec 21, 2025 02:03	33,729	41,786,004	18,534,000	1,029,000	2,531,328
28	Dec 21, 2025 02:04	33,752	44,647,438	19,576,000	0	2,416,640
29	Dec 21, 2025 02:14	33,788	39,252,975	19,597,000	0	2,523,136
30	Dec 21, 2025 02:14	33,819	38,845,325	18,583,000	1,032,000	2,531,328
31	Dec 21, 2025 02:15	33,931	45,288,361	19,680,000	0	2,420,736
32	Dec 21, 2025 02:16	33,952	40,875,674	18,656,000	1,036,000	2,404,352
33	Dec 21, 2025 02:14	34,048	43,041,302	18,709,000	1,039,000	2,416,640
34	Dec 21, 2025 02:16	34,091	48,764,980	18,733,000	1,040,000	2,269,184
35	Dec 21, 2025 02:04	34,317	46,737,382	18,909,000	995,000	2,531,328
36	Dec 21, 2025 02:16	34,345	43,009,669	18,924,000	996,000	2,531,328
37	Dec 21, 2025 02:05	34,352	49,436,399	17,932,000	1,992,000	2,420,736
38	Dec 21, 2025 02:15	34,386	41,020,253	17,950,000	1,994,000	2,437,120
39	Dec 21, 2025 02:03	34,407	52,547,317	17,961,000	1,995,000	2,416,640
40	Dec 21, 2025 02:03	34,410	41,448,819	17,963,000	1,995,000	2,404,352
41	Dec 21, 2025 02:02	34,474	42,032,975	17,996,000	1,999,000	2,404,352
42	Dec 21, 2025 02:15	34,564	52,156,209	19,045,000	1,002,000	2,523,136
43	Dec 21, 2025 02:02	34,605	37,344,955	18,064,000	2,007,000	2,523,136
44	Dec 21, 2025 02:02	34,629	39,144,828	18,077,000	2,008,000	2,404,352
45	Dec 21, 2025 02:14	34,634	45,868,606	18,080,000	2,008,000	2,523,136
46	Dec 21, 2025 02:03	34,660	49,250,372	18,093,000	2,010,000	2,383,872
47	Dec 21, 2025 02:04	34,712	49,354,942	18,120,000	2,013,000	2,269,184
48	Dec 21, 2025 02:05	34,748	46,729,331	18,139,000	2,015,000	2,523,136
49	Dec 21, 2025 02:02	34,762	43,246,364	18,146,000	2,016,000	2,523,136
50	Dec 21, 2025 02:04	34,778	40,696,329	19,163,000	1,008,000	2,408,448
51	Dec 21, 2025 02:15	34,784	36,434,685	19,167,000	1,008,000	2,408,448
52	Dec 21, 2025 02:05	34,798	47,427,539	18,165,000	2,018,000	2,523,136
53	Dec 21, 2025 02:15	34,812	37,162,237	18,172,000	2,019,000	2,404,352
54	Dec 21, 2025 02:02	34,845	39,374,019	18,189,000	2,021,000	2,387,968
55	Dec 21, 2025 02:04	34,881	44,461,603	18,208,000	2,023,000	2,412,544
56	Dec 21, 2025 02:03	34,888	36,713,558	18,212,000	2,023,000	2,408,448
57	Dec 21, 2025 02:04	34,900	41,552,924	19,230,000	1,012,000	2,523,136
58	Dec 21, 2025 02:03	34,919	40,062,734	18,228,000	2,025,000	2,404,352
59	Dec 21, 2025 02:14	34,919	41,257,175	18,228,000	2,025,000	2,412,544
60	Dec 21, 2025 02:15	35,126	41,016,807	20,373,000	0	2,416,640
61	Dec 21, 2025 02:15	35,171	41,435,769	20,399,000	0	2,527,232
62	Dec 21, 2025 02:04	35,179	46,619,714	20,404,000	0	2,400,256
63	Dec 21, 2025 02:03	35,281	48,823,158	19,440,000	1,023,000	2,408,448
64	Dec 21, 2025 02:16	35,298	51,070,140	20,473,000	0	2,527,232
65	Dec 21, 2025 02:03	35,767	45,160,161	20,745,000	0	2,371,584
66	Dec 21, 2025 02:03	36,029	45,859,348	18,907,000	1,990,000	2,523,136
67	Dec 21, 2025 02:15	36,052	46,707,679	19,915,000	995,000	2,416,640

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