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 20:42	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 20:42	0	2,765,679,123	2,757,672,000	0	16,384	No answer to stdout. Died or killed?
2	Dec 26, 2025 11:07	28,071	40,425,692	16,281,000	0	2,347,008
3	Dec 26, 2025 11:10	28,283	43,546,089	16,404,000	0	2,342,912
4	Dec 26, 2025 11:09	28,862	45,522,895	16,740,000	0	2,510,848
5	Dec 26, 2025 11:05	29,145	47,146,447	15,910,000	994,000	2,527,232
6	Dec 26, 2025 11:09	29,145	34,984,002	14,916,000	1,988,000	2,519,040
7	Dec 26, 2025 11:07	29,147	44,506,076	16,905,000	0	2,301,952
8	Dec 26, 2025 11:07	29,148	43,225,023	15,912,000	994,000	2,334,720
9	Dec 26, 2025 11:09	29,169	42,153,229	14,928,000	1,990,000	2,334,720
10	Dec 26, 2025 11:07	29,171	49,200,747	15,924,000	995,000	2,326,528
11	Dec 26, 2025 11:10	29,198	45,136,642	15,939,000	996,000	2,310,144
12	Dec 26, 2025 11:11	29,284	38,649,272	15,986,000	999,000	2,281,472
13	Dec 26, 2025 11:11	29,307	33,278,698	15,999,000	999,000	2,498,560
14	Dec 26, 2025 11:07	29,369	37,157,721	16,032,000	1,002,000	2,342,912
15	Dec 26, 2025 11:09	29,391	39,035,446	15,042,000	2,005,000	2,506,752
16	Dec 26, 2025 11:10	29,417	38,498,246	15,055,000	2,007,000	2,494,464
17	Dec 26, 2025 11:05	29,553	41,779,879	16,133,000	1,008,000	2,322,432
18	Dec 26, 2025 11:05	29,772	36,830,996	17,268,000	0	2,281,472
19	Dec 26, 2025 11:07	29,793	40,700,719	17,280,000	0	2,523,136
20	Dec 26, 2025 11:05	29,812	47,169,021	17,291,000	0	2,334,720
21	Dec 26, 2025 11:05	29,812	41,863,836	17,291,000	0	2,502,656
22	Dec 26, 2025 11:07	29,855	44,490,176	17,316,000	0	2,465,792
23	Dec 26, 2025 11:05	29,866	30,524,586	17,322,000	0	2,306,048
24	Dec 26, 2025 11:10	29,874	40,320,255	17,327,000	0	2,310,144
25	Dec 26, 2025 11:10	29,874	39,362,107	16,308,000	1,019,000	2,416,640
26	Dec 26, 2025 11:09	29,972	42,590,448	17,384,000	0	2,281,472
27	Dec 26, 2025 11:10	30,000	31,571,067	17,400,000	0	2,285,568
28	Dec 26, 2025 11:07	30,022	44,286,672	17,413,000	0	2,330,624
29	Dec 26, 2025 11:05	30,022	41,706,713	17,413,000	0	2,465,792
30	Dec 26, 2025 11:07	30,038	38,586,915	17,422,000	0	2,461,696
31	Dec 26, 2025 11:05	30,059	39,420,699	17,434,000	0	2,465,792
32	Dec 26, 2025 11:11	30,117	35,996,912	16,441,000	1,027,000	2,465,792
33	Dec 26, 2025 11:07	30,143	47,554,935	17,483,000	0	2,461,696
34	Dec 26, 2025 11:11	30,160	38,597,737	17,493,000	0	2,519,040
35	Dec 26, 2025 11:07	30,250	38,201,713	17,545,000	0	2,428,928
36	Dec 26, 2025 11:11	30,331	45,452,961	17,592,000	0	2,461,696
37	Dec 26, 2025 11:07	30,367	40,080,989	17,613,000	0	2,498,560
38	Dec 26, 2025 11:07	30,376	35,033,627	17,618,000	0	2,461,696
39	Dec 26, 2025 11:11	30,491	46,140,205	17,685,000	0	2,494,464
40	Dec 26, 2025 11:05	30,522	44,629,667	17,703,000	0	2,408,448
41	Dec 26, 2025 11:07	30,628	43,213,090	17,764,000	0	2,420,736
42	Dec 26, 2025 11:07	30,874	30,747,951	16,913,000	994,000	2,428,928
43	Dec 26, 2025 11:09	30,957	38,265,996	15,960,000	1,995,000	2,310,144

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