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 21:15	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 21:15	0	8,467,542	849,000	0	20,480	No answer to stdout. Died or killed?
2	Dec 21, 2025 01:48	32,802	43,502,570	17,023,000	2,002,000	2,433,024
3	Dec 21, 2025 01:48	33,009	42,982,878	17,130,000	2,015,000	2,433,024
4	Dec 21, 2025 01:41	33,028	46,172,277	18,148,000	1,008,000	2,424,832
5	Dec 21, 2025 01:55	33,228	42,986,978	18,258,000	1,014,000	2,531,328
6	Dec 21, 2025 01:40	33,416	44,683,867	18,361,000	1,020,000	2,531,328
7	Dec 21, 2025 01:55	33,867	49,801,903	19,643,000	0	2,420,736
8	Dec 21, 2025 01:40	33,905	48,153,724	18,630,000	1,035,000	2,531,328
9	Dec 21, 2025 01:55	34,021	44,142,092	19,732,000	0	2,523,136
10	Dec 21, 2025 01:40	34,317	45,096,765	17,914,000	1,990,000	2,424,832
11	Dec 21, 2025 01:41	34,326	45,586,087	18,914,000	995,000	2,269,184
12	Dec 21, 2025 01:55	34,676	46,830,815	18,101,000	2,011,000	2,523,136
13	Dec 21, 2025 01:40	34,759	42,937,728	19,152,000	1,008,000	2,424,832
14	Dec 21, 2025 01:41	34,897	37,205,773	18,216,000	2,024,000	2,527,232
15	Dec 21, 2025 01:40	34,969	43,584,224	20,282,000	0	2,531,328
16	Dec 21, 2025 01:48	34,976	43,353,740	18,258,000	2,028,000	2,531,328
17	Dec 21, 2025 01:48	35,155	40,847,010	18,351,000	2,039,000	2,420,736
18	Dec 21, 2025 01:55	35,498	47,605,245	19,560,000	1,029,000	2,424,832
19	Dec 21, 2025 01:48	35,586	48,246,772	19,608,000	1,032,000	2,531,328
20	Dec 21, 2025 01:41	35,978	48,564,483	18,880,000	1,987,000	2,428,928
21	Dec 21, 2025 01:55	36,040	49,031,305	18,913,000	1,990,000	2,523,136
22	Dec 21, 2025 01:41	36,045	46,897,008	19,911,000	995,000	2,523,136
23	Dec 21, 2025 01:48	36,052	39,816,179	19,915,000	995,000	2,531,328
24	Dec 21, 2025 01:55	36,157	43,320,148	18,974,000	1,997,000	2,416,640
25	Dec 21, 2025 01:40	36,316	43,822,929	19,057,000	2,006,000	2,523,136
26	Dec 21, 2025 01:55	36,317	42,781,704	19,058,000	2,006,000	2,523,136
27	Dec 21, 2025 01:48	36,322	48,200,350	20,064,000	1,003,000	2,416,640
28	Dec 21, 2025 01:55	36,347	46,727,770	19,074,000	2,007,000	2,523,136
29	Dec 21, 2025 01:48	36,366	41,483,355	19,084,000	2,008,000	2,420,736
30	Dec 21, 2025 01:48	36,453	44,587,392	19,130,000	2,013,000	2,523,136
31	Dec 21, 2025 01:55	36,614	38,448,523	20,225,000	1,011,000	2,523,136
32	Dec 21, 2025 01:41	36,822	42,232,814	20,340,000	1,017,000	2,420,736
33	Dec 21, 2025 01:55	36,864	44,288,674	21,381,000	0	2,416,640
34	Dec 21, 2025 01:55	37,048	41,157,344	20,465,000	1,023,000	2,420,736

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