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.

Back to listDec 21, 2025 03:52

Josu San Martin

Error

Source Code

Source code access is restricted. Log in to request access.

Challenge History

Date	Challenger	Cost	Type	Status
Sep 15, 2026 21:23	Andrew Epstein	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Sep 15, 2026 21:54	0	10,602,881	784,000	0	20,480	No answer to stdout. Died or killed?
2	Dec 21, 2025 03:39	35,572	43,749,345	20,632,000	0	2,510,848
3	Dec 21, 2025 03:39	36,053	52,210,398	19,916,000	995,000	2,404,352
4	Dec 21, 2025 03:51	36,147	46,216,186	19,967,000	998,000	2,486,272
5	Dec 21, 2025 03:40	36,234	47,602,596	20,016,000	1,000,000	2,494,464
6	Dec 21, 2025 03:51	36,305	41,235,592	19,052,000	2,005,000	2,416,640
7	Dec 21, 2025 03:39	36,502	43,135,674	19,155,000	2,016,000	2,482,176
8	Dec 21, 2025 03:39	36,545	44,813,527	20,187,000	1,009,000	2,510,848
9	Dec 21, 2025 03:40	36,605	47,926,452	20,220,000	1,011,000	2,416,640
10	Dec 21, 2025 03:40	36,619	46,744,651	21,239,000	0	2,412,544
11	Dec 21, 2025 03:51	36,669	43,413,259	20,256,000	1,012,000	2,408,448
12	Dec 21, 2025 03:49	36,828	49,043,387	20,343,000	1,017,000	2,301,952
13	Dec 21, 2025 03:49	37,143	50,368,047	20,518,000	1,025,000	2,404,352
14	Dec 21, 2025 03:51	37,367	48,904,197	20,641,000	1,032,000	2,416,640
15	Dec 21, 2025 03:51	37,378	55,687,472	20,647,000	1,032,000	2,494,464
16	Dec 21, 2025 03:39	37,395	47,889,609	21,689,000	0	2,502,656
17	Dec 21, 2025 03:39	37,434	47,863,980	20,679,000	1,033,000	2,314,240
18	Dec 21, 2025 03:49	37,760	47,357,132	20,906,000	995,000	2,351,104
19	Dec 21, 2025 03:39	37,771	48,410,519	19,916,000	1,991,000	2,490,368
20	Dec 21, 2025 03:39	37,793	44,186,754	19,928,000	1,992,000	2,445,312
21	Dec 21, 2025 03:39	37,860	44,714,526	19,963,000	1,996,000	2,465,792
22	Dec 21, 2025 03:40	38,014	46,226,278	20,044,000	2,004,000	2,396,160
23	Dec 21, 2025 03:52	38,072	47,316,652	20,075,000	2,007,000	2,473,984
24	Dec 21, 2025 03:49	38,090	45,111,312	21,088,000	1,004,000	2,428,928
25	Dec 21, 2025 03:52	38,150	48,221,050	21,122,000	1,005,000	2,408,448
26	Dec 21, 2025 03:40	38,209	45,438,787	21,154,000	1,007,000	2,342,912
27	Dec 21, 2025 03:49	38,250	45,554,712	20,169,000	2,016,000	2,482,176
28	Dec 21, 2025 03:51	38,262	48,582,102	20,175,000	2,017,000	2,412,544
29	Dec 21, 2025 03:52	38,322	46,305,206	20,207,000	2,020,000	2,355,200
30	Dec 21, 2025 03:39	38,371	47,917,300	20,232,000	2,023,000	2,359,296
31	Dec 21, 2025 03:52	38,407	47,153,692	20,251,000	2,025,000	2,400,256
32	Dec 21, 2025 03:49	38,490	43,816,051	20,295,000	2,029,000	2,379,776
33	Dec 21, 2025 03:40	38,507	50,681,305	21,319,000	1,015,000	2,498,560
34	Dec 21, 2025 03:39	38,522	48,836,913	21,328,000	1,015,000	2,445,312
35	Dec 21, 2025 03:52	38,652	45,547,204	21,399,000	1,019,000	2,428,928
36	Dec 21, 2025 03:39	38,728	47,477,703	21,441,000	1,021,000	2,387,968
37	Dec 21, 2025 03:52	38,788	51,813,768	20,452,000	2,045,000	2,383,872

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