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 22, 2025 00:10

Hattonuri

Error

Source Code

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

Challenge History

Date	Challenger	Cost	Type	Status
Jul 5, 2026 20:56	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 20:56	0	2,753,469,017	2,745,479,000	0	16,384	No answer to stdout. Died or killed?
2	Dec 21, 2025 23:57	30,057	40,038,623	16,408,000	1,025,000	2,510,848
3	Dec 21, 2025 23:56	30,148	42,827,510	16,458,000	1,028,000	2,453,504
4	Dec 22, 2025 00:23	30,153	42,777,154	17,489,000	0	2,531,328
5	Dec 22, 2025 00:12	30,350	32,963,677	17,603,000	0	2,306,048
6	Dec 22, 2025 00:12	30,509	43,910,899	17,695,000	0	2,461,696
7	Dec 22, 2025 00:23	30,603	48,990,672	16,706,000	1,044,000	2,498,560
8	Dec 22, 2025 00:10	30,603	43,986,114	16,706,000	1,044,000	2,510,848
9	Dec 22, 2025 00:10	30,807	32,477,021	16,876,000	992,000	2,482,176
10	Dec 22, 2025 00:10	30,859	41,211,377	15,910,000	1,988,000	2,510,848
11	Dec 22, 2025 00:22	30,864	38,575,524	16,907,000	994,000	2,510,848
12	Dec 22, 2025 00:10	30,872	47,692,609	16,912,000	994,000	2,318,336
13	Dec 22, 2025 00:25	30,881	44,011,276	16,916,000	995,000	2,301,952
14	Dec 22, 2025 00:10	30,886	43,714,947	17,914,000	0	2,510,848
15	Dec 22, 2025 00:01	30,962	35,259,661	16,961,000	997,000	2,502,656
16	Dec 21, 2025 23:57	31,010	42,259,259	16,987,000	999,000	2,289,664
17	Dec 22, 2025 00:23	31,022	36,873,999	16,994,000	999,000	2,502,656
18	Dec 21, 2025 23:56	31,097	42,326,579	17,034,000	1,002,000	2,449,408
19	Dec 22, 2025 00:23	31,169	38,533,691	17,074,000	1,004,000	2,519,040
20	Dec 22, 2025 00:22	31,266	42,464,431	17,127,000	1,007,000	2,314,240
21	Dec 22, 2025 00:22	31,334	45,287,199	16,155,000	2,019,000	2,486,272
22	Dec 22, 2025 00:10	31,588	39,396,506	17,304,000	1,017,000	2,293,760
23	Dec 22, 2025 00:01	31,748	35,810,640	17,391,000	1,023,000	2,301,952
24	Dec 22, 2025 00:10	31,762	46,712,901	18,422,000	0	2,293,760
25	Dec 22, 2025 00:22	31,776	35,688,357	18,430,000	0	2,465,792
26	Dec 22, 2025 00:22	31,824	37,807,645	17,433,000	1,025,000	2,351,104
27	Dec 22, 2025 00:25	31,890	39,172,066	17,469,000	1,027,000	2,322,432
28	Dec 22, 2025 00:01	32,209	47,567,814	18,681,000	0	2,392,064
29	Dec 22, 2025 00:10	32,233	43,104,343	18,695,000	0	2,502,656
30	Dec 22, 2025 00:25	32,248	34,711,915	18,704,000	0	2,396,160
31	Dec 22, 2025 00:22	32,353	44,810,918	17,723,000	1,042,000	2,437,120
32	Dec 22, 2025 00:12	32,362	44,419,142	18,770,000	0	2,424,832
33	Dec 21, 2025 23:56	32,591	43,547,044	16,914,000	1,989,000	2,412,544
34	Dec 22, 2025 00:10	32,605	49,599,539	16,921,000	1,990,000	2,375,680
35	Dec 22, 2025 00:23	32,662	39,037,916	16,950,000	1,994,000	2,433,024
36	Dec 22, 2025 00:23	32,824	39,094,337	18,036,000	1,002,000	2,408,448
37	Dec 21, 2025 23:57	33,847	43,280,600	18,598,000	1,033,000	2,531,328

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