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 19, 2025 02:13

Wookyung Jeong

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Challenge History

Date	Challenger	Cost	Type	Status
Jul 5, 2026 21:05	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 21:06	0	31,348,802	21,935,000	0	16,384	No answer to stdout. Died or killed?
2	Dec 19, 2025 02:12	31,624	45,328,394	17,323,000	1,019,000	2,510,848
3	Dec 18, 2025 17:21	31,955	43,364,412	17,505,000	1,029,000	2,269,184
4	Dec 18, 2025 17:18	32,022	42,311,218	17,542,000	1,031,000	2,510,848
5	Dec 18, 2025 17:18	32,090	41,558,617	17,578,000	1,034,000	2,293,760
6	Dec 18, 2025 17:18	32,133	35,116,115	17,602,000	1,035,000	2,490,368
7	Dec 18, 2025 17:19	32,343	48,447,425	18,759,000	0	2,289,664
8	Dec 19, 2025 02:12	32,555	51,458,102	17,889,000	993,000	2,498,560
9	Dec 18, 2025 17:18	32,598	39,327,757	17,912,000	995,000	2,306,048
10	Dec 18, 2025 17:18	32,598	43,213,523	17,912,000	995,000	2,502,656
11	Dec 19, 2025 02:13	32,678	46,415,174	17,956,000	997,000	2,269,184
12	Dec 18, 2025 17:20	32,705	41,727,778	17,971,000	998,000	2,506,752
13	Dec 19, 2025 02:12	32,716	41,522,541	16,978,000	1,997,000	2,494,464
14	Dec 18, 2025 17:18	32,826	41,532,975	17,035,000	2,004,000	2,461,696
15	Dec 18, 2025 17:21	32,834	42,347,988	17,040,000	2,004,000	2,342,912
16	Dec 18, 2025 17:18	32,847	39,585,819	16,043,000	3,008,000	2,457,600
17	Dec 18, 2025 17:19	32,860	42,191,959	18,056,000	1,003,000	2,498,560
18	Dec 18, 2025 17:20	32,878	44,304,706	17,062,000	2,007,000	2,502,656
19	Dec 19, 2025 02:12	32,881	45,886,316	17,064,000	2,007,000	2,465,792
20	Dec 18, 2025 17:20	32,917	41,236,434	18,088,000	1,004,000	2,510,848
21	Dec 18, 2025 17:20	32,933	45,639,778	17,091,000	2,010,000	2,338,816
22	Dec 19, 2025 02:12	32,943	40,590,152	18,102,000	1,005,000	2,490,368
23	Dec 19, 2025 02:12	32,971	44,088,092	17,110,000	2,013,000	2,502,656
24	Dec 19, 2025 02:12	32,991	42,958,283	17,121,000	2,014,000	2,478,080
25	Dec 19, 2025 02:12	32,993	38,745,445	17,122,000	2,014,000	2,285,568
26	Dec 18, 2025 17:20	33,000	42,645,553	18,133,000	1,007,000	2,465,792
27	Dec 18, 2025 17:19	33,002	43,752,385	17,127,000	2,014,000	2,281,472
28	Dec 18, 2025 17:19	33,057	43,008,726	18,164,000	1,009,000	2,510,848
29	Dec 18, 2025 17:18	33,062	39,797,017	17,158,000	2,018,000	2,256,896
30	Dec 18, 2025 17:18	33,081	41,695,880	18,178,000	1,009,000	2,260,992
31	Dec 18, 2025 17:18	33,109	42,657,128	18,193,000	1,010,000	2,510,848
32	Dec 18, 2025 17:19	33,136	41,890,922	17,196,000	2,023,000	2,273,280
33	Dec 19, 2025 02:12	33,136	36,402,738	17,196,000	2,023,000	2,506,752
34	Dec 18, 2025 17:20	33,136	42,782,244	17,196,000	2,023,000	2,387,968
35	Dec 19, 2025 02:12	33,140	34,561,487	16,186,000	3,035,000	2,461,696
36	Dec 18, 2025 17:18	33,155	43,582,312	18,218,000	1,012,000	2,506,752
37	Dec 18, 2025 17:19	33,207	41,584,501	18,247,000	1,013,000	2,408,448
38	Dec 18, 2025 17:21	33,252	40,526,950	18,271,000	1,015,000	2,461,696
39	Dec 18, 2025 17:21	33,260	45,414,393	19,291,000	0	2,457,600
40	Dec 18, 2025 17:19	33,272	42,411,907	17,267,000	2,031,000	2,494,464
41	Dec 18, 2025 17:19	33,284	41,494,389	18,289,000	1,016,000	2,510,848
42	Dec 18, 2025 17:21	33,295	46,757,945	18,295,000	1,016,000	2,273,280
43	Dec 18, 2025 17:18	33,343	43,037,062	18,322,000	1,017,000	2,482,176
44	Dec 19, 2025 02:12	33,376	42,491,076	19,358,000	0	2,486,272
45	Dec 19, 2025 02:13	33,416	42,617,392	18,361,000	1,020,000	2,461,696
46	Dec 18, 2025 17:19	33,491	50,775,706	19,425,000	0	2,416,640
47	Dec 19, 2025 02:13	33,505	55,246,484	18,411,000	1,022,000	2,428,928
48	Dec 19, 2025 02:12	33,764	39,634,235	18,553,000	1,030,000	2,453,504
49	Dec 18, 2025 17:21	33,886	42,913,076	18,620,000	1,034,000	2,387,968

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