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 listMar 26, 2026 15:31

Dominique Garmier

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Challenge History

Date	Challenger	Cost	Type	Status
Jul 5, 2026 18:42	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 18:42	0	11,340,202	2,039,000	0	20,480	No answer to stdout. Died or killed?
2	Mar 26, 2026 15:28	7,614	21,634,429	3,312,000	1,104,000	2,314,240
3	Mar 26, 2026 15:33	7,621	25,194,743	3,315,000	1,105,000	2,334,720
4	Mar 26, 2026 15:34	7,634	22,254,078	3,321,000	1,107,000	2,486,272
5	Mar 26, 2026 15:34	7,636	24,372,182	4,429,000	0	2,285,568
6	Mar 26, 2026 15:33	7,660	21,205,449	4,443,000	0	2,318,336
7	Mar 26, 2026 15:33	7,698	21,536,725	3,349,000	1,116,000	2,318,336
8	Mar 26, 2026 15:28	7,717	21,164,101	2,238,000	2,238,000	2,482,176
9	Mar 26, 2026 15:33	7,719	25,213,289	3,358,000	1,119,000	2,482,176
10	Mar 26, 2026 15:28	7,748	21,370,212	4,494,000	0	2,318,336
11	Mar 26, 2026 15:35	7,752	23,606,948	3,372,000	1,124,000	2,326,528
12	Mar 26, 2026 15:30	7,766	21,117,819	3,378,000	1,126,000	2,322,432
13	Mar 26, 2026 15:34	7,769	20,275,211	4,506,000	0	2,281,472
14	Mar 26, 2026 15:33	7,810	24,322,568	3,398,000	1,132,000	2,482,176
15	Mar 26, 2026 15:31	7,810	20,487,621	2,265,000	2,265,000	2,314,240
16	Mar 26, 2026 15:29	7,814	23,044,056	3,399,000	1,133,000	2,486,272
17	Mar 26, 2026 15:28	7,821	22,228,595	2,268,000	2,268,000	2,330,624
18	Mar 26, 2026 15:28	7,828	21,088,295	3,405,000	1,135,000	2,318,336
19	Mar 26, 2026 15:33	7,862	21,521,069	3,420,000	1,140,000	2,318,336
20	Mar 26, 2026 15:31	7,862	23,525,286	4,560,000	0	2,318,336
21	Mar 26, 2026 15:29	7,864	23,601,787	3,421,000	1,140,000	2,424,832
22	Mar 26, 2026 15:28	7,883	27,464,752	3,429,000	1,143,000	2,326,528
23	Mar 26, 2026 15:28	7,891	19,235,994	3,433,000	1,144,000	2,273,280
24	Mar 26, 2026 15:33	7,893	19,453,531	2,289,000	2,289,000	2,318,336
25	Mar 26, 2026 15:28	7,898	21,103,025	3,436,000	1,145,000	2,277,376
26	Mar 26, 2026 15:29	7,900	25,789,403	3,437,000	1,145,000	2,277,376
27	Mar 26, 2026 15:35	7,903	25,182,061	2,292,000	2,292,000	2,314,240
28	Mar 26, 2026 15:33	7,921	23,707,818	2,297,000	2,297,000	2,322,432
29	Mar 26, 2026 15:33	7,933	26,114,822	3,451,000	1,150,000	2,318,336
30	Mar 26, 2026 15:35	7,938	20,431,973	3,453,000	1,151,000	2,428,928
31	Mar 26, 2026 15:30	7,952	23,178,563	3,459,000	1,153,000	2,326,528
32	Mar 26, 2026 15:35	7,953	21,751,227	3,460,000	1,153,000	2,269,184
33	Mar 26, 2026 15:31	7,955	27,480,519	4,614,000	0	2,273,280
34	Mar 26, 2026 15:35	7,966	21,288,475	3,465,000	1,155,000	2,482,176
35	Mar 26, 2026 15:29	7,969	22,262,727	4,622,000	0	2,342,912
36	Mar 26, 2026 15:28	7,976	25,006,512	3,470,000	1,156,000	2,318,336
37	Mar 26, 2026 15:28	7,990	21,248,721	3,476,000	1,158,000	2,322,432
38	Mar 26, 2026 15:31	7,993	22,001,260	2,318,000	2,318,000	2,318,336
39	Mar 26, 2026 15:35	7,997	21,475,103	3,479,000	1,159,000	2,322,432
40	Mar 26, 2026 15:35	8,007	30,627,377	3,483,000	1,161,000	2,326,528
41	Mar 26, 2026 15:34	8,016	29,158,563	3,487,000	1,162,000	2,322,432
42	Mar 26, 2026 15:29	8,028	21,360,580	3,492,000	1,164,000	2,433,024
43	Mar 26, 2026 15:28	8,029	21,818,213	3,493,000	1,164,000	2,273,280
44	Mar 26, 2026 15:34	8,048	21,327,316	4,668,000	0	2,322,432
45	Mar 26, 2026 15:37	8,059	21,275,646	3,506,000	1,168,000	2,322,432
46	Mar 26, 2026 15:37	8,067	26,021,645	4,679,000	0	2,342,912
47	Mar 26, 2026 15:33	8,072	21,357,466	4,682,000	0	2,433,024
48	Mar 26, 2026 15:33	8,078	21,637,959	3,514,000	1,171,000	2,322,432
49	Mar 26, 2026 15:35	8,103	22,196,742	3,525,000	1,175,000	2,326,528
50	Mar 26, 2026 15:28	8,107	23,202,112	3,527,000	1,175,000	2,322,432
51	Mar 26, 2026 15:31	8,112	22,224,328	4,705,000	0	2,273,280
52	Mar 26, 2026 15:31	8,148	20,531,439	3,545,000	1,181,000	2,330,624
53	Mar 26, 2026 15:28	8,162	24,108,589	4,734,000	0	2,478,080
54	Mar 26, 2026 15:28	8,172	20,527,855	3,555,000	1,185,000	2,342,912
55	Mar 26, 2026 15:31	8,174	24,934,712	3,556,000	1,185,000	2,322,432
56	Mar 26, 2026 15:30	8,183	27,192,621	3,560,000	1,186,000	2,330,624
57	Mar 26, 2026 15:34	8,190	22,109,644	3,563,000	1,187,000	2,273,280
58	Mar 26, 2026 15:37	8,219	21,932,739	4,767,000	0	2,269,184
59	Mar 26, 2026 15:28	8,221	21,614,763	2,384,000	2,384,000	2,314,240
60	Mar 26, 2026 15:29	8,276	25,054,276	3,600,000	1,200,000	2,326,528
61	Mar 26, 2026 15:35	8,303	22,508,961	3,612,000	1,204,000	2,269,184
62	Mar 26, 2026 15:31	8,307	23,825,969	3,614,000	1,204,000	2,326,528
63	Mar 26, 2026 15:33	8,517	25,154,095	2,964,000	1,976,000	2,478,080
64	Mar 26, 2026 15:31	8,678	22,358,034	3,020,000	2,013,000	2,318,336

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