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 20:47	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 20:48	0	2,767,564,980	2,759,646,000	0	2,117,632	expected "999999000 ", got "100000 "
2	Jul 5, 2026 20:48	0	2,768,055,938	2,758,736,000	1,242,000	2,117,632	expected "999999000 ", got "100000 "
3	Jul 5, 2026 20:48	0	2,769,526,906	2,759,842,000	0	2,117,632	expected "999999000 ", got "100000 "
4	Dec 25, 2025 11:24	28,722	37,509,678	16,659,000	0	2,523,136
5	Dec 25, 2025 09:53	28,764	42,981,185	16,683,000	0	2,498,560
6	Dec 25, 2025 09:51	28,853	40,688,203	16,735,000	0	2,490,368
7	Dec 25, 2025 09:48	28,900	39,022,723	16,762,000	0	2,510,848
8	Dec 25, 2025 09:50	29,148	44,976,475	16,906,000	0	2,334,720
9	Dec 25, 2025 11:26	29,171	30,751,094	16,919,000	0	2,322,432
10	Dec 25, 2025 12:54	29,217	35,479,184	15,950,000	996,000	2,498,560
11	Dec 25, 2025 12:06	29,310	41,092,674	16,000,000	1,000,000	2,314,240
12	Dec 25, 2025 09:51	29,409	39,884,933	16,054,000	1,003,000	2,535,424
13	Dec 25, 2025 12:54	29,512	41,725,408	16,111,000	1,006,000	2,322,432
14	Dec 25, 2025 09:49	29,517	40,099,444	16,113,000	1,007,000	2,486,272
15	Dec 25, 2025 12:07	29,576	42,206,599	15,136,000	2,018,000	2,510,848
16	Dec 25, 2025 09:49	29,612	38,555,732	16,165,000	1,010,000	2,498,560
17	Dec 25, 2025 13:01	29,729	39,560,728	17,243,000	0	2,482,176
18	Dec 25, 2025 09:51	29,766	36,568,779	17,264,000	0	2,478,080
19	Dec 25, 2025 09:50	29,853	45,917,431	17,315,000	0	2,293,760
20	Dec 25, 2025 09:50	29,871	33,695,822	16,306,000	1,019,000	2,519,040
21	Dec 25, 2025 11:26	29,871	37,546,289	17,325,000	0	2,449,408
22	Dec 25, 2025 12:54	29,967	35,802,777	17,381,000	0	2,330,624
23	Dec 25, 2025 12:54	30,067	37,318,225	16,414,000	1,025,000	2,301,952
24	Dec 25, 2025 09:48	30,134	34,092,060	17,478,000	0	2,494,464
25	Dec 25, 2025 12:10	30,148	38,794,857	17,486,000	0	2,457,600
26	Dec 25, 2025 09:52	30,152	40,053,736	17,488,000	0	2,506,752
27	Dec 25, 2025 13:01	30,253	38,170,949	17,547,000	0	2,506,752
28	Dec 25, 2025 09:49	30,267	45,419,346	17,555,000	0	2,301,952
29	Dec 25, 2025 12:10	30,321	40,332,793	17,586,000	0	2,498,560
30	Dec 25, 2025 11:24	30,328	43,501,045	17,590,000	0	2,531,328
31	Dec 25, 2025 09:53	30,334	41,286,627	17,594,000	0	2,318,336
32	Dec 25, 2025 09:49	30,350	37,496,310	17,603,000	0	2,457,600
33	Dec 25, 2025 12:06	30,376	44,708,104	16,582,000	1,036,000	2,482,176
34	Dec 25, 2025 09:50	30,381	37,502,993	16,585,000	1,036,000	2,318,336
35	Dec 25, 2025 09:51	30,383	40,201,205	16,586,000	1,036,000	2,314,240
36	Dec 25, 2025 12:07	30,447	42,436,603	17,659,000	0	2,461,696
37	Dec 25, 2025 09:52	30,455	45,015,431	17,664,000	0	2,265,088
38	Dec 25, 2025 11:27	30,484	42,975,630	17,681,000	0	2,424,832
39	Dec 25, 2025 12:54	30,509	44,727,147	16,655,000	1,040,000	2,322,432
40	Dec 25, 2025 13:01	30,509	44,771,836	17,695,000	0	2,478,080
41	Dec 25, 2025 09:48	30,571	39,787,312	16,688,000	1,043,000	2,371,584
42	Dec 25, 2025 09:50	30,581	42,615,367	16,694,000	1,043,000	2,478,080
43	Dec 25, 2025 09:51	30,598	45,001,278	17,747,000	0	2,416,640
44	Dec 25, 2025 09:51	30,626	43,418,570	17,763,000	0	2,310,144
45	Dec 25, 2025 12:54	30,866	43,176,844	16,908,000	994,000	2,502,656
46	Dec 25, 2025 12:54	30,867	44,784,850	16,909,000	994,000	2,285,568
47	Dec 25, 2025 11:24	30,874	44,743,468	17,907,000	0	2,506,752
48	Dec 25, 2025 09:49	30,876	47,932,638	16,914,000	994,000	2,310,144
49	Dec 25, 2025 09:49	30,879	45,410,715	16,915,000	995,000	2,502,656
50	Dec 25, 2025 12:06	30,891	30,724,742	16,922,000	995,000	2,453,504
51	Dec 25, 2025 12:06	30,895	42,818,491	16,924,000	995,000	2,301,952
52	Dec 25, 2025 09:51	30,910	45,329,802	16,932,000	996,000	2,269,184
53	Dec 25, 2025 12:06	30,947	46,927,785	15,955,000	1,994,000	2,314,240
54	Dec 25, 2025 09:52	31,012	38,643,077	15,989,000	1,998,000	2,469,888
55	Dec 25, 2025 09:51	31,045	38,915,204	17,006,000	1,000,000	2,469,888
56	Dec 25, 2025 11:27	31,124	35,484,932	17,050,000	1,002,000	2,416,640
57	Dec 25, 2025 12:54	31,241	40,883,795	17,114,000	1,006,000	2,441,216
58	Dec 25, 2025 11:26	31,253	41,029,393	17,120,000	1,007,000	2,510,848
59	Dec 25, 2025 09:51	31,466	47,212,939	17,237,000	1,013,000	2,420,736
60	Dec 25, 2025 12:07	31,505	38,492,784	17,258,000	1,015,000	2,473,984
61	Dec 25, 2025 12:06	31,548	40,319,723	18,298,000	0	2,506,752
62	Dec 25, 2025 12:10	31,550	42,700,336	17,283,000	1,016,000	2,482,176
63	Dec 25, 2025 12:54	31,662	38,396,807	18,364,000	0	2,424,832
64	Dec 25, 2025 09:53	31,762	53,451,620	18,422,000	0	2,424,832
65	Dec 25, 2025 11:27	31,886	43,546,379	18,494,000	0	2,433,024
66	Dec 25, 2025 09:50	31,905	43,452,919	18,505,000	0	2,404,352

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