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 04:09

Josu San Martin

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Challenge History

Date	Challenger	Cost	Type	Status
Sep 15, 2026 21:10	Andrew Epstein	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Sep 15, 2026 21:13	0	10,674,268	781,000	0	20,480	No answer to stdout. Died or killed?
2	Dec 21, 2025 04:08	35,281	44,829,450	20,463,000	0	2,273,280
3	Dec 21, 2025 04:10	35,362	49,168,757	19,485,000	1,025,000	2,490,368
4	Dec 21, 2025 03:36	35,388	45,290,168	20,525,000	0	2,523,136
5	Dec 21, 2025 03:38	35,443	42,541,272	20,557,000	0	2,482,176
6	Dec 21, 2025 04:09	36,052	46,805,733	18,919,000	1,991,000	2,387,968
7	Dec 21, 2025 04:09	36,134	49,569,959	18,962,000	1,996,000	2,400,256
8	Dec 21, 2025 04:08	36,260	44,654,325	20,030,000	1,001,000	2,469,888
9	Dec 21, 2025 04:09	36,297	44,107,108	19,047,000	2,005,000	2,392,064
10	Dec 21, 2025 03:36	36,303	43,689,975	19,051,000	2,005,000	2,486,272
11	Dec 21, 2025 04:09	36,347	40,735,979	19,074,000	2,007,000	2,457,600
12	Dec 21, 2025 03:38	36,497	50,523,601	19,152,000	2,016,000	2,441,216
13	Dec 21, 2025 03:36	36,719	42,871,874	20,283,000	1,014,000	2,473,984
14	Dec 21, 2025 04:08	36,755	44,640,476	20,303,000	1,015,000	2,449,408
15	Dec 21, 2025 04:08	36,864	50,801,985	20,363,000	1,018,000	2,441,216
16	Dec 21, 2025 03:36	36,876	53,462,518	21,388,000	0	2,478,080
17	Dec 21, 2025 03:38	36,884	50,771,043	21,393,000	0	2,465,792
18	Dec 21, 2025 04:05	36,955	48,844,448	20,414,000	1,020,000	2,404,352
19	Dec 21, 2025 04:10	37,071	43,631,190	20,478,000	1,023,000	2,519,040
20	Dec 21, 2025 04:08	37,107	46,725,863	20,498,000	1,024,000	2,367,488
21	Dec 21, 2025 04:05	37,164	43,887,236	20,529,000	1,026,000	2,416,640
22	Dec 21, 2025 03:36	37,169	43,269,831	20,532,000	1,026,000	2,498,560
23	Dec 21, 2025 04:09	37,226	43,405,645	21,591,000	0	2,486,272
24	Dec 21, 2025 04:10	37,241	45,713,562	20,572,000	1,028,000	2,326,528
25	Dec 21, 2025 04:09	37,279	44,645,032	21,622,000	0	2,424,832
26	Dec 21, 2025 04:08	37,390	46,639,787	20,654,000	1,032,000	2,306,048
27	Dec 21, 2025 04:08	37,433	51,344,504	21,711,000	0	2,519,040
28	Dec 21, 2025 04:08	37,440	52,754,587	20,681,000	1,034,000	2,461,696
29	Dec 21, 2025 04:08	37,462	55,504,662	20,694,000	1,034,000	2,273,280
30	Dec 21, 2025 04:09	37,484	46,060,147	21,741,000	0	2,404,352
31	Dec 21, 2025 04:08	37,486	48,643,821	20,707,000	1,035,000	2,265,088
32	Dec 21, 2025 04:09	37,747	47,989,439	20,898,000	995,000	2,375,680
33	Dec 21, 2025 04:08	37,752	51,813,306	20,901,000	995,000	2,404,352
34	Dec 21, 2025 04:05	37,760	47,756,890	20,906,000	995,000	2,375,680
35	Dec 21, 2025 03:36	37,771	47,677,929	20,912,000	995,000	2,338,816
36	Dec 21, 2025 04:09	37,774	46,150,009	19,918,000	1,991,000	2,428,928
37	Dec 21, 2025 04:08	37,960	44,940,915	20,016,000	2,001,000	2,318,336

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