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 23, 2025 15:27

Josu San Martin

Error

Source Code

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

Challenge History

Date	Challenger	Cost	Type	Status
Sep 15, 2026 12:22	Andrew Epstein	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Sep 15, 2026 12:26	0	10,974,937	975,000	0	24,576	No answer to stdout. Died or killed?
2	Dec 23, 2025 15:11	34,307	44,531,955	18,904,000	994,000	2,461,696
3	Dec 23, 2025 15:25	34,328	46,506,579	19,910,000	0	2,428,928
4	Dec 23, 2025 15:11	34,336	48,673,800	17,924,000	1,991,000	2,404,352
5	Dec 25, 2025 01:31	34,645	47,113,018	18,085,000	2,009,000	2,441,216
6	Dec 23, 2025 15:11	35,034	42,202,827	20,320,000	0	2,392,064
7	Dec 23, 2025 15:11	35,116	48,039,610	20,367,000	0	2,437,120
8	Dec 25, 2025 01:31	35,217	47,369,589	20,426,000	0	2,473,984
9	Dec 23, 2025 15:27	35,538	46,045,655	20,612,000	0	2,379,776
10	Dec 23, 2025 15:10	35,545	45,516,921	19,586,000	1,030,000	2,400,256
11	Dec 23, 2025 15:11	35,645	46,439,921	19,641,000	1,033,000	2,486,272
12	Dec 23, 2025 15:10	35,667	48,660,557	20,687,000	0	2,437,120
13	Dec 23, 2025 15:11	35,697	43,748,533	19,669,000	1,035,000	2,445,312
14	Dec 23, 2025 15:11	35,709	48,768,955	19,676,000	1,035,000	2,367,488
15	Dec 23, 2025 15:11	36,009	42,332,976	19,891,000	994,000	2,277,376
16	Dec 25, 2025 01:29	36,036	46,763,861	18,911,000	1,990,000	2,351,104
17	Dec 23, 2025 15:11	36,040	39,075,713	20,903,000	0	2,359,296
18	Dec 23, 2025 15:11	36,043	47,652,303	20,905,000	0	2,437,120
19	Dec 23, 2025 15:26	36,284	49,304,007	20,043,000	1,002,000	2,506,752
20	Dec 25, 2025 01:31	36,293	51,000,996	19,046,000	2,004,000	2,326,528
21	Dec 23, 2025 15:11	36,359	53,404,469	20,084,000	1,004,000	2,297,856
22	Dec 25, 2025 01:29	36,391	44,841,357	19,097,000	2,010,000	2,289,664
23	Dec 23, 2025 15:11	36,395	47,367,213	19,099,000	2,010,000	2,301,952
24	Dec 23, 2025 15:11	36,409	47,737,551	20,112,000	1,005,000	2,330,624
25	Dec 23, 2025 15:11	36,412	50,037,548	20,114,000	1,005,000	2,453,504
26	Dec 23, 2025 15:11	36,424	44,545,545	19,114,000	2,012,000	2,297,856
27	Dec 23, 2025 15:26	36,560	46,513,828	19,186,000	2,019,000	2,293,760
28	Dec 23, 2025 15:26	36,579	43,976,348	20,206,000	1,010,000	2,437,120
29	Dec 23, 2025 15:11	36,634	44,706,971	20,237,000	1,011,000	2,420,736
30	Dec 23, 2025 15:11	36,650	45,045,446	19,233,000	2,024,000	2,342,912
31	Dec 23, 2025 15:11	36,683	47,259,144	20,263,000	1,013,000	2,404,352
32	Dec 25, 2025 01:29	36,750	42,325,581	19,285,000	2,030,000	2,392,064
33	Dec 23, 2025 15:25	36,876	42,903,034	21,388,000	0	2,371,584
34	Dec 23, 2025 15:10	36,909	50,790,194	20,388,000	1,019,000	2,269,184
35	Dec 23, 2025 15:27	37,076	50,264,767	21,504,000	0	2,514,944
36	Dec 23, 2025 15:25	37,124	46,050,904	20,507,000	1,025,000	2,363,392
37	Dec 23, 2025 15:27	37,169	43,735,717	21,558,000	0	2,355,200

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