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 14:51

Josu San Martin

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Challenge History

Date	Challenger	Cost	Type	Status
Sep 15, 2026 12:21	Andrew Epstein	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Sep 15, 2026 12:24	0	10,652,741	701,000	0	20,480	No answer to stdout. Died or killed?
2	Dec 23, 2025 14:51	33,616	50,212,505	18,471,000	1,026,000	2,486,272
3	Dec 23, 2025 14:50	33,953	37,866,307	19,693,000	0	2,265,088
4	Dec 23, 2025 14:53	34,317	50,731,330	17,914,000	1,990,000	2,494,464
5	Dec 23, 2025 14:51	34,321	45,157,693	17,916,000	1,990,000	2,449,408
6	Dec 23, 2025 14:53	34,510	44,255,495	18,015,000	2,001,000	2,465,792
7	Dec 23, 2025 14:53	34,657	42,684,142	18,091,000	2,010,000	2,494,464
8	Dec 23, 2025 14:51	34,784	41,119,317	19,167,000	1,008,000	2,506,752
9	Dec 23, 2025 14:51	34,831	50,986,358	18,182,000	2,020,000	2,461,696
10	Dec 23, 2025 14:51	35,048	43,768,278	19,312,000	1,016,000	2,441,216
11	Dec 23, 2025 14:50	35,229	39,377,084	19,412,000	1,021,000	2,285,568
12	Dec 23, 2025 14:53	35,319	42,834,542	19,461,000	1,024,000	2,441,216
13	Dec 23, 2025 14:53	35,374	49,314,855	19,492,000	1,025,000	2,453,504
14	Dec 23, 2025 14:53	35,383	53,185,256	19,496,000	1,026,000	2,428,928
15	Dec 23, 2025 14:51	35,502	46,931,969	19,562,000	1,029,000	2,473,984
16	Dec 23, 2025 14:53	35,526	38,000,470	19,575,000	1,030,000	2,416,640
17	Dec 23, 2025 14:51	35,690	47,071,676	20,700,000	0	2,265,088
18	Dec 23, 2025 14:51	36,033	43,849,655	18,909,000	1,990,000	2,412,544
19	Dec 23, 2025 14:51	36,086	50,723,557	18,937,000	1,993,000	2,441,216
20	Dec 23, 2025 14:53	36,100	51,988,638	19,941,000	997,000	2,334,720
21	Dec 23, 2025 14:51	36,109	41,275,548	20,943,000	0	2,437,120
22	Dec 23, 2025 14:53	36,279	47,014,309	20,040,000	1,002,000	2,416,640
23	Dec 23, 2025 14:53	36,448	43,993,990	20,134,000	1,006,000	2,416,640
24	Dec 23, 2025 14:53	36,512	49,622,934	19,161,000	2,016,000	2,371,584
25	Dec 23, 2025 14:53	36,569	42,678,663	19,190,000	2,020,000	2,453,504
26	Dec 23, 2025 14:53	36,709	42,415,823	20,278,000	1,013,000	2,416,640
27	Dec 23, 2025 14:50	36,741	50,157,507	20,296,000	1,014,000	2,420,736
28	Dec 23, 2025 14:53	36,940	42,784,185	20,405,000	1,020,000	2,428,928
29	Dec 23, 2025 14:51	37,010	42,096,557	20,444,000	1,022,000	2,334,720
30	Dec 23, 2025 14:51	37,016	38,115,368	21,469,000	0	2,433,024
31	Dec 23, 2025 14:51	37,145	44,967,886	20,519,000	1,025,000	2,363,392
32	Dec 23, 2025 14:53	37,372	48,858,552	20,644,000	1,032,000	2,273,280
33	Dec 23, 2025 14:51	37,455	53,051,317	21,724,000	0	2,465,792
34	Dec 23, 2025 14:51	37,502	47,778,870	20,716,000	1,035,000	2,338,816

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