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	1:20.1.2-0ubuntu1~24.04.2	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.
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	3.0.13-0ubuntu3.9	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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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Apr 24, 2021 09:08	0	0	0	0	0	no run stats recorded
2	Feb 24, 2026 16:32	3,238	15,781,393	1,878,000	0	2,420,736
3	Feb 24, 2026 16:33	3,312	21,386,132	0	1,921,000	2,322,432
4	Feb 24, 2026 17:01	3,316	19,589,327	1,923,000	0	2,355,200
5	Feb 24, 2026 16:34	3,331	21,447,502	0	1,932,000	2,363,392
6	Feb 24, 2026 17:01	3,336	18,147,867	1,935,000	0	2,400,256
7	Feb 24, 2026 16:33	3,383	25,361,447	0	1,962,000	2,396,160
8	Feb 24, 2026 16:32	3,390	19,186,891	0	1,966,000	2,371,584
9	Feb 24, 2026 16:37	3,390	19,841,973	983,000	983,000	2,347,008
10	Feb 24, 2026 16:33	3,403	15,921,111	987,000	987,000	2,387,968
11	Feb 24, 2026 17:01	3,410	20,376,589	989,000	989,000	2,359,296
12	Feb 24, 2026 17:01	3,433	19,004,139	0	1,991,000	2,359,296
13	Feb 24, 2026 16:37	3,433	18,786,537	0	1,991,000	2,359,296
14	Feb 24, 2026 17:01	3,433	19,428,677	0	1,991,000	2,404,352
15	Feb 24, 2026 16:34	3,436	19,118,646	0	1,993,000	2,404,352
16	Feb 24, 2026 17:01	3,441	20,713,637	998,000	998,000	2,387,968
17	Feb 24, 2026 17:01	3,448	19,755,492	0	2,000,000	2,383,872
18	Feb 24, 2026 17:01	3,455	18,306,179	0	2,004,000	2,367,488
19	Feb 24, 2026 16:32	3,460	22,471,289	0	2,007,000	2,355,200
20	Feb 24, 2026 16:34	3,460	17,914,636	0	2,007,000	2,371,584
21	Feb 24, 2026 16:34	3,462	18,876,114	1,004,000	1,004,000	2,379,776
22	Feb 24, 2026 17:00	3,462	19,761,467	0	2,008,000	2,392,064
23	Feb 24, 2026 17:00	3,471	18,934,864	0	2,013,000	2,342,912
24	Feb 24, 2026 16:37	3,479	18,685,794	0	2,018,000	2,400,256
25	Feb 24, 2026 16:32	3,483	17,427,624	1,010,000	1,010,000	2,383,872
26	Feb 24, 2026 16:39	3,490	16,766,324	0	2,024,000	2,404,352
27	Feb 24, 2026 17:01	3,490	17,646,645	0	2,024,000	2,375,680
28	Feb 24, 2026 16:33	3,490	21,220,041	0	2,024,000	2,400,256
29	Feb 24, 2026 16:32	3,574	18,969,575	0	2,073,000	2,375,680
30	Feb 24, 2026 16:40	3,584	17,215,092	0	2,079,000	2,330,624
31	Feb 24, 2026 17:00	3,612	17,647,876	0	2,095,000	2,363,392
32	Feb 24, 2026 16:40	3,622	16,216,902	0	2,101,000	2,367,488
33	Feb 24, 2026 16:35	3,669	15,641,735	0	2,128,000	2,383,872
34	Feb 24, 2026 16:32	3,762	26,025,087	0	2,182,000	2,322,432
35	Feb 24, 2026 16:39	3,828	19,223,196	1,110,000	1,110,000	2,400,256
36	Feb 24, 2026 16:33	3,907	16,598,941	0	2,266,000	2,396,160
37	Feb 24, 2026 16:36	3,950	16,668,879	0	2,291,000	2,375,680
38	Feb 24, 2026 16:33	3,962	17,491,915	0	2,298,000	2,371,584
39	Feb 24, 2026 16:35	3,962	16,201,777	0	2,298,000	2,371,584
40	Feb 24, 2026 16:40	3,964	17,344,153	0	2,299,000	2,301,952
41	Feb 24, 2026 16:39	4,003	17,686,533	0	2,322,000	2,293,760
42	Feb 24, 2026 16:35	4,010	16,516,841	0	2,326,000	2,375,680
43	Feb 24, 2026 16:35	4,041	22,097,274	0	2,344,000	2,396,160
44	Feb 24, 2026 16:32	4,059	15,598,271	0	2,354,000	2,404,352
45	Feb 24, 2026 16:35	4,079	17,841,118	1,183,000	1,183,000	2,383,872
46	Feb 24, 2026 16:35	4,091	16,879,551	0	2,373,000	2,400,256
47	Feb 24, 2026 16:32	4,117	19,921,845	0	2,388,000	2,363,392
48	Feb 24, 2026 16:36	4,140	19,582,075	0	2,401,000	2,363,392
49	Feb 24, 2026 16:36	4,207	22,504,498	0	2,440,000	2,289,664
50	Feb 24, 2026 16:34	4,219	26,490,871	0	2,447,000	2,289,664
51	Feb 24, 2026 16:36	4,234	19,800,973	1,228,000	1,228,000	2,400,256
52	Feb 24, 2026 16:34	4,317	15,342,558	1,252,000	1,252,000	2,408,448
53	Feb 24, 2026 16:36	4,341	22,072,987	1,259,000	1,259,000	2,387,968
54	Feb 24, 2026 16:32	4,407	17,456,197	0	2,556,000	2,412,544
55	Feb 24, 2026 16:36	4,434	18,180,220	1,286,000	1,286,000	2,318,336

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