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.

Back to listMar 25, 2025 19:25

Aniruddha Deb

Score: 922,200

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Apr 19, 2025 19:36	772,771	475,207,563	445,206,000	3,001,000	2,420,736
2	Apr 19, 2025 19:36	777,166	472,934,860	446,759,000	3,997,000	2,420,736
3	Apr 19, 2025 19:32	781,338	474,326,896	453,176,000	0	2,428,928
4	Apr 19, 2025 19:45	783,143	485,463,066	452,223,000	2,000,000	2,416,640
5	Apr 19, 2025 19:36	790,212	486,883,547	458,323,000	0	2,433,024
6	Apr 19, 2025 19:32	791,076	477,795,166	454,826,000	3,998,000	2,400,256
7	Apr 19, 2025 19:36	791,684	479,424,121	458,177,000	1,000,000	2,424,832
8	Apr 19, 2025 19:45	807,395	498,534,846	467,289,000	1,000,000	2,506,752
9	Apr 19, 2025 19:36	813,183	497,478,846	468,649,000	2,997,000	2,408,448
10	Apr 19, 2025 19:37	817,493	496,887,199	472,146,000	2,000,000	2,392,064
11	Apr 19, 2025 19:36	817,828	501,610,434	471,338,000	3,002,000	2,416,640
12	Apr 19, 2025 19:36	820,048	515,346,591	473,630,000	1,998,000	2,383,872
13	Apr 19, 2025 19:36	823,919	504,800,814	474,874,000	2,999,000	2,387,968
14	Apr 19, 2025 19:36	826,924	504,709,481	478,617,000	999,000	2,379,776
15	Apr 19, 2025 19:45	827,353	500,304,514	476,866,000	2,999,000	2,383,872
16	Apr 19, 2025 19:45	832,966	504,510,052	481,120,000	2,000,000	2,363,392
17	Apr 19, 2025 19:36	837,064	512,183,006	483,500,000	1,997,000	2,367,488
18	Apr 19, 2025 19:36	849,678	515,870,840	490,814,000	1,999,000	2,281,472
19	Apr 19, 2025 19:45	854,759	519,903,420	493,761,000	1,999,000	2,355,200
20	Apr 19, 2025 19:32	875,590	527,888,866	505,843,000	1,999,000	2,359,296
21	Apr 19, 2025 19:36	878,324	536,037,353	505,433,000	3,995,000	2,392,064
22	Apr 19, 2025 19:37	890,322	542,704,673	515,387,000	1,000,000	2,457,600
23	Apr 19, 2025 19:32	895,562	545,438,807	518,426,000	1,000,000	2,396,160
24	Apr 19, 2025 19:36	897,172	541,728,281	517,364,000	2,996,000	2,392,064
25	Apr 19, 2025 19:36	901,053	545,494,854	520,613,000	1,998,000	2,367,488
26	Apr 19, 2025 19:45	904,845	546,835,763	521,812,000	2,998,000	2,387,968
27	Apr 19, 2025 19:36	911,712	552,656,751	525,795,000	2,998,000	2,281,472
28	Apr 19, 2025 19:36	922,200	556,983,825	533,877,000	999,000	2,383,872
29	Apr 19, 2025 19:45	934,138	572,913,624	538,802,000	2,998,000	2,392,064
30	Apr 19, 2025 19:32	943,574	568,032,804	545,272,000	2,001,000	2,363,392
31	Apr 19, 2025 19:45	946,507	569,748,348	543,975,000	4,999,000	2,457,600
32	Apr 19, 2025 19:45	948,905	575,894,824	548,364,000	2,001,000	2,371,584
33	Apr 19, 2025 19:37	961,452	579,214,936	553,645,000	3,997,000	2,281,472
34	Apr 19, 2025 19:32	964,745	585,635,718	558,553,000	999,000	2,351,104
35	Apr 19, 2025 19:32	966,747	588,304,053	559,714,000	999,000	2,392,064
36	Apr 19, 2025 19:36	1,040,807	622,482,879	602,669,000	999,000	2,330,624
37	Apr 19, 2025 19:32	1,043,086	633,199,797	602,991,000	1,999,000	2,404,352
38	Apr 19, 2025 19:36	1,049,519	633,820,454	607,722,000	999,000	2,326,528
39	Apr 19, 2025 19:32	1,076,566	649,878,449	621,411,000	2,997,000	2,338,816
40	Mar 25, 2025 19:21	2,109,457	1,248,533,064	1,219,487,000	3,998,000	2,375,680
41	Mar 25, 2025 19:21	2,118,816	1,253,873,715	1,225,914,000	2,999,000	2,453,504
42	Mar 25, 2025 19:25	2,127,424	1,255,930,266	1,232,907,000	999,000	2,326,528
43	Mar 25, 2025 19:25	2,129,559	1,262,360,493	1,234,145,000	999,000	2,359,296
44	Mar 25, 2025 19:21	2,133,507	1,259,689,690	1,234,436,000	2,998,000	2,322,432
45	Mar 25, 2025 19:21	2,137,693	1,264,402,498	1,236,863,000	2,999,000	2,310,144
46	Mar 25, 2025 19:25	2,139,171	1,261,192,029	1,237,720,000	2,999,000	2,367,488
47	Mar 25, 2025 19:25	2,146,012	1,275,759,001	1,241,688,000	2,999,000	2,359,296
48	Mar 25, 2025 19:25	2,150,447	1,267,820,021	1,242,262,000	4,997,000	2,404,352
49	Mar 25, 2025 19:25	2,150,460	1,276,243,211	1,243,270,000	3,997,000	2,506,752
50	Mar 25, 2025 19:21	2,162,238	1,278,547,050	1,251,101,000	2,997,000	2,367,488
51	Mar 25, 2025 19:25	2,170,547	1,289,802,297	1,256,918,000	1,999,000	2,375,680
52	Mar 25, 2025 19:25	2,173,897	1,287,709,749	1,257,863,000	2,997,000	2,375,680
53	Mar 25, 2025 19:21	2,175,288	1,290,605,239	1,259,668,000	1,999,000	2,375,680
54	Mar 25, 2025 19:25	2,270,781	1,339,062,971	1,315,055,000	1,998,000	2,371,584

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