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 listSep 27, 2025 18:42

Wookyung JeongScore: 62,981Success

Source Code

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

Challenge History

No challenges yet.

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Sep 27, 2025 18:42	59,502	57,076,255	27,406,000	7,105,000	2,285,568
2	Sep 27, 2025 18:50	59,634	60,303,635	26,450,000	8,138,000	2,277,376
3	Sep 27, 2025 18:44	59,869	64,191,638	29,618,000	5,106,000	2,355,200
4	Sep 27, 2025 18:44	60,107	59,849,145	28,886,000	5,976,000	2,392,064
5	Sep 27, 2025 18:44	60,293	56,931,891	27,976,000	6,994,000	2,359,296
6	Sep 27, 2025 18:44	60,402	61,545,415	27,026,000	8,007,000	2,347,008
7	Sep 27, 2025 18:50	60,472	61,634,581	31,066,000	4,008,000	2,494,464
8	Sep 27, 2025 18:50	60,990	56,918,164	26,278,000	9,096,000	2,498,560
9	Sep 27, 2025 18:42	61,081	59,052,214	28,342,000	7,085,000	2,420,736
10	Sep 27, 2025 18:44	61,124	55,580,706	29,375,000	6,077,000	2,510,848
11	Sep 27, 2025 18:42	61,229	56,407,824	32,469,000	3,044,000	2,314,240
12	Sep 27, 2025 18:42	61,255	58,017,974	29,438,000	6,090,000	2,342,912
13	Sep 27, 2025 18:50	61,560	61,479,930	32,645,000	3,060,000	2,498,560
14	Sep 27, 2025 18:42	61,571	60,512,629	33,671,000	2,040,000	2,383,872
15	Sep 27, 2025 18:50	61,650	60,445,863	27,584,000	8,173,000	2,306,048
16	Sep 27, 2025 18:43	61,779	63,177,149	32,846,000	2,986,000	2,449,408
17	Sep 27, 2025 18:45	61,878	61,355,101	27,914,000	7,975,000	2,355,200
18	Sep 27, 2025 18:44	62,021	64,079,726	30,976,000	4,996,000	2,363,392
19	Sep 27, 2025 18:50	62,040	59,632,362	25,988,000	9,995,000	2,347,008
20	Sep 27, 2025 18:43	62,181	57,367,733	31,056,000	5,009,000	2,355,200
21	Sep 27, 2025 18:44	62,222	63,636,477	27,067,000	9,022,000	2,371,584
22	Sep 27, 2025 18:43	62,255	62,849,243	30,090,000	6,018,000	2,453,504
23	Sep 27, 2025 18:49	62,407	62,392,856	30,164,000	6,032,000	2,445,312
24	Sep 27, 2025 18:41	62,410	57,866,264	31,171,000	5,027,000	2,420,736
25	Sep 27, 2025 18:42	62,547	59,512,560	28,216,000	8,061,000	2,412,544
26	Sep 27, 2025 18:45	62,560	57,069,536	31,246,000	5,039,000	2,273,280
27	Sep 27, 2025 18:49	62,571	66,073,864	30,243,000	6,048,000	2,453,504
28	Sep 27, 2025 18:44	62,641	58,925,930	31,286,000	5,046,000	2,277,376
29	Sep 27, 2025 18:41	62,798	60,861,279	31,365,000	5,058,000	2,465,792
30	Sep 27, 2025 18:42	62,864	68,528,321	32,410,000	4,051,000	2,387,968
31	Sep 27, 2025 18:44	62,981	62,861,562	30,441,000	6,088,000	2,392,064
32	Sep 27, 2025 18:41	62,997	61,398,751	30,449,000	6,089,000	2,310,144
33	Sep 27, 2025 18:43	63,086	65,725,967	26,426,000	10,164,000	2,318,336
34	Sep 27, 2025 18:45	63,179	65,066,731	30,537,000	6,107,000	2,293,760
35	Sep 27, 2025 18:42	63,381	62,787,201	32,677,000	4,084,000	2,461,696
36	Sep 27, 2025 18:44	63,471	60,738,034	28,854,000	7,959,000	2,433,024
37	Sep 27, 2025 18:44	63,481	62,116,666	30,849,000	5,970,000	2,285,568
38	Sep 27, 2025 18:42	63,529	71,725,207	32,864,000	3,983,000	2,310,144
39	Sep 27, 2025 18:44	63,571	61,709,524	34,878,000	1,993,000	2,322,432
40	Sep 27, 2025 18:44	63,578	64,020,801	28,902,000	7,973,000	2,359,296
41	Sep 27, 2025 18:44	63,602	64,460,894	30,907,000	5,982,000	2,502,656
42	Sep 27, 2025 18:49	63,693	64,046,643	30,952,000	5,990,000	2,404,352
43	Sep 27, 2025 18:43	63,786	63,714,540	27,997,000	8,999,000	2,351,104
44	Sep 27, 2025 18:42	63,800	60,106,209	31,004,000	6,000,000	2,461,696
45	Sep 27, 2025 18:42	63,848	62,002,230	32,028,000	5,004,000	2,347,008
46	Sep 27, 2025 18:50	63,866	59,439,667	31,036,000	6,006,000	2,338,816
47	Sep 27, 2025 18:42	64,016	57,002,679	34,119,000	3,010,000	2,297,856
48	Sep 27, 2025 18:44	64,040	60,427,817	32,124,000	5,019,000	2,277,376
49	Sep 27, 2025 18:44	64,241	64,967,446	33,232,000	4,028,000	2,338,816
50	Sep 27, 2025 18:44	64,481	70,423,953	31,335,000	6,064,000	2,330,624
51	Sep 27, 2025 18:44	64,500	63,053,045	32,355,000	5,055,000	2,510,848
52	Sep 27, 2025 18:44	64,584	58,752,507	33,410,000	4,049,000	2,310,144
53	Sep 27, 2025 18:44	64,778	60,142,522	31,479,000	6,092,000	2,519,040
54	Sep 27, 2025 18:44	64,845	64,197,743	32,528,000	5,082,000	2,297,856
55	Sep 27, 2025 18:42	65,128	64,809,153	30,816,000	6,958,000	2,490,368
56	Sep 27, 2025 18:43	65,179	65,293,704	27,856,000	9,948,000	2,293,760
57	Sep 27, 2025 18:42	65,303	63,321,810	30,899,000	6,977,000	2,404,352
58	Sep 27, 2025 18:50	65,326	70,926,101	29,913,000	7,976,000	2,424,832
59	Sep 27, 2025 18:42	65,931	61,056,171	30,190,000	8,050,000	2,482,176
60	Sep 27, 2025 18:50	66,307	60,010,914	31,374,000	7,084,000	2,486,272

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