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 21, 2025 04:56

Josu San Martin

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Challenge History

Date	Challenger	Cost	Type	Status
Sep 15, 2026 12:27	Andrew Epstein	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Sep 15, 2026 12:37	0	10,722,584	768,000	0	20,480	No answer to stdout. Died or killed?
2	Dec 21, 2025 04:51	34,686	43,950,771	19,113,000	1,005,000	2,281,472
3	Dec 21, 2025 05:01	34,984	42,304,812	19,277,000	1,014,000	2,445,312
4	Dec 21, 2025 04:51	35,045	49,725,162	20,326,000	0	2,273,280
5	Dec 21, 2025 04:55	35,062	46,843,326	19,320,000	1,016,000	2,465,792
6	Dec 21, 2025 05:02	35,088	42,409,879	19,334,000	1,017,000	2,486,272
7	Dec 21, 2025 04:51	35,407	42,287,110	19,510,000	1,026,000	2,437,120
8	Dec 21, 2025 05:01	35,510	47,326,764	19,567,000	1,029,000	2,486,272
9	Dec 21, 2025 05:04	35,647	50,562,462	19,642,000	1,033,000	2,437,120
10	Dec 21, 2025 05:09	35,666	50,202,229	19,652,000	1,034,000	2,461,696
11	Dec 21, 2025 05:02	36,021	50,957,257	19,898,000	994,000	2,465,792
12	Dec 21, 2025 05:04	36,029	50,806,786	19,902,000	995,000	2,387,968
13	Dec 21, 2025 05:04	36,033	47,425,474	19,904,000	995,000	2,330,624
14	Dec 21, 2025 05:03	36,034	52,014,786	19,905,000	995,000	2,469,888
15	Dec 21, 2025 05:07	36,038	46,422,219	20,902,000	0	2,387,968
16	Dec 21, 2025 05:02	36,043	53,838,330	19,910,000	995,000	2,449,408
17	Dec 21, 2025 04:51	36,045	48,445,473	18,915,000	1,991,000	2,326,528
18	Dec 21, 2025 05:04	36,053	48,619,481	18,920,000	1,991,000	2,449,408
19	Dec 21, 2025 05:09	36,093	51,692,907	18,941,000	1,993,000	2,437,120
20	Dec 21, 2025 04:55	36,188	46,389,526	19,990,000	999,000	2,469,888
21	Dec 21, 2025 05:03	36,209	44,052,009	19,001,000	2,000,000	2,400,256
22	Dec 21, 2025 05:02	36,224	41,123,404	19,009,000	2,001,000	2,355,200
23	Dec 21, 2025 05:04	36,247	50,793,862	19,021,000	2,002,000	2,416,640
24	Dec 21, 2025 05:04	36,338	50,727,634	20,073,000	1,003,000	2,428,928
25	Dec 21, 2025 05:09	36,359	41,689,865	20,084,000	1,004,000	2,445,312
26	Dec 21, 2025 05:04	36,372	45,126,129	19,087,000	2,009,000	2,396,160
27	Dec 21, 2025 05:03	36,452	44,186,638	20,136,000	1,006,000	2,359,296
28	Dec 21, 2025 05:01	36,476	43,618,771	20,149,000	1,007,000	2,453,504
29	Dec 21, 2025 05:02	36,512	43,380,825	19,161,000	2,016,000	2,334,720
30	Dec 21, 2025 05:02	36,543	47,083,875	19,177,000	2,018,000	2,473,984
31	Dec 21, 2025 05:04	36,545	49,700,961	20,187,000	1,009,000	2,375,680
32	Dec 21, 2025 05:06	36,697	47,167,968	18,244,000	3,040,000	2,318,336
33	Dec 21, 2025 05:02	36,767	45,529,995	20,310,000	1,015,000	2,523,136
34	Dec 21, 2025 05:04	36,836	41,453,890	20,348,000	1,017,000	2,371,584
35	Dec 21, 2025 04:51	36,838	43,839,238	20,349,000	1,017,000	2,461,696
36	Dec 21, 2025 04:51	36,855	51,783,034	20,359,000	1,017,000	2,506,752
37	Dec 21, 2025 05:01	36,867	43,930,324	21,383,000	0	2,281,472
38	Dec 21, 2025 05:04	36,883	48,849,624	21,392,000	0	2,285,568
39	Dec 21, 2025 05:03	36,888	43,875,668	20,377,000	1,018,000	2,445,312
40	Dec 21, 2025 05:03	36,907	45,238,790	21,406,000	0	2,273,280
41	Dec 21, 2025 05:03	36,921	51,896,259	20,395,000	1,019,000	2,379,776
42	Dec 21, 2025 05:07	36,947	46,100,835	20,409,000	1,020,000	2,441,216
43	Dec 21, 2025 04:51	36,993	48,230,884	21,456,000	0	2,478,080
44	Dec 21, 2025 04:51	37,007	40,221,920	20,442,000	1,022,000	2,437,120
45	Dec 21, 2025 05:02	37,014	46,227,385	21,468,000	0	2,457,600
46	Dec 21, 2025 05:01	37,019	45,478,154	21,471,000	0	2,387,968
47	Dec 21, 2025 05:02	37,059	51,283,999	21,494,000	0	2,400,256
48	Dec 21, 2025 05:06	37,083	42,820,818	19,460,000	2,048,000	2,367,488
49	Dec 21, 2025 04:55	37,191	40,110,970	20,544,000	1,027,000	2,404,352
50	Dec 21, 2025 05:06	37,217	43,617,994	20,559,000	1,027,000	2,416,640
51	Dec 21, 2025 04:51	37,229	45,642,182	21,593,000	0	2,379,776
52	Dec 21, 2025 05:02	37,259	43,902,942	20,581,000	1,029,000	2,478,080
53	Dec 21, 2025 04:56	37,288	41,590,092	21,627,000	0	2,510,848
54	Dec 21, 2025 04:51	37,329	48,843,814	20,620,000	1,031,000	2,371,584
55	Dec 21, 2025 05:02	37,359	49,223,917	20,637,000	1,031,000	2,510,848
56	Dec 21, 2025 05:02	37,426	51,286,970	21,707,000	0	2,404,352
57	Dec 21, 2025 04:51	37,429	50,712,199	20,676,000	1,033,000	2,347,008
58	Dec 21, 2025 05:01	37,483	43,955,613	20,705,000	1,035,000	2,506,752
59	Dec 21, 2025 04:56	37,622	47,877,095	20,830,000	991,000	2,510,848
60	Dec 21, 2025 04:51	37,755	53,349,909	20,903,000	995,000	2,404,352
61	Dec 21, 2025 05:07	37,772	54,490,113	19,917,000	1,991,000	2,441,216
62	Dec 21, 2025 04:56	37,783	55,695,450	20,918,000	996,000	2,490,368
63	Dec 21, 2025 05:04	37,822	42,444,216	20,940,000	997,000	2,273,280
64	Dec 21, 2025 05:04	38,326	49,650,072	20,209,000	2,020,000	2,437,120

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