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.

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Challenge History

Date	Challenger	Cost	Type	Status
Jul 5, 2026 20:57	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 20:57	0	2,759,478,246	2,750,303,000	1,000,000	16,384	No answer to stdout. Died or killed?
2	Dec 23, 2025 23:21	29,724	33,349,505	17,240,000	0	2,519,040
3	Dec 23, 2025 23:21	29,974	41,198,571	17,385,000	0	2,297,856
4	Dec 23, 2025 23:14	30,164	32,188,697	17,495,000	0	2,347,008
5	Dec 23, 2025 23:15	30,314	42,656,796	17,582,000	0	2,490,368
6	Dec 23, 2025 23:15	30,395	35,984,201	16,592,000	1,037,000	2,306,048
7	Dec 23, 2025 23:20	30,421	46,384,114	17,644,000	0	2,342,912
8	Dec 23, 2025 23:21	30,441	33,634,262	17,656,000	0	2,326,528
9	Dec 23, 2025 23:17	30,476	45,667,643	17,676,000	0	2,510,848
10	Dec 23, 2025 23:27	30,500	50,226,678	17,690,000	0	2,510,848
11	Dec 23, 2025 23:27	30,503	43,501,215	17,692,000	0	2,314,240
12	Dec 23, 2025 23:20	30,507	40,885,854	17,694,000	0	2,326,528
13	Dec 23, 2025 23:15	30,609	36,836,474	17,753,000	0	2,498,560
14	Dec 23, 2025 23:20	30,859	47,217,884	15,910,000	1,988,000	2,506,752
15	Dec 23, 2025 23:14	30,866	43,534,420	16,908,000	994,000	2,506,752
16	Dec 23, 2025 23:20	30,866	39,243,114	15,913,000	1,989,000	2,301,952
17	Dec 23, 2025 23:21	30,874	45,652,394	15,918,000	1,989,000	2,523,136
18	Dec 23, 2025 23:13	30,876	51,611,709	15,919,000	1,989,000	2,306,048
19	Dec 23, 2025 23:14	30,876	47,623,525	16,914,000	994,000	2,424,832
20	Dec 23, 2025 23:16	30,884	47,944,648	15,923,000	1,990,000	2,310,144
21	Dec 23, 2025 23:13	30,907	44,239,226	16,931,000	995,000	2,326,528
22	Dec 23, 2025 23:26	30,936	31,884,350	15,950,000	1,993,000	2,506,752
23	Dec 23, 2025 23:15	30,969	37,457,394	15,967,000	1,995,000	2,473,984
24	Dec 23, 2025 23:17	31,038	40,904,968	17,002,000	1,000,000	2,293,760
25	Dec 23, 2025 23:15	31,040	34,701,076	17,003,000	1,000,000	2,297,856
26	Dec 23, 2025 23:14	31,053	39,769,543	16,010,000	2,001,000	2,453,504
27	Dec 23, 2025 23:14	31,062	42,773,482	16,015,000	2,001,000	2,510,848
28	Dec 23, 2025 23:22	31,102	43,071,002	16,035,000	2,004,000	2,486,272
29	Dec 23, 2025 23:13	31,155	39,521,800	17,067,000	1,003,000	2,310,144
30	Dec 23, 2025 23:13	31,169	39,539,608	17,074,000	1,004,000	2,293,760
31	Dec 23, 2025 23:16	31,176	45,280,564	16,073,000	2,009,000	2,281,472
32	Dec 23, 2025 23:14	31,276	41,928,578	17,133,000	1,007,000	2,400,256
33	Dec 23, 2025 23:15	31,290	41,757,441	17,140,000	1,008,000	2,519,040
34	Dec 23, 2025 23:15	31,295	47,317,467	17,143,000	1,008,000	2,490,368
35	Dec 23, 2025 23:14	31,305	42,613,176	17,149,000	1,008,000	2,310,144
36	Dec 23, 2025 23:21	31,322	38,841,911	16,149,000	2,018,000	2,412,544
37	Dec 23, 2025 23:22	31,322	38,860,567	16,149,000	2,018,000	2,498,560
38	Dec 23, 2025 23:15	31,372	37,974,472	16,175,000	2,021,000	2,293,760
39	Dec 23, 2025 23:17	31,440	39,552,053	16,209,000	2,026,000	2,461,696
40	Dec 23, 2025 23:15	31,445	45,204,263	17,225,000	1,013,000	2,314,240
41	Dec 23, 2025 23:14	31,509	39,791,926	18,275,000	0	2,510,848
42	Dec 23, 2025 23:15	31,510	42,711,223	17,261,000	1,015,000	2,310,144
43	Dec 23, 2025 23:15	31,510	47,808,709	17,261,000	1,015,000	2,412,544
44	Dec 23, 2025 23:22	31,534	50,310,016	17,274,000	1,016,000	2,494,464
45	Dec 23, 2025 23:13	31,584	38,341,357	18,319,000	0	2,498,560
46	Dec 23, 2025 23:20	31,612	42,934,699	17,317,000	1,018,000	2,289,664
47	Dec 23, 2025 23:14	31,624	47,644,660	17,323,000	1,019,000	2,285,568
48	Dec 23, 2025 23:14	31,638	44,005,988	18,350,000	0	2,273,280
49	Dec 23, 2025 23:27	31,686	42,561,696	17,357,000	1,021,000	2,490,368
50	Dec 23, 2025 23:20	31,691	32,687,976	18,381,000	0	2,510,848
51	Dec 23, 2025 23:16	31,759	46,024,334	17,397,000	1,023,000	2,465,792
52	Dec 23, 2025 23:20	31,778	40,894,110	18,431,000	0	2,482,176
53	Dec 23, 2025 23:20	31,783	45,239,676	18,434,000	0	2,498,560
54	Dec 23, 2025 23:14	31,819	40,424,358	17,430,000	1,025,000	2,351,104
55	Dec 23, 2025 23:16	31,841	38,300,200	17,442,000	1,026,000	2,465,792
56	Dec 23, 2025 23:14	31,847	37,995,747	18,471,000	0	2,457,600
57	Dec 23, 2025 23:13	31,872	38,335,597	18,486,000	0	2,449,408
58	Dec 23, 2025 23:21	31,879	39,663,361	18,490,000	0	2,285,568
59	Dec 23, 2025 23:14	31,881	38,733,439	18,491,000	0	2,465,792
60	Dec 23, 2025 23:21	31,891	35,708,004	17,470,000	1,027,000	2,355,200
61	Dec 23, 2025 23:16	31,900	39,303,838	18,502,000	0	2,519,040
62	Dec 23, 2025 23:16	31,902	48,728,223	18,503,000	0	2,322,432
63	Dec 23, 2025 23:26	31,921	34,789,891	17,486,000	1,028,000	2,527,232
64	Dec 23, 2025 23:14	31,938	39,758,772	16,466,000	2,058,000	2,527,232
65	Dec 23, 2025 23:15	31,984	40,658,580	17,521,000	1,030,000	2,535,424
66	Dec 23, 2025 23:20	32,012	39,148,195	17,536,000	1,031,000	2,498,560
67	Dec 23, 2025 23:26	32,021	35,113,249	18,572,000	0	2,318,336
68	Dec 23, 2025 23:15	32,100	44,241,486	17,584,000	1,034,000	2,510,848
69	Dec 23, 2025 23:15	32,262	46,889,495	17,673,000	1,039,000	2,441,216
70	Dec 23, 2025 23:15	32,278	31,645,324	18,721,000	0	2,494,464
71	Dec 23, 2025 23:21	32,586	44,933,299	16,911,000	1,989,000	2,437,120
72	Dec 23, 2025 23:21	32,617	46,592,100	16,927,000	1,991,000	2,441,216
73	Dec 23, 2025 23:14	32,636	41,044,344	16,937,000	1,992,000	2,502,656

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