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 00:11

Josu San Martin

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Challenge History

Date	Challenger	Cost	Type	Status
Sep 15, 2026 21:10	Andrew Epstein	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Sep 15, 2026 21:15	0	10,913,268	779,000	0	20,480	No answer to stdout. Died or killed?
2	Dec 21, 2025 01:40	35,021	36,267,220	19,297,000	1,015,000	2,293,760
3	Dec 21, 2025 00:10	35,295	35,563,354	19,448,000	1,023,000	2,306,048
4	Dec 21, 2025 00:10	35,379	43,759,369	19,494,000	1,026,000	2,338,816
5	Dec 21, 2025 00:10	35,628	51,435,008	19,631,000	1,033,000	2,342,912
6	Dec 21, 2025 01:40	35,671	49,789,928	20,689,000	0	2,301,952
7	Dec 21, 2025 00:11	35,786	45,412,093	19,719,000	1,037,000	2,326,528
8	Dec 21, 2025 00:11	36,031	48,225,738	18,908,000	1,990,000	2,347,008
9	Dec 21, 2025 01:40	36,040	52,512,662	19,908,000	995,000	2,494,464
10	Dec 21, 2025 00:09	36,093	41,268,390	19,938,000	996,000	2,342,912
11	Dec 21, 2025 00:11	36,188	49,365,333	19,990,000	999,000	2,322,432
12	Dec 21, 2025 00:09	36,288	44,675,701	20,045,000	1,002,000	2,441,216
13	Dec 21, 2025 00:10	36,305	47,674,211	19,052,000	2,005,000	2,301,952
14	Dec 21, 2025 00:10	36,326	43,851,902	19,063,000	2,006,000	2,285,568
15	Dec 21, 2025 01:40	36,388	38,040,571	19,095,000	2,010,000	2,490,368
16	Dec 21, 2025 00:12	36,393	39,208,146	20,103,000	1,005,000	2,441,216
17	Dec 21, 2025 01:40	36,416	43,221,401	19,110,000	2,011,000	2,289,664
18	Dec 21, 2025 00:09	36,533	44,568,333	19,171,000	2,018,000	2,457,600
19	Dec 21, 2025 00:11	36,745	44,593,774	20,298,000	1,014,000	2,314,240
20	Dec 21, 2025 00:09	36,798	41,614,531	19,311,000	2,032,000	2,297,856
21	Dec 21, 2025 00:12	36,810	48,015,732	20,334,000	1,016,000	2,506,752
22	Dec 21, 2025 00:09	36,986	47,704,192	20,431,000	1,021,000	2,510,848
23	Dec 21, 2025 00:11	37,124	43,735,569	19,575,000	1,957,000	2,289,664
24	Dec 21, 2025 00:11	37,129	43,082,057	21,535,000	0	2,330,624
25	Dec 21, 2025 00:09	37,141	42,010,603	20,517,000	1,025,000	2,506,752
26	Dec 21, 2025 00:11	37,171	46,489,292	19,506,000	2,053,000	2,506,752
27	Dec 21, 2025 00:12	37,222	46,633,957	21,589,000	0	2,482,176
28	Dec 21, 2025 00:10	37,355	53,943,038	21,666,000	0	2,457,600
29	Dec 21, 2025 00:10	37,393	48,222,084	20,656,000	1,032,000	2,351,104
30	Dec 21, 2025 00:10	37,460	47,739,893	21,727,000	0	2,269,184
31	Dec 21, 2025 00:11	37,486	46,460,679	20,707,000	1,035,000	2,322,432
32	Dec 21, 2025 00:09	37,507	45,841,675	20,719,000	1,035,000	2,408,448
33	Dec 21, 2025 01:40	37,552	40,263,111	20,743,000	1,037,000	2,318,336
34	Dec 21, 2025 01:40	37,584	56,238,767	20,761,000	1,038,000	2,285,568
35	Dec 21, 2025 00:11	37,724	50,342,733	19,891,000	1,989,000	2,408,448
36	Dec 21, 2025 00:09	37,766	49,700,800	20,909,000	995,000	2,310,144
37	Dec 21, 2025 00:11	37,783	51,911,089	19,922,000	1,992,000	2,273,280
38	Dec 21, 2025 00:10	37,805	49,739,323	19,934,000	1,993,000	2,478,080
39	Dec 21, 2025 00:11	37,814	50,581,545	20,936,000	996,000	2,412,544
40	Dec 21, 2025 01:40	37,826	45,385,145	20,942,000	997,000	2,506,752
41	Dec 21, 2025 00:09	37,857	49,948,199	20,959,000	998,000	2,273,280
42	Dec 21, 2025 01:40	37,947	47,681,646	20,009,000	2,000,000	2,371,584
43	Dec 21, 2025 00:11	38,036	47,944,501	21,059,000	1,002,000	2,404,352

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