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 18:14

Josu San Martin

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Challenge History

Date	Challenger	Cost	Type	Status
Sep 15, 2026 12:35	Andrew Epstein	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Sep 15, 2026 12:47	0	10,730,710	770,000	0	20,480	No answer to stdout. Died or killed?
2	Dec 21, 2025 18:14	34,814	41,817,574	19,183,000	1,009,000	2,510,848
3	Dec 21, 2025 18:14	35,316	39,214,724	19,459,000	1,024,000	2,502,656
4	Dec 21, 2025 18:15	35,590	40,191,935	19,610,000	1,032,000	2,473,984
5	Dec 21, 2025 18:51	35,633	46,665,111	20,667,000	0	2,510,848
6	Dec 21, 2025 18:14	35,966	47,831,744	19,867,000	993,000	2,490,368
7	Dec 21, 2025 16:12	36,021	45,101,475	19,898,000	994,000	2,322,432
8	Dec 21, 2025 16:12	36,029	53,773,159	19,902,000	995,000	2,457,600
9	Dec 21, 2025 18:16	36,069	45,305,061	18,928,000	1,992,000	2,494,464
10	Dec 21, 2025 18:14	36,195	50,191,620	18,994,000	1,999,000	2,371,584
11	Dec 21, 2025 18:14	36,236	49,748,148	19,016,000	2,001,000	2,502,656
12	Dec 21, 2025 18:14	36,329	43,755,153	19,065,000	2,006,000	2,408,448
13	Dec 21, 2025 18:14	36,374	43,063,123	20,093,000	1,004,000	2,506,752
14	Dec 21, 2025 18:15	36,641	45,614,479	20,240,000	1,012,000	2,416,640
15	Dec 21, 2025 18:14	36,650	41,512,477	20,245,000	1,012,000	2,502,656
16	Dec 21, 2025 18:15	36,745	48,595,069	20,298,000	1,014,000	2,506,752
17	Dec 21, 2025 18:14	36,848	46,435,415	21,372,000	0	2,310,144
18	Dec 21, 2025 18:14	36,905	49,374,553	19,367,000	2,038,000	2,265,088
19	Dec 21, 2025 18:51	36,910	39,358,211	20,389,000	1,019,000	2,453,504
20	Dec 21, 2025 18:15	36,974	42,312,695	20,424,000	1,021,000	2,461,696
21	Dec 21, 2025 18:16	36,988	44,035,115	21,453,000	0	2,465,792
22	Dec 21, 2025 18:14	37,022	41,596,072	20,451,000	1,022,000	2,416,640
23	Dec 21, 2025 18:15	37,053	48,478,960	20,468,000	1,023,000	2,490,368
24	Dec 21, 2025 18:14	37,084	46,058,927	20,485,000	1,024,000	2,445,312
25	Dec 21, 2025 18:14	37,178	49,449,982	21,563,000	0	2,281,472
26	Dec 21, 2025 18:14	37,179	43,396,683	21,564,000	0	2,506,752
27	Dec 21, 2025 18:14	37,183	42,904,236	21,566,000	0	2,420,736
28	Dec 21, 2025 18:14	37,212	46,893,110	20,556,000	1,027,000	2,510,848
29	Dec 21, 2025 18:14	37,240	44,898,207	20,571,000	1,028,000	2,318,336
30	Dec 21, 2025 18:14	37,245	45,064,029	21,602,000	0	2,433,024
31	Dec 21, 2025 18:14	37,367	48,733,395	20,641,000	1,032,000	2,387,968
32	Dec 21, 2025 18:51	37,441	49,382,984	19,742,000	1,974,000	2,322,432
33	Dec 21, 2025 18:16	37,457	48,239,545	21,725,000	0	2,297,856
34	Dec 21, 2025 18:14	37,736	48,415,820	21,887,000	0	2,404,352
35	Dec 21, 2025 16:12	37,748	49,744,283	19,904,000	1,990,000	2,318,336
36	Dec 21, 2025 18:15	37,802	52,521,009	20,929,000	996,000	2,457,600
37	Dec 21, 2025 18:14	38,016	41,443,444	20,045,000	2,004,000	2,420,736

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