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 20:43	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 20:43	0	2,779,640,242	2,764,206,000	0	16,384	No answer to stdout. Died or killed?
2	Dec 26, 2025 11:13	27,976	33,967,344	15,212,000	1,014,000	2,347,008
3	Dec 26, 2025 11:12	28,181	33,442,012	16,345,000	0	2,342,912
4	Dec 26, 2025 12:07	28,205	32,938,237	16,359,000	0	2,351,104
5	Dec 26, 2025 12:07	28,472	41,294,887	16,514,000	0	2,338,816
6	Dec 26, 2025 11:37	29,150	43,972,411	16,907,000	0	2,510,848
7	Dec 26, 2025 11:02	29,155	44,531,252	14,921,000	1,989,000	2,289,664
8	Dec 26, 2025 11:13	29,160	47,843,407	15,919,000	994,000	2,342,912
9	Dec 26, 2025 11:21	29,164	45,707,207	15,920,000	995,000	2,334,720
10	Dec 26, 2025 11:13	29,390	36,369,588	16,044,000	1,002,000	2,506,752
11	Dec 26, 2025 11:12	29,414	32,675,801	16,057,000	1,003,000	2,494,464
12	Dec 26, 2025 11:13	29,440	38,323,148	16,071,000	1,004,000	2,498,560
13	Dec 26, 2025 11:37	29,459	34,000,997	16,081,000	1,005,000	2,486,272
14	Dec 26, 2025 11:12	29,559	41,481,162	15,127,000	2,017,000	2,318,336
15	Dec 26, 2025 11:02	29,598	38,251,817	16,158,000	1,009,000	2,306,048
16	Dec 26, 2025 11:02	29,824	42,337,354	15,263,000	2,035,000	2,306,048
17	Dec 26, 2025 11:02	29,828	40,218,621	16,283,000	1,017,000	2,494,464
18	Dec 26, 2025 11:21	29,869	42,155,801	17,324,000	0	2,523,136
19	Dec 26, 2025 11:13	29,919	40,524,723	16,333,000	1,020,000	2,473,984
20	Dec 26, 2025 11:02	29,991	48,151,172	17,395,000	0	2,510,848
21	Dec 26, 2025 11:02	29,995	30,087,950	17,397,000	0	2,498,560
22	Dec 26, 2025 11:21	30,024	49,659,630	17,414,000	0	2,486,272
23	Dec 26, 2025 12:07	30,043	34,331,834	17,425,000	0	2,326,528
24	Dec 26, 2025 11:02	30,052	38,407,255	16,405,000	1,025,000	2,281,472
25	Dec 26, 2025 12:07	30,114	35,981,632	17,466,000	0	2,285,568
26	Dec 26, 2025 11:37	30,133	48,863,158	17,477,000	0	2,289,664
27	Dec 26, 2025 11:13	30,143	38,218,113	16,455,000	1,028,000	2,281,472
28	Dec 26, 2025 11:13	30,221	38,250,641	16,497,000	1,031,000	2,449,408
29	Dec 26, 2025 12:07	30,222	46,339,868	16,498,000	1,031,000	2,281,472
30	Dec 26, 2025 12:07	30,228	36,777,375	17,532,000	0	2,461,696
31	Dec 26, 2025 12:07	30,234	36,260,484	16,505,000	1,031,000	2,457,600
32	Dec 26, 2025 11:13	30,255	43,089,224	16,516,000	1,032,000	2,486,272
33	Dec 26, 2025 11:02	30,307	37,059,634	16,544,000	1,034,000	2,531,328
34	Dec 26, 2025 12:07	30,441	44,491,835	17,656,000	0	2,420,736
35	Dec 26, 2025 11:13	30,495	42,133,708	17,687,000	0	2,506,752
36	Dec 26, 2025 12:07	30,578	44,180,126	16,692,000	1,043,000	2,424,832
37	Dec 26, 2025 11:02	30,948	43,909,336	17,950,000	0	2,383,872

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