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 20:49	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 20:49	0	2,757,073,200	2,749,147,000	0	16,384	No answer to stdout. Died or killed?
2	Dec 23, 2025 23:45	29,084	42,574,917	15,877,000	992,000	2,523,136
3	Dec 23, 2025 23:46	29,159	31,219,395	14,923,000	1,989,000	2,519,040
4	Dec 23, 2025 23:58	29,438	44,998,352	16,070,000	1,004,000	2,326,528
5	Dec 23, 2025 23:49	29,467	40,921,116	16,086,000	1,005,000	2,527,232
6	Dec 23, 2025 23:44	29,524	35,004,236	16,117,000	1,007,000	2,330,624
7	Dec 23, 2025 23:46	29,705	44,640,482	16,216,000	1,013,000	2,322,432
8	Dec 23, 2025 23:58	29,721	40,980,359	17,238,000	0	2,506,752
9	Dec 23, 2025 23:45	29,914	35,020,034	17,350,000	0	2,490,368
10	Dec 23, 2025 23:59	29,928	33,640,132	16,337,000	1,021,000	2,506,752
11	Dec 23, 2025 23:48	30,048	44,113,743	17,428,000	0	2,281,472
12	Dec 23, 2025 23:45	30,117	33,162,363	17,468,000	0	2,498,560
13	Dec 23, 2025 23:44	30,133	33,690,319	16,449,000	1,028,000	2,498,560
14	Dec 23, 2025 23:44	30,343	38,151,564	16,564,000	1,035,000	2,506,752
15	Dec 23, 2025 23:47	30,379	44,509,883	16,584,000	1,036,000	2,523,136
16	Dec 23, 2025 23:58	30,479	48,074,655	16,639,000	1,039,000	2,478,080
17	Dec 23, 2025 23:58	30,516	47,905,738	16,716,000	983,000	2,527,232
18	Dec 23, 2025 23:45	30,564	43,538,383	17,727,000	0	2,502,656
19	Dec 23, 2025 23:45	30,583	43,793,262	17,738,000	0	2,506,752
20	Dec 23, 2025 23:44	30,866	43,681,711	16,908,000	994,000	2,473,984
21	Dec 23, 2025 23:48	30,869	35,593,817	16,910,000	994,000	2,506,752
22	Dec 23, 2025 23:45	30,872	46,586,390	15,917,000	1,989,000	2,473,984
23	Dec 23, 2025 23:58	30,874	34,113,798	16,913,000	994,000	2,473,984
24	Dec 23, 2025 23:59	30,878	50,577,314	17,909,000	0	2,318,336
25	Dec 23, 2025 23:44	30,881	30,021,055	15,921,000	1,990,000	2,482,176
26	Dec 23, 2025 23:45	30,886	37,306,778	16,919,000	995,000	2,461,696
27	Dec 23, 2025 23:49	30,890	43,389,477	17,916,000	0	2,293,760
28	Dec 23, 2025 23:47	30,928	42,603,049	16,942,000	996,000	2,482,176
29	Dec 23, 2025 23:45	30,962	45,875,939	15,963,000	1,995,000	2,310,144
30	Dec 23, 2025 23:58	31,022	39,706,358	16,994,000	999,000	2,510,848
31	Dec 23, 2025 23:49	31,171	39,266,408	17,075,000	1,004,000	2,490,368
32	Dec 23, 2025 23:48	31,216	45,420,776	16,094,000	2,011,000	2,494,464
33	Dec 23, 2025 23:45	31,262	48,449,441	16,118,000	2,014,000	2,506,752
34	Dec 23, 2025 23:44	31,264	33,457,498	17,126,000	1,007,000	2,437,120
35	Dec 23, 2025 23:47	31,274	37,279,180	17,132,000	1,007,000	2,506,752
36	Dec 23, 2025 23:46	31,276	42,169,978	17,133,000	1,007,000	2,281,472
37	Dec 23, 2025 23:59	31,829	43,504,056	17,436,000	1,025,000	2,486,272

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