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	1:20.1.2-0ubuntu1~24.04.2	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.
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	3.0.13-0ubuntu3.9	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 listSep 27, 2025 14:36

Wookyung JeongScore: 86,928Success

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Sep 27, 2025 14:36	78,091	72,135,841	40,261,000	5,032,000	2,293,760
2	Sep 27, 2025 14:35	79,222	73,973,730	38,957,000	6,992,000	2,519,040
3	Sep 27, 2025 14:36	79,743	68,726,633	36,197,000	10,054,000	2,260,992
4	Sep 27, 2025 14:36	80,391	74,325,667	40,546,000	6,081,000	2,437,120
5	Sep 27, 2025 14:35	80,429	77,195,404	40,565,000	6,084,000	2,379,776
6	Sep 27, 2025 14:34	81,603	73,569,686	43,302,000	4,028,000	2,465,792
7	Sep 27, 2025 14:36	81,674	74,242,974	42,332,000	5,039,000	2,523,136
8	Sep 27, 2025 14:36	81,845	72,652,002	40,400,000	7,070,000	2,371,584
9	Sep 27, 2025 14:34	82,766	69,777,882	43,004,000	5,000,000	2,269,184
10	Sep 27, 2025 14:36	84,786	72,063,858	41,148,000	8,028,000	2,269,184
11	Sep 27, 2025 14:36	84,791	68,921,885	42,154,000	7,025,000	2,269,184
12	Sep 27, 2025 14:36	84,802	70,765,075	41,155,000	8,030,000	2,383,872
13	Sep 27, 2025 14:34	84,990	76,346,490	46,276,000	3,018,000	2,457,600
14	Sep 27, 2025 14:35	86,024	79,294,864	41,911,000	7,983,000	2,482,176
15	Sep 27, 2025 14:35	86,741	74,861,715	43,267,000	7,043,000	2,519,040
16	Sep 27, 2025 14:34	86,840	73,339,071	42,309,000	8,058,000	2,441,216
17	Sep 27, 2025 14:34	86,897	79,750,851	42,336,000	8,064,000	2,437,120
18	Sep 27, 2025 14:36	86,898	76,545,585	40,321,000	10,080,000	2,506,752
19	Sep 27, 2025 14:36	86,928	76,334,647	45,377,000	5,041,000	2,424,832
20	Sep 27, 2025 14:35	87,648	76,933,060	42,862,000	7,974,000	2,510,848
21	Sep 27, 2025 14:35	87,893	74,352,154	42,982,000	7,996,000	2,383,872
22	Sep 27, 2025 14:35	88,600	77,617,403	41,312,000	10,076,000	2,260,992
23	Sep 27, 2025 14:36	88,619	73,458,168	44,345,000	7,054,000	2,469,888
24	Sep 27, 2025 14:34	88,993	82,547,621	44,532,000	7,084,000	2,519,040
25	Sep 27, 2025 14:36	89,422	74,708,851	46,781,000	5,084,000	2,363,392
26	Sep 27, 2025 14:34	89,662	75,736,811	46,004,000	6,000,000	2,428,928
27	Sep 27, 2025 14:35	89,697	75,434,063	46,022,000	6,002,000	2,269,184
28	Sep 27, 2025 14:36	89,724	74,842,005	46,036,000	6,004,000	2,396,160
29	Sep 27, 2025 14:36	90,066	75,788,963	45,206,000	7,032,000	2,523,136
30	Sep 27, 2025 14:35	90,076	78,530,303	46,216,000	6,028,000	2,449,408
31	Sep 27, 2025 14:34	90,445	77,553,621	45,397,000	7,061,000	2,519,040
32	Sep 27, 2025 14:34	90,447	79,765,831	47,415,000	5,044,000	2,260,992
33	Sep 27, 2025 14:36	91,167	81,504,321	43,898,000	8,979,000	2,519,040
34	Sep 27, 2025 14:36	91,529	80,103,409	45,074,000	8,013,000	2,269,184
35	Sep 27, 2025 14:36	92,184	75,970,244	46,406,000	7,061,000	2,265,088
36	Sep 27, 2025 14:36	93,898	80,603,323	47,402,000	7,059,000	2,269,184

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