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.

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Wookyung JeongScore: 55,078Success

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Sep 29, 2025 20:13	51,553	54,462,114	28,905,000	996,000	2,519,040
2	Sep 29, 2025 20:14	51,707	52,551,425	27,991,000	1,999,000	2,297,856
3	Sep 29, 2025 20:14	52,526	56,100,510	27,419,000	3,046,000	2,523,136
4	Sep 29, 2025 20:12	52,709	57,084,353	26,495,000	4,076,000	2,486,272
5	Sep 29, 2025 20:13	52,979	56,887,991	30,728,000	0	2,285,568
6	Sep 29, 2025 20:12	53,034	56,647,245	28,710,000	2,050,000	2,355,200
7	Sep 29, 2025 20:12	53,226	60,937,288	27,884,000	2,987,000	2,306,048
8	Sep 29, 2025 20:13	53,257	60,265,715	27,900,000	2,989,000	2,363,392
9	Sep 29, 2025 20:15	53,271	60,094,362	26,911,000	3,986,000	2,498,560
10	Sep 29, 2025 20:14	53,576	56,198,919	28,067,000	3,007,000	2,445,312
11	Sep 29, 2025 20:13	53,655	56,634,798	28,109,000	3,011,000	2,392,064
12	Sep 29, 2025 20:14	53,709	55,602,917	27,132,000	4,019,000	2,437,120
13	Sep 29, 2025 20:12	53,809	58,943,438	27,182,000	4,027,000	2,383,872
14	Sep 29, 2025 20:14	53,957	54,811,590	29,276,000	2,019,000	2,379,776
15	Sep 29, 2025 20:12	54,016	51,280,942	28,298,000	3,031,000	2,433,024
16	Sep 29, 2025 20:12	54,186	53,258,043	27,373,000	4,055,000	2,367,488
17	Sep 29, 2025 20:12	54,200	56,336,417	27,380,000	4,056,000	2,318,336
18	Sep 29, 2025 20:14	54,245	58,281,204	28,418,000	3,044,000	2,469,888
19	Sep 29, 2025 20:14	54,450	53,700,405	30,563,000	1,018,000	2,342,912
20	Sep 29, 2025 20:12	55,078	51,464,724	28,951,000	2,994,000	2,416,640
21	Sep 29, 2025 20:15	55,186	58,393,747	30,008,000	2,000,000	2,306,048
22	Sep 29, 2025 20:14	55,209	53,421,672	29,019,000	3,002,000	2,379,776
23	Sep 29, 2025 20:13	55,250	55,515,918	28,040,000	4,005,000	2,498,560
24	Sep 29, 2025 20:12	55,964	55,883,699	30,431,000	2,028,000	2,367,488
25	Sep 29, 2025 20:14	56,119	59,992,606	30,515,000	2,034,000	2,285,568
26	Sep 29, 2025 20:13	56,284	55,563,592	31,625,000	1,020,000	2,301,952
27	Sep 29, 2025 20:13	56,334	57,100,858	30,632,000	2,042,000	2,408,448
28	Sep 29, 2025 20:13	56,650	59,351,756	30,866,000	1,991,000	2,437,120
29	Sep 29, 2025 20:13	56,671	58,265,472	30,877,000	1,992,000	2,322,432
30	Sep 29, 2025 20:14	56,672	60,560,929	29,882,000	2,988,000	2,314,240
31	Sep 29, 2025 20:13	56,681	57,673,861	29,887,000	2,988,000	2,265,088
32	Sep 29, 2025 20:13	56,686	58,460,624	30,886,000	1,992,000	2,371,584
33	Sep 29, 2025 20:14	56,722	63,782,690	29,909,000	2,990,000	2,490,368
34	Sep 29, 2025 20:15	56,729	62,478,058	28,915,000	3,988,000	2,330,624
35	Sep 29, 2025 20:13	57,045	62,188,356	30,079,000	3,007,000	2,428,928
36	Sep 29, 2025 20:13	57,460	59,457,296	31,308,000	2,019,000	2,387,968
37	Sep 29, 2025 20:13	57,736	57,813,720	30,443,000	3,044,000	2,355,200
38	Sep 29, 2025 20:14	58,169	57,770,179	30,762,000	2,976,000	2,486,272
39	Sep 29, 2025 20:13	59,100	57,149,078	31,254,000	3,024,000	2,486,272

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