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 listMar 26, 2024 17:16

E Sequeira

Score: 82,867

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 26, 2024 17:16	82,181	70,751,638	45,679,000	1,986,000	2,285,568
2	Mar 26, 2024 17:16	82,228	74,288,217	46,678,000	1,014,000	2,506,752
3	Mar 26, 2024 17:18	82,292	116,139,648	47,729,579	0	2,211,840
4	Mar 26, 2024 17:18	82,305	72,727,507	47,737,000	0	2,285,568
5	Mar 26, 2024 17:18	82,329	74,075,142	47,751,000	0	2,510,848
6	Mar 26, 2024 17:35	82,525	109,013,048	47,864,754	0	2,215,936
7	Mar 26, 2024 17:18	82,547	73,279,716	46,880,000	997,000	2,285,568
8	Mar 26, 2024 17:35	82,560	77,515,135	45,890,000	1,995,000	2,519,040
9	Mar 26, 2024 17:35	82,619	70,540,742	45,923,000	1,996,000	2,285,568
10	Mar 26, 2024 17:35	82,667	69,340,220	45,950,000	1,997,000	2,510,848
11	Mar 26, 2024 17:35	82,690	76,978,434	45,962,000	1,998,000	2,285,568
12	Mar 26, 2024 17:35	82,702	75,643,542	45,969,000	1,998,000	2,260,992
13	Mar 26, 2024 17:35	82,735	120,559,693	47,986,433	0	2,207,744
14	Mar 26, 2024 17:16	82,745	70,384,913	45,993,000	1,999,000	2,506,752
15	Mar 26, 2024 17:35	82,747	71,443,874	46,994,000	999,000	2,285,568
16	Mar 26, 2024 17:16	82,760	106,386,603	48,000,806	0	2,203,648
17	Mar 26, 2024 17:16	82,789	99,953,122	48,017,887	0	2,207,744
18	Mar 26, 2024 17:16	82,800	75,460,593	47,024,000	1,000,000	2,506,752
19	Mar 26, 2024 17:35	82,867	124,152,047	48,062,774	0	2,220,032
20	Mar 26, 2024 17:18	82,869	74,801,729	46,062,000	2,002,000	2,285,568
21	Mar 26, 2024 17:35	82,876	71,773,318	46,066,000	2,002,000	2,285,568
22	Mar 26, 2024 17:16	82,879	104,907,482	48,069,809	0	2,211,840
23	Mar 26, 2024 17:16	82,888	75,138,987	46,072,000	2,003,000	2,285,568
24	Mar 26, 2024 17:35	82,919	77,577,671	46,090,000	2,003,000	2,285,568
25	Mar 26, 2024 17:16	82,952	77,143,272	46,108,000	2,004,000	2,510,848
26	Mar 26, 2024 17:18	83,014	70,474,792	46,142,000	2,006,000	2,285,568
27	Mar 26, 2024 17:18	83,116	109,062,308	48,207,159	0	2,211,840
28	Mar 26, 2024 17:35	83,150	73,110,060	46,218,000	2,009,000	2,285,568
29	Mar 26, 2024 17:18	83,218	106,365,351	48,266,620	0	2,211,840
30	Mar 26, 2024 17:18	83,372	74,803,444	47,349,000	1,007,000	2,273,280
31	Mar 26, 2024 17:18	83,569	76,135,194	48,470,000	0	2,285,568
32	Mar 26, 2024 17:18	83,814	74,226,625	47,600,000	1,012,000	2,285,568
33	Mar 26, 2024 17:16	83,836	69,220,201	47,612,000	1,013,000	2,506,752
34	Mar 26, 2024 17:16	83,836	76,360,946	47,612,000	1,013,000	2,269,184
35	Mar 26, 2024 17:16	84,222	77,029,964	48,849,000	0	2,506,752
36	Mar 26, 2024 17:18	84,291	76,908,342	46,894,000	1,995,000	2,285,568

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