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 27, 2024 15:25

E Sequeira

Score: 77,069

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 27, 2024 15:26	75,786	72,585,071	41,958,000	1,998,000	2,510,848
2	Mar 27, 2024 15:26	75,979	76,138,005	42,065,000	2,003,000	2,285,568
3	Mar 27, 2024 15:26	76,043	69,911,876	43,103,000	1,002,000	2,285,568
4	Mar 27, 2024 15:26	76,107	71,176,588	42,136,000	2,006,000	2,285,568
5	Mar 27, 2024 15:25	76,250	72,317,829	42,215,000	2,010,000	2,285,568
6	Mar 27, 2024 15:26	76,300	72,031,755	42,243,000	2,011,000	2,285,568
7	Mar 27, 2024 15:49	76,403	76,372,198	43,307,000	1,007,000	2,285,568
8	Mar 27, 2024 15:25	76,471	73,160,796	43,345,000	1,008,000	2,285,568
9	Mar 27, 2024 15:49	76,522	69,935,564	44,383,000	0	2,285,568
10	Mar 27, 2024 15:25	76,533	68,421,619	43,381,000	1,008,000	2,510,848
11	Mar 27, 2024 15:26	76,709	70,731,751	43,480,000	1,011,000	2,285,568
12	Mar 27, 2024 15:49	76,716	71,149,002	43,484,000	1,011,000	2,285,568
13	Mar 27, 2024 15:25	76,760	73,076,819	43,510,000	1,011,000	2,285,568
14	Mar 27, 2024 15:49	76,802	67,594,840	43,533,000	1,012,000	2,519,040
15	Mar 27, 2024 15:25	76,916	67,608,064	43,598,000	1,013,000	2,269,184
16	Mar 27, 2024 15:49	76,955	69,416,262	43,620,000	1,014,000	2,506,752
17	Mar 27, 2024 15:49	77,017	74,931,530	43,655,000	1,015,000	2,519,040
18	Mar 27, 2024 15:25	77,050	72,466,072	43,674,000	1,015,000	2,355,200
19	Mar 27, 2024 15:26	77,069	70,443,251	44,700,000	0	2,519,040
20	Mar 27, 2024 15:25	77,119	75,006,411	43,713,000	1,016,000	2,519,040
21	Mar 27, 2024 15:49	77,398	77,362,069	42,896,000	1,995,000	2,285,568
22	Mar 27, 2024 15:25	77,407	74,196,874	43,899,000	997,000	2,269,184
23	Mar 27, 2024 15:49	77,462	74,092,684	42,932,000	1,996,000	2,260,992
24	Mar 27, 2024 15:49	77,524	70,080,836	42,966,000	1,998,000	2,519,040
25	Mar 27, 2024 15:26	77,612	69,595,434	43,015,000	2,000,000	2,260,992
26	Mar 27, 2024 15:25	77,764	71,768,657	43,099,000	2,004,000	2,519,040
27	Mar 27, 2024 15:26	77,802	65,133,641	43,120,000	2,005,000	2,281,472
28	Mar 27, 2024 15:25	79,395	108,209,405	46,049,177	0	2,228,224
29	Mar 27, 2024 15:26	79,729	101,193,372	46,242,624	0	2,224,128
30	Mar 27, 2024 15:26	80,220	116,587,351	46,527,830	0	2,236,416
31	Mar 27, 2024 15:49	80,579	113,806,105	46,735,598	0	2,228,224
32	Mar 27, 2024 15:49	80,668	108,339,759	46,787,214	0	2,236,416
33	Mar 27, 2024 15:25	81,497	118,080,957	47,268,152	0	2,232,320
34	Mar 27, 2024 15:49	81,566	112,794,967	47,308,430	0	2,228,224
35	Mar 27, 2024 15:26	81,608	111,812,533	47,332,615	0	2,236,416
36	Mar 27, 2024 15:25	81,828	111,960,929	47,460,040	0	2,228,224

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