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 31, 2024 13:52

E Sequeira

Score: 76,997

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 31, 2024 14:10	75,734	71,946,913	41,930,000	1,996,000	2,510,848
2	Mar 31, 2024 13:56	75,771	65,415,973	41,950,000	1,997,000	2,510,848
3	Mar 31, 2024 13:56	75,798	64,205,691	41,965,000	1,998,000	2,367,488
4	Mar 31, 2024 13:52	75,826	71,293,122	41,980,000	1,999,000	2,269,184
5	Mar 31, 2024 14:10	75,853	72,681,236	41,996,000	1,999,000	2,519,040
6	Mar 31, 2024 14:10	76,002	78,895,357	43,080,000	1,001,000	2,510,848
7	Mar 31, 2024 13:56	76,102	69,579,396	42,133,000	2,006,000	2,285,568
8	Mar 31, 2024 14:10	76,153	70,130,202	42,162,000	2,007,000	2,519,040
9	Mar 31, 2024 13:56	76,184	65,378,259	42,179,000	2,008,000	2,285,568
10	Mar 31, 2024 13:52	76,210	65,509,643	42,193,000	2,009,000	2,265,088
11	Mar 31, 2024 13:52	76,343	65,439,399	42,267,000	2,012,000	2,506,752
12	Mar 31, 2024 14:10	76,343	67,755,488	42,267,000	2,012,000	2,387,968
13	Mar 31, 2024 13:52	76,348	65,936,755	43,276,000	1,006,000	2,269,184
14	Mar 31, 2024 13:52	76,429	72,128,248	43,322,000	1,007,000	2,510,848
15	Mar 31, 2024 13:56	76,498	65,796,178	43,361,000	1,008,000	2,285,568
16	Mar 31, 2024 13:56	76,586	69,672,711	44,420,000	0	2,285,568
17	Mar 31, 2024 13:56	76,757	67,364,657	43,508,000	1,011,000	2,285,568
18	Mar 31, 2024 14:10	76,807	73,141,886	43,536,000	1,012,000	2,506,752
19	Mar 31, 2024 13:52	76,997	72,687,707	43,644,000	1,014,000	2,285,568
20	Mar 31, 2024 13:52	77,002	71,204,571	44,661,000	0	2,285,568
21	Mar 31, 2024 14:10	77,066	67,778,935	43,683,000	1,015,000	2,510,848
22	Mar 31, 2024 13:56	77,124	73,176,125	43,716,000	1,016,000	2,285,568
23	Mar 31, 2024 13:52	77,383	74,185,436	42,888,000	1,994,000	2,510,848
24	Mar 31, 2024 13:52	77,395	70,876,428	42,894,000	1,995,000	2,519,040
25	Mar 31, 2024 14:10	77,398	68,049,361	43,894,000	997,000	2,265,088
26	Mar 31, 2024 14:10	77,547	66,323,546	43,978,000	999,000	2,519,040
27	Mar 31, 2024 13:56	77,690	68,162,584	44,059,000	1,001,000	2,510,848
28	Mar 31, 2024 13:52	79,185	107,909,931	45,927,331	0	2,232,320
29	Mar 31, 2024 14:10	79,371	118,764,704	46,035,392	0	2,232,320
30	Mar 31, 2024 13:52	79,719	108,022,626	46,236,956	0	2,220,032
31	Mar 31, 2024 13:52	80,184	122,686,657	46,506,506	0	2,232,320
32	Mar 31, 2024 13:56	80,568	109,740,512	46,729,540	0	2,224,128
33	Mar 31, 2024 13:56	80,866	111,567,427	46,902,095	0	2,232,320
34	Mar 31, 2024 14:10	80,932	127,130,668	46,940,672	0	2,224,128
35	Mar 31, 2024 13:56	81,216	107,240,788	47,105,258	0	2,244,608
36	Mar 31, 2024 14:10	81,608	106,176,244	47,332,620	0	2,228,224

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