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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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Feb 8, 2025 23:50	0	0	0	0	0	Error: expected "1296970 ", got "1304810 "	stderr
2	Feb 8, 2025 23:48	0	0	0	0	0	Error: expected "1905804 ", got "2026828 "	stderr
3	Feb 8, 2025 23:48	0	0	0	0	0	Error: expected "946614 ", got "1199424 "	stderr
4	Feb 8, 2025 23:48	0	0	0	0	0	Error: expected "1916825 ", got "1927093 "
5	Feb 8, 2025 23:48	0	0	0	0	0	Error: expected "1326408 ", got "1327188 "
6	Feb 8, 2025 23:48	0	0	0	0	0	Error: expected "1303627 ", got "1305333 "
7	Feb 8, 2025 23:48	0	0	0	0	0	Error: expected "1719381 ", got "1725590 "	stderr
8	Feb 8, 2025 23:48	0	0	0	0	0	Error: expected "918801 ", got "1975205 "	stderr
9	Feb 8, 2025 23:48	0	0	0	0	0	Error: expected "1016748 ", got "1018375 "
10	Feb 8, 2025 23:49	0	0	0	0	0	Error: expected "2153189 ", got "2380535 "	stderr
11	Feb 8, 2025 23:49	0	0	0	0	0	Error: expected "902656 ", got "1315717 "
12	Feb 8, 2025 23:49	0	0	0	0	0	Error: expected "3411831 ", got "3440413 "	stderr
13	Feb 8, 2025 23:49	0	0	0	0	0	Error: expected "1708278 ", got "1715894 "	stderr
14	Feb 8, 2025 23:49	0	0	0	0	0	Error: expected "1090331 ", got "1175287 "	stderr
15	Feb 8, 2025 23:49	0	0	0	0	0	Error: expected "1285251 ", got "1292259 "
16	Feb 8, 2025 23:48	0	0	0	0	0	Error: expected "1379543 ", got "1388728 "	stderr
17	Feb 8, 2025 23:50	0	0	0	0	0	Error: expected "616125 ", got "663482 "	stderr
18	Feb 8, 2025 23:50	0	0	0	0	0	Error: expected "3013933 ", got "3099226 "	stderr
19	Feb 8, 2025 23:50	0	0	0	0	0	Error: expected "1290711 ", got "1422488 "
20	Feb 8, 2025 23:50	0	0	0	0	0	Error: expected "1185473 ", got "1856491 "	stderr
21	Feb 8, 2025 23:50	0	0	0	0	0	Error: expected "2883179 ", got "2883401 "	stderr
22	Feb 8, 2025 23:50	0	0	0	0	0	Error: expected "1064075 ", got "1515738 "	stderr
23	Feb 8, 2025 23:50	0	0	0	0	0	Error: expected "1432333 ", got "1446604 "	stderr
24	Feb 8, 2025 23:50	0	0	0	0	0	Error: expected "551354 ", got "558475 "
25	Feb 8, 2025 23:51	0	0	0	0	0	Error: expected "1506809 ", got "1535238 "	stderr
26	Feb 8, 2025 23:51	0	0	0	0	0	Error: expected "1616868 ", got "1619936 "
27	Feb 8, 2025 23:51	0	0	0	0	0	Error: expected "3141210 ", got "3153479 "	stderr
28	Feb 8, 2025 23:51	0	0	0	0	0	Error: expected "950193 ", got "1123931 "
29	Feb 8, 2025 23:51	0	0	0	0	0	Error: expected "3432725 ", got "3490431 "	stderr
30	Feb 8, 2025 23:47	0	0	0	0	0	Error: expected "2522009 ", got "2523429 "
31	Feb 8, 2025 23:45	0	0	0	0	0	Error: expected "853670 ", got "868065 "	stderr
32	Feb 8, 2025 23:45	0	0	0	0	0	Error: expected "1594865 ", got "1602635 "	stderr
33	Feb 8, 2025 23:46	0	0	0	0	0	Error: expected "950568 ", got "951914 "	stderr
34	Feb 8, 2025 23:46	0	0	0	0	0	Error: expected "1504279 ", got "1609889 "	stderr
35	Feb 8, 2025 23:46	0	0	0	0	0	Error: expected "2135728 ", got "2136443 "	stderr
36	Feb 8, 2025 23:46	0	0	0	0	0	Error: expected "920764 ", got "1020930 "
37	Feb 8, 2025 23:46	0	0	0	0	0	Error: expected "1704430 ", got "1708912 "
38	Feb 8, 2025 23:46	0	0	0	0	0	Error: expected "2264376 ", got "2264726 "	stderr
39	Feb 8, 2025 23:46	0	0	0	0	0	Error: expected "975552 ", got "996858 "
40	Feb 8, 2025 23:46	0	0	0	0	0	Error: expected "2386098 ", got "2388116 "	stderr
41	Feb 8, 2025 23:47	0	0	0	0	0	Error: expected "589741 ", got "887388 "
42	Feb 8, 2025 23:47	0	0	0	0	0	Error: expected "1592861 ", got "1593485 "	stderr
43	Feb 8, 2025 23:47	0	0	0	0	0	Error: expected "580400 ", got "587141 "	stderr
44	Feb 8, 2025 23:47	0	0	0	0	0	Error: expected "1373893 ", got "1407575 "	stderr
45	Feb 8, 2025 23:47	0	0	0	0	0	Error: expected "948216 ", got "2071852 "
46	Feb 8, 2025 23:47	0	0	0	0	0	Error: expected "2993361 ", got "3038433 "	stderr
47	Feb 8, 2025 23:47	0	0	0	0	0	Error: expected "1519482 ", got "1544048 "	stderr
48	Feb 8, 2025 23:46	0	0	0	0	0	Error: expected "830892 ", got "847701 "	stderr
49	Feb 8, 2025 23:49	69,516	64,166,872	40,319,000	0	2,535,424
50	Feb 8, 2025 23:49	69,581	73,437,030	40,357,000	0	2,527,232
51	Feb 8, 2025 23:49	69,650	62,707,765	39,388,000	1,009,000	2,412,544
52	Feb 8, 2025 23:49	69,657	64,455,146	39,391,000	1,010,000	2,420,736
53	Feb 8, 2025 23:49	69,707	63,447,994	40,430,000	0	2,420,736
54	Feb 8, 2025 23:49	69,790	65,778,163	39,467,000	1,011,000	2,433,024
55	Feb 8, 2025 23:49	69,793	72,985,474	40,480,000	0	2,424,832
56	Feb 8, 2025 23:49	69,845	59,511,651	40,510,000	0	2,535,424
57	Feb 8, 2025 23:49	69,933	61,826,119	39,547,000	1,014,000	2,420,736

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