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	Error
1	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
2	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
3	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
4	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
5	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
6	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
7	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
8	Feb 15, 2024 14:51	Error: expected "673943 ", got "677309"
9	Feb 15, 2024 14:51	Error: expected "935292 ", got "936924"
10	Feb 15, 2024 14:51	Error: expected "1300505 ", got "1300953"
11	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
12	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
13	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
14	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
15	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
16	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
17	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
18	Feb 15, 2024 14:50	Error: expected "687454 ", got "688021"
19	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
20	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
21	Feb 15, 2024 14:52	Error: expected "2697011 ", got "2695339"
22	Feb 15, 2024 16:21	Error: expected "3607066 ", got "3607792"
23	Feb 15, 2024 16:21	Error: expected "1152761 ", got "1152872"
24	Feb 15, 2024 16:21	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
25	Feb 15, 2024 16:21	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
26	Feb 15, 2024 14:52	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
27	Feb 15, 2024 14:52	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
28	Feb 15, 2024 14:52	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
29	Feb 15, 2024 14:52	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
30	Feb 15, 2024 14:52	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
31	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
32	Feb 15, 2024 14:52	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
33	Feb 15, 2024 14:52	Error: expected "1616595 ", got "1634041"
34	Feb 15, 2024 14:52	Error: expected "1849635 ", got "1853629"
35	Feb 15, 2024 14:52	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
36	Feb 15, 2024 14:52	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
37	Feb 15, 2024 14:52	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
38	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
39	Feb 15, 2024 14:51	Error: expected "742977 ", got "743058"
40	Feb 15, 2024 14:51	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
41	Feb 15, 2024 14:49	Error: expected "1406241 ", got "1424823"
42	Feb 15, 2024 14:49	Error: expected "2199147 ", got "2244526"
43	Feb 15, 2024 14:49	Error: expected "808798 ", got "807828"
44	Feb 15, 2024 14:49	Error: expected "4035969 ", got "4035665"
45	Feb 15, 2024 14:49	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
46	Feb 15, 2024 14:49	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
47	Feb 15, 2024 14:49	Error: expected "1835164 ", got "1837689"
48	Feb 15, 2024 14:49	Error: expected "833693 ", got "833461"
49	Feb 15, 2024 14:49	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
50	Feb 15, 2024 14:49	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
51	Feb 15, 2024 14:50	Error: expected "1672343 ", got "1669241"
52	Feb 15, 2024 14:49	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
53	Feb 15, 2024 14:49	Error: expected "1601022 ", got "1600838"
54	Feb 15, 2024 14:47	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
55	Feb 15, 2024 14:47	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
56	Feb 15, 2024 14:46	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
57	Feb 15, 2024 14:46	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
58	Feb 15, 2024 14:45	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
59	Feb 15, 2024 14:45	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
60	Feb 15, 2024 14:45	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
61	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
62	Feb 15, 2024 14:50	Error: expected "1100127 ", got "1102659"
63	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
64	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
65	Feb 15, 2024 14:50	Error: expected "2360081 ", got "2368142"
66	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
67	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
68	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
69	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
70	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
71	Feb 15, 2024 14:45	Error: expected "1209417 ", got "1207877"
72	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
73	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
74	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
75	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
76	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
77	Feb 15, 2024 14:50	Error: expected "1943578 ", got "1945396"
78	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr
79	Feb 15, 2024 14:50	Error: Exit with code 101: thread 'main' panicked at main.rs:108:36: index out of bounds: the len is 67 but the index is 67 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace	stderr

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