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	1:20.1.2-0ubuntu1~24.04.3	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	3.0.13-0ubuntu3.11	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 listDec 25, 2025 13:13

Hattonuri

Error

Source Code

Source code access is restricted. Log in to request access.

Challenge History

Date	Challenger	Cost	Type	Status
Jul 5, 2026 20:46	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 20:47	0	2,967,434,742	2,958,834,000	0	2,117,632	expected "999999000 ", got "100000 "
2	Jul 5, 2026 20:47	0	2,967,663,814	2,958,461,000	1,000,000	2,117,632	expected "999999000 ", got "100000 "
3	Jul 5, 2026 20:47	0	2,967,040,637	2,957,968,000	1,028,000	2,117,632	expected "999999000 ", got "100000 "
4	Dec 25, 2025 13:05	29,186	34,249,386	15,933,000	995,000	2,506,752
5	Dec 25, 2025 13:08	29,243	41,805,508	15,964,000	997,000	2,326,528
6	Dec 25, 2025 13:02	29,257	44,711,107	15,971,000	998,000	2,326,528
7	Dec 25, 2025 13:13	29,371	34,363,204	16,033,000	1,002,000	2,342,912
8	Dec 25, 2025 13:08	29,402	32,359,110	16,050,000	1,003,000	2,486,272
9	Dec 25, 2025 13:02	29,584	43,902,030	16,150,000	1,009,000	2,330,624
10	Dec 25, 2025 13:07	29,700	38,902,940	16,213,000	1,013,000	2,322,432
11	Dec 25, 2025 13:13	29,722	38,425,443	16,225,000	1,014,000	2,494,464
12	Dec 25, 2025 13:02	29,816	32,372,470	17,293,000	0	2,527,232
13	Dec 25, 2025 13:05	29,955	38,556,247	17,374,000	0	2,310,144
14	Dec 25, 2025 13:08	29,957	38,961,281	17,375,000	0	2,269,184
15	Dec 25, 2025 13:07	29,960	37,729,613	17,377,000	0	2,408,448
16	Dec 25, 2025 13:07	29,979	42,684,416	17,388,000	0	2,437,120
17	Dec 25, 2025 13:08	29,983	41,621,324	17,390,000	0	2,326,528
18	Dec 25, 2025 13:08	30,003	38,648,202	16,379,000	1,023,000	2,334,720
19	Dec 25, 2025 13:02	30,138	37,097,996	17,480,000	0	2,523,136
20	Dec 25, 2025 13:07	30,153	39,681,033	17,489,000	0	2,457,600
21	Dec 25, 2025 13:06	30,197	40,843,524	16,484,000	1,030,000	2,453,504
22	Dec 25, 2025 13:13	30,203	39,844,100	17,518,000	0	2,314,240
23	Dec 25, 2025 13:07	30,355	43,514,277	17,606,000	0	2,461,696
24	Dec 25, 2025 13:07	30,378	36,456,105	16,583,000	1,036,000	2,494,464
25	Dec 25, 2025 13:07	30,453	42,245,702	17,663,000	0	2,469,888
26	Dec 25, 2025 13:06	30,522	43,958,851	16,662,000	1,041,000	2,523,136
27	Dec 25, 2025 13:05	30,557	41,127,754	16,681,000	1,042,000	2,465,792
28	Dec 25, 2025 13:08	30,803	44,303,495	15,881,000	1,985,000	2,494,464
29	Dec 25, 2025 13:13	30,814	42,570,898	16,880,000	992,000	2,519,040
30	Dec 25, 2025 13:02	30,853	43,281,356	16,901,000	994,000	2,400,256
31	Dec 25, 2025 13:13	30,855	39,469,271	16,902,000	994,000	2,449,408
32	Dec 25, 2025 13:07	30,872	41,572,174	15,917,000	1,989,000	2,408,448
33	Dec 25, 2025 13:08	30,872	43,482,770	16,912,000	994,000	2,527,232
34	Dec 25, 2025 13:06	31,019	36,613,619	16,992,000	999,000	2,506,752
35	Dec 25, 2025 13:13	31,053	36,830,394	17,011,000	1,000,000	2,412,544
36	Dec 25, 2025 13:02	31,100	51,341,078	17,036,000	1,002,000	2,510,848
37	Dec 25, 2025 13:08	31,116	39,284,816	17,045,000	1,002,000	2,482,176
38	Dec 25, 2025 13:08	31,131	43,040,556	17,053,000	1,003,000	2,441,216
39	Dec 25, 2025 13:02	31,276	41,902,209	17,133,000	1,007,000	2,441,216
40	Dec 25, 2025 13:02	31,307	42,219,786	17,150,000	1,008,000	2,379,776
41	Dec 25, 2025 13:07	31,688	39,692,981	17,358,000	1,021,000	2,486,272
42	Dec 25, 2025 13:02	31,690	47,137,477	18,380,000	0	2,486,272

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