Parse JSON

Compute the total amount of non-canceled external USD transactions from a stream of JSON records as fast as possible.

Input: 1 000 000 JSON records on STDIN, one per line. Each record has the following structure:

{
    "user_id": 0,
    "currency": "USD",
    "transactions": [
        {
            "amount": 0,
            "to_user_id": 0,
            "canceled": false
        }
    ]
}

Field	Constraints
`user_id`	Integer, max 10 000
`currency`	One of `"GBP"`, `"USD"`, `"RUB"`, `"JPY"`, `"CHF"`
`transactions`	Array, max 10 elements
`amount`	Integer, max 1000
`canceled`	Boolean; may be omitted when `false`

Field order is not guaranteed within any object.

Output: The total amount of all transactions where:

record.currency == "USD"
transaction.to_user_id != record.user_id (external)
transaction.canceled is false or absent

Restrictions:60s512Mb 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 30, 2026 07:31

olliecrowScore: 3,170Success

Source Code

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

Challenge History

No challenges yet.

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 30, 2026 07:29	3,150	59,430,183	33,631,000	1,019,000	2,400,256
2	Mar 30, 2026 07:35	3,151	63,006,438	33,643,000	1,019,000	2,277,376
3	Mar 30, 2026 07:33	3,151	58,513,989	33,641,000	1,019,000	2,277,376
4	Mar 30, 2026 07:38	3,152	68,222,715	33,648,000	1,019,000	2,396,160
5	Mar 30, 2026 07:33	3,152	64,424,356	34,674,000	0	2,392,064
6	Mar 30, 2026 07:38	3,154	64,366,852	34,692,000	0	2,277,376
7	Mar 30, 2026 07:35	3,164	63,125,468	32,817,000	1,988,000	2,277,376
8	Mar 30, 2026 07:34	3,166	59,142,624	32,836,000	1,990,000	2,400,256
9	Mar 30, 2026 07:34	3,167	60,673,888	34,835,000	0	2,277,376
10	Mar 30, 2026 07:35	3,167	62,649,806	34,835,000	0	2,277,376
11	Mar 30, 2026 07:32	3,167	58,634,985	32,846,000	1,990,000	2,400,256
12	Mar 30, 2026 07:30	3,168	63,213,159	32,862,000	1,991,000	2,396,160
13	Mar 30, 2026 07:35	3,168	61,079,503	32,861,000	1,991,000	2,277,376
14	Mar 30, 2026 07:36	3,168	58,980,854	33,848,000	995,000	2,510,848
15	Mar 30, 2026 07:41	3,168	63,596,797	33,858,000	995,000	2,400,256
16	Mar 30, 2026 07:33	3,168	59,546,070	33,851,000	995,000	2,392,064
17	Mar 30, 2026 07:37	3,168	65,278,277	33,851,000	995,000	2,277,376
18	Mar 30, 2026 07:38	3,168	65,223,639	33,857,000	995,000	2,277,376
19	Mar 30, 2026 07:39	3,168	68,458,128	34,846,000	0	2,277,376
20	Mar 30, 2026 07:39	3,168	65,731,130	34,851,000	0	2,277,376
21	Mar 30, 2026 07:40	3,169	65,991,838	32,864,000	1,991,000	2,404,352
22	Mar 30, 2026 07:37	3,169	63,050,369	33,862,000	995,000	2,277,376
23	Mar 30, 2026 07:29	3,169	60,700,387	33,862,000	995,000	2,404,352
24	Mar 30, 2026 07:42	3,169	70,014,487	34,860,000	0	2,400,256
25	Mar 30, 2026 07:39	3,169	63,171,538	33,861,000	995,000	2,396,160
26	Mar 30, 2026 07:39	3,169	65,120,547	33,861,000	995,000	2,392,064
27	Mar 30, 2026 07:31	3,169	60,454,581	32,863,000	1,991,000	2,396,160
28	Mar 30, 2026 07:33	3,169	63,260,049	33,863,000	995,000	2,277,376
29	Mar 30, 2026 07:30	3,169	59,690,266	33,864,000	996,000	2,277,376
30	Mar 30, 2026 07:35	3,170	55,313,738	32,878,000	1,992,000	2,277,376
31	Mar 30, 2026 07:36	3,170	59,961,562	33,869,000	996,000	2,396,160
32	Mar 30, 2026 07:32	3,170	54,943,409	33,874,000	996,000	2,277,376
33	Mar 30, 2026 07:39	3,170	60,992,376	33,878,000	996,000	2,404,352
34	Mar 30, 2026 07:37	3,171	59,801,558	34,880,000	0	2,387,968
35	Mar 30, 2026 07:40	3,171	64,227,161	33,887,000	996,000	2,277,376
36	Mar 30, 2026 07:30	3,171	58,475,737	33,855,000	1,025,000	2,277,376
37	Mar 30, 2026 07:34	3,171	60,154,349	32,889,000	1,993,000	2,396,160
38	Mar 30, 2026 07:37	3,172	61,068,777	32,899,000	1,993,000	2,277,376
39	Mar 30, 2026 07:36	3,172	59,400,613	33,869,000	1,026,000	2,277,376
40	Mar 30, 2026 07:42	3,172	58,131,679	33,898,000	997,000	2,277,376
41	Mar 30, 2026 07:30	3,173	61,074,547	32,911,000	1,994,000	2,404,352
42	Mar 30, 2026 07:40	3,173	59,720,435	32,912,000	1,994,000	2,404,352
43	Mar 30, 2026 07:30	3,173	60,867,979	32,908,000	1,994,000	2,277,376
44	Mar 30, 2026 07:37	3,173	64,777,241	33,904,000	997,000	2,277,376
45	Mar 30, 2026 07:29	3,173	59,943,148	33,906,000	997,000	2,277,376
46	Mar 30, 2026 07:41	3,175	58,342,967	32,925,000	1,995,000	2,277,376
47	Mar 30, 2026 07:33	3,175	57,818,683	33,928,000	997,000	2,510,848
48	Mar 30, 2026 07:40	3,176	60,322,338	32,942,000	1,996,000	2,277,376
49	Mar 30, 2026 07:40	3,176	60,128,354	32,937,000	1,996,000	2,400,256
50	Mar 30, 2026 07:42	3,176	52,620,035	32,941,000	1,996,000	2,392,064
51	Mar 30, 2026 07:30	3,176	59,087,997	32,937,000	1,996,000	2,277,376
52	Mar 30, 2026 07:40	3,177	56,944,889	32,952,000	1,997,000	2,277,376
53	Mar 30, 2026 07:35	3,177	59,055,697	33,950,000	998,000	2,277,376
54	Mar 30, 2026 07:41	3,180	61,813,604	33,984,000	999,000	2,277,376
55	Mar 30, 2026 07:32	3,180	63,962,640	32,981,000	1,998,000	2,277,376
56	Mar 30, 2026 07:31	3,181	62,380,494	32,987,000	1,999,000	2,277,376
57	Mar 30, 2026 07:31	3,181	61,547,097	32,994,000	1,999,000	2,396,160
58	Mar 30, 2026 07:39	3,182	55,765,855	33,005,000	2,000,000	2,404,352
59	Mar 30, 2026 07:33	3,183	59,373,611	34,014,000	1,000,000	2,404,352
60	Mar 30, 2026 07:37	3,188	65,321,308	35,070,000	0	2,277,376

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