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.

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 30, 2026 10:38	3,149	66,286,947	33,616,000	1,018,000	2,277,376
2	Mar 30, 2026 10:42	3,149	60,336,501	33,622,000	1,018,000	2,400,256
3	Mar 30, 2026 10:34	3,151	66,115,420	33,638,000	1,019,000	2,396,160
4	Mar 30, 2026 10:32	3,151	62,521,851	33,643,000	1,019,000	2,277,376
5	Mar 30, 2026 10:42	3,152	61,710,483	33,650,000	1,019,000	2,396,160
6	Mar 30, 2026 10:32	3,152	66,941,737	34,673,000	0	2,396,160
7	Mar 30, 2026 10:34	3,153	64,834,134	33,664,000	1,020,000	2,277,376
8	Mar 30, 2026 10:36	3,154	59,753,512	34,692,000	0	2,277,376
9	Mar 30, 2026 10:30	3,156	72,413,606	34,714,000	0	2,404,352
10	Mar 30, 2026 10:36	3,165	61,672,535	32,827,000	1,989,000	2,396,160
11	Mar 30, 2026 10:37	3,166	63,656,610	32,839,000	1,990,000	2,404,352
12	Mar 30, 2026 10:34	3,166	59,521,368	32,835,000	1,990,000	2,510,848
13	Mar 30, 2026 10:38	3,167	56,873,292	32,843,000	1,990,000	2,277,376
14	Mar 30, 2026 10:40	3,167	61,634,266	33,847,000	995,000	2,277,376
15	Mar 30, 2026 10:36	3,168	61,302,847	32,859,000	1,991,000	2,404,352
16	Mar 30, 2026 10:36	3,168	64,674,120	33,852,000	995,000	2,396,160
17	Mar 30, 2026 10:34	3,168	64,483,618	32,855,000	1,991,000	2,277,376
18	Mar 30, 2026 10:33	3,168	67,909,735	33,853,000	995,000	2,277,376
19	Mar 30, 2026 10:40	3,168	69,484,771	32,857,000	1,991,000	2,277,376
20	Mar 30, 2026 10:40	3,168	62,541,905	34,844,000	0	2,277,376
21	Mar 30, 2026 10:40	3,168	63,975,080	33,850,000	995,000	2,277,376
22	Mar 30, 2026 10:42	3,168	64,969,755	34,844,000	0	2,400,256
23	Mar 30, 2026 10:43	3,168	61,846,745	33,848,000	995,000	2,277,376
24	Mar 30, 2026 10:29	3,168	63,979,227	34,849,000	0	2,392,064
25	Mar 30, 2026 10:39	3,169	59,668,338	33,859,000	995,000	2,400,256
26	Mar 30, 2026 10:39	3,169	59,172,263	33,866,000	996,000	2,510,848
27	Mar 30, 2026 10:38	3,169	62,800,412	33,864,000	996,000	2,277,376
28	Mar 30, 2026 10:29	3,169	65,236,460	33,859,000	995,000	2,400,256
29	Mar 30, 2026 10:41	3,169	60,741,625	33,859,000	995,000	2,277,376
30	Mar 30, 2026 10:36	3,169	64,886,227	32,866,000	1,991,000	2,396,160
31	Mar 30, 2026 10:41	3,169	64,607,416	33,863,000	995,000	2,277,376
32	Mar 30, 2026 10:35	3,169	66,710,655	32,868,000	1,992,000	2,396,160
33	Mar 30, 2026 10:31	3,169	61,900,475	32,863,000	1,991,000	2,400,256
34	Mar 30, 2026 10:31	3,169	59,451,925	33,863,000	995,000	2,277,376
35	Mar 30, 2026 10:32	3,169	67,134,611	33,865,000	996,000	2,277,376
36	Mar 30, 2026 10:32	3,169	65,320,684	34,858,000	0	2,392,064
37	Mar 30, 2026 10:43	3,170	65,941,521	33,869,000	996,000	2,482,176
38	Mar 30, 2026 10:33	3,171	59,169,944	33,881,000	996,000	2,277,376
39	Mar 30, 2026 10:37	3,172	62,416,274	32,901,000	1,994,000	2,277,376
40	Mar 30, 2026 10:39	3,173	57,072,845	33,908,000	997,000	2,277,376
41	Mar 30, 2026 10:35	3,174	60,672,717	33,922,000	997,000	2,277,376
42	Mar 30, 2026 10:32	3,175	59,201,300	33,924,000	997,000	2,408,448
43	Mar 30, 2026 10:35	3,176	58,821,371	32,936,000	1,996,000	2,400,256
44	Mar 30, 2026 10:37	3,176	65,171,558	32,942,000	1,996,000	2,277,376
45	Mar 30, 2026 10:43	3,179	55,084,100	32,972,000	1,998,000	2,396,160
46	Mar 30, 2026 10:29	3,179	56,458,476	33,970,000	999,000	2,404,352
47	Mar 30, 2026 10:30	3,179	61,769,056	32,970,000	1,998,000	2,277,376
48	Mar 30, 2026 10:40	3,179	62,612,639	32,974,000	1,998,000	2,277,376
49	Mar 30, 2026 10:30	3,180	60,003,728	33,981,000	999,000	2,273,280
50	Mar 30, 2026 10:33	3,182	64,593,122	34,004,000	1,000,000	2,277,376
51	Mar 30, 2026 10:40	3,184	59,810,196	33,024,000	2,001,000	2,277,376
52	Mar 30, 2026 10:32	3,185	58,391,046	34,030,000	1,000,000	2,277,376
53	Mar 30, 2026 10:34	3,185	58,470,386	33,029,000	2,001,000	2,396,160
54	Mar 30, 2026 10:36	3,186	65,378,517	34,044,000	1,001,000	2,277,376
55	Mar 30, 2026 10:41	3,187	60,120,372	34,052,000	1,001,000	2,404,352
56	Mar 30, 2026 10:31	3,191	68,625,160	33,096,000	2,005,000	2,277,376
57	Mar 30, 2026 10:34	3,207	58,184,379	34,270,000	1,007,000	2,404,352

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