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 12:21	3,149	63,091,724	34,641,000	0	2,277,376
2	Mar 30, 2026 12:22	3,151	61,350,458	34,665,000	0	2,277,376
3	Mar 30, 2026 12:17	3,151	64,200,199	34,656,000	0	2,400,256
4	Mar 30, 2026 12:21	3,152	59,864,855	34,668,000	0	2,277,376
5	Mar 30, 2026 12:23	3,153	62,092,379	33,660,000	1,020,000	2,277,376
6	Mar 30, 2026 12:23	3,156	60,605,903	34,718,000	0	2,277,376
7	Mar 30, 2026 12:27	3,156	60,305,027	33,698,000	1,021,000	2,396,160
8	Mar 30, 2026 12:26	3,166	62,097,315	32,836,000	1,990,000	2,400,256
9	Mar 30, 2026 12:22	3,167	63,698,305	33,846,000	995,000	2,277,376
10	Mar 30, 2026 12:25	3,167	61,095,225	32,848,000	1,990,000	2,277,376
11	Mar 30, 2026 12:20	3,167	60,007,478	32,844,000	1,990,000	2,277,376
12	Mar 30, 2026 12:26	3,167	63,608,539	33,843,000	995,000	2,400,256
13	Mar 30, 2026 12:24	3,167	60,798,900	32,845,000	1,990,000	2,277,376
14	Mar 30, 2026 12:26	3,168	60,760,106	33,850,000	995,000	2,396,160
15	Mar 30, 2026 12:23	3,168	65,933,055	33,856,000	995,000	2,277,376
16	Mar 30, 2026 12:26	3,168	64,597,782	33,853,000	995,000	2,273,280
17	Mar 30, 2026 12:19	3,168	61,143,909	33,854,000	995,000	2,277,376
18	Mar 30, 2026 12:28	3,168	63,963,641	33,851,000	995,000	2,277,376
19	Mar 30, 2026 12:25	3,168	59,640,152	33,851,000	995,000	2,277,376
20	Mar 30, 2026 12:28	3,168	59,976,265	32,854,000	1,991,000	2,277,376
21	Mar 30, 2026 12:27	3,168	60,773,719	32,856,000	1,991,000	2,277,376
22	Mar 30, 2026 12:25	3,168	59,548,481	32,853,000	1,991,000	2,277,376
23	Mar 30, 2026 12:27	3,168	61,062,208	34,849,000	0	2,277,376
24	Mar 30, 2026 12:20	3,168	66,238,011	32,858,000	1,991,000	2,277,376
25	Mar 30, 2026 12:19	3,169	59,777,613	33,866,000	996,000	2,519,040
26	Mar 30, 2026 12:21	3,169	63,033,754	33,866,000	996,000	2,277,376
27	Mar 30, 2026 12:17	3,169	59,676,274	32,871,000	1,992,000	2,277,376
28	Mar 30, 2026 12:19	3,169	59,915,260	33,859,000	995,000	2,277,376
29	Mar 30, 2026 12:23	3,169	61,514,720	33,862,000	995,000	2,277,376
30	Mar 30, 2026 12:23	3,170	65,365,931	32,875,000	1,992,000	2,277,376
31	Mar 30, 2026 12:21	3,170	65,115,015	33,872,000	996,000	2,396,160
32	Mar 30, 2026 12:17	3,170	61,045,619	34,870,000	0	2,396,160
33	Mar 30, 2026 12:26	3,170	66,829,766	32,880,000	1,992,000	2,277,376
34	Mar 30, 2026 12:15	3,171	54,181,041	32,892,000	1,993,000	2,277,376
35	Mar 30, 2026 12:22	3,171	54,810,406	32,887,000	1,993,000	2,523,136
36	Mar 30, 2026 12:23	3,172	60,576,502	33,871,000	1,026,000	2,273,280
37	Mar 30, 2026 12:17	3,172	52,376,009	32,903,000	1,994,000	2,490,368
38	Mar 30, 2026 12:14	3,172	65,070,434	34,895,000	0	2,392,064
39	Mar 30, 2026 12:21	3,174	61,575,098	33,920,000	997,000	2,277,376
40	Mar 30, 2026 12:19	3,174	57,819,586	32,920,000	1,995,000	2,277,376
41	Mar 30, 2026 12:26	3,175	61,653,532	32,933,000	1,995,000	2,277,376
42	Mar 30, 2026 12:14	3,175	56,065,290	33,925,000	997,000	2,277,376
43	Mar 30, 2026 12:24	3,176	56,837,062	32,937,000	1,996,000	2,400,256
44	Mar 30, 2026 12:14	3,176	55,508,078	32,945,000	1,996,000	2,392,064
45	Mar 30, 2026 12:20	3,176	54,620,440	32,944,000	1,996,000	2,392,064
46	Mar 30, 2026 12:21	3,176	60,919,853	33,939,000	998,000	2,392,064
47	Mar 30, 2026 12:19	3,177	58,836,974	32,946,000	1,996,000	2,396,160
48	Mar 30, 2026 12:18	3,177	58,305,094	33,944,000	998,000	2,404,352
49	Mar 30, 2026 12:18	3,177	59,041,582	32,949,000	1,996,000	2,387,968
50	Mar 30, 2026 12:17	3,181	58,686,773	32,996,000	1,999,000	2,404,352
51	Mar 30, 2026 12:17	3,182	59,407,557	34,003,000	1,000,000	2,277,376
52	Mar 30, 2026 12:16	3,182	62,547,301	33,005,000	2,000,000	2,392,064
53	Mar 30, 2026 12:24	3,182	60,132,368	33,002,000	2,000,000	2,277,376
54	Mar 30, 2026 12:19	3,183	56,907,868	34,015,000	1,000,000	2,277,376
55	Mar 30, 2026 12:15	3,184	59,492,317	33,025,000	2,001,000	2,277,376
56	Mar 30, 2026 12:18	3,185	57,901,136	33,033,000	2,002,000	2,277,376
57	Mar 30, 2026 12:16	3,185	56,708,788	34,039,000	1,001,000	2,400,256
58	Mar 30, 2026 12:15	3,187	58,819,755	33,050,000	2,003,000	2,396,160
59	Mar 30, 2026 12:16	3,188	61,929,695	34,071,000	1,002,000	2,494,464
60	Mar 30, 2026 12:28	3,189	56,857,050	33,073,000	2,004,000	2,387,968

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