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 20:04	3,148	63,079,970	33,607,000	1,018,000	2,392,064
2	Mar 30, 2026 20:12	3,150	61,809,781	33,636,000	1,019,000	2,277,376
3	Mar 30, 2026 20:03	3,153	60,931,483	34,687,000	0	2,277,376
4	Mar 30, 2026 20:07	3,153	60,434,796	34,679,000	0	2,277,376
5	Mar 30, 2026 20:06	3,155	61,881,962	34,701,000	0	2,404,352
6	Mar 30, 2026 20:10	3,158	64,794,571	33,713,000	1,021,000	2,277,376
7	Mar 30, 2026 20:02	3,160	60,630,131	33,764,000	993,000	2,400,256
8	Mar 30, 2026 20:08	3,167	62,968,559	32,848,000	1,990,000	2,400,256
9	Mar 30, 2026 20:13	3,167	70,542,918	34,839,000	0	2,408,448
10	Mar 30, 2026 20:11	3,167	54,241,869	32,850,000	1,990,000	2,273,280
11	Mar 30, 2026 20:10	3,167	61,581,487	33,843,000	995,000	2,392,064
12	Mar 30, 2026 20:01	3,167	64,731,244	34,835,000	0	2,400,256
13	Mar 30, 2026 20:03	3,167	62,664,709	34,838,000	0	2,277,376
14	Mar 30, 2026 20:03	3,168	63,585,960	34,845,000	0	2,277,376
15	Mar 30, 2026 20:07	3,168	61,114,626	33,848,000	995,000	2,277,376
16	Mar 30, 2026 20:01	3,168	61,362,739	34,850,000	0	2,400,256
17	Mar 30, 2026 20:05	3,168	67,421,417	33,858,000	995,000	2,277,376
18	Mar 30, 2026 20:08	3,168	65,073,592	32,858,000	1,991,000	2,400,256
19	Mar 30, 2026 20:01	3,168	59,475,444	32,862,000	1,991,000	2,277,376
20	Mar 30, 2026 20:09	3,168	61,446,560	32,856,000	1,991,000	2,400,256
21	Mar 30, 2026 20:09	3,168	54,955,193	32,858,000	1,991,000	2,387,968
22	Mar 30, 2026 20:10	3,168	64,864,190	33,857,000	995,000	2,277,376
23	Mar 30, 2026 19:59	3,168	58,979,729	33,822,000	1,024,000	2,277,376
24	Mar 30, 2026 20:13	3,168	62,420,314	34,846,000	0	2,277,376
25	Mar 30, 2026 20:05	3,169	65,570,035	33,866,000	996,000	2,277,376
26	Mar 30, 2026 20:14	3,169	59,040,380	33,862,000	995,000	2,277,376
27	Mar 30, 2026 20:12	3,169	64,292,627	34,857,000	0	2,277,376
28	Mar 30, 2026 20:00	3,169	60,834,310	32,866,000	1,991,000	2,482,176
29	Mar 30, 2026 20:03	3,169	69,343,785	33,867,000	996,000	2,383,872
30	Mar 30, 2026 20:14	3,169	65,565,887	32,867,000	1,991,000	2,277,376
31	Mar 30, 2026 19:59	3,169	58,468,037	32,872,000	1,992,000	2,277,376
32	Mar 30, 2026 20:00	3,169	59,231,995	32,871,000	1,992,000	2,277,376
33	Mar 30, 2026 20:02	3,169	68,233,075	33,868,000	996,000	2,277,376
34	Mar 30, 2026 19:59	3,170	59,526,192	32,881,000	1,992,000	2,392,064
35	Mar 30, 2026 20:04	3,170	61,083,372	33,871,000	996,000	2,277,376
36	Mar 30, 2026 20:00	3,170	66,535,668	33,870,000	996,000	2,392,064
37	Mar 30, 2026 20:12	3,171	60,922,488	33,880,000	996,000	2,400,256
38	Mar 30, 2026 19:58	3,171	59,801,833	33,887,000	996,000	2,273,280
39	Mar 30, 2026 20:08	3,172	60,760,657	33,899,000	997,000	2,277,376
40	Mar 30, 2026 20:13	3,174	62,201,937	32,923,000	1,995,000	2,277,376
41	Mar 30, 2026 20:06	3,174	59,279,839	33,918,000	997,000	2,392,064
42	Mar 30, 2026 19:58	3,175	55,179,218	33,926,000	997,000	2,510,848
43	Mar 30, 2026 20:05	3,176	54,564,692	32,939,000	1,996,000	2,277,376
44	Mar 30, 2026 20:11	3,177	59,148,656	33,952,000	998,000	2,404,352
45	Mar 30, 2026 20:03	3,178	57,817,123	32,959,000	1,997,000	2,396,160
46	Mar 30, 2026 20:10	3,178	62,697,352	32,962,000	1,997,000	2,277,376
47	Mar 30, 2026 19:57	3,178	64,756,074	33,960,000	998,000	2,277,376
48	Mar 30, 2026 20:02	3,179	62,420,686	33,970,000	999,000	2,277,376
49	Mar 30, 2026 20:09	3,180	60,964,904	33,979,000	999,000	2,277,376
50	Mar 30, 2026 20:04	3,180	56,376,866	33,977,000	999,000	2,277,376
51	Mar 30, 2026 20:11	3,181	61,857,766	32,991,000	1,999,000	2,396,160
52	Mar 30, 2026 19:58	3,182	59,342,379	32,998,000	1,999,000	2,277,376
53	Mar 30, 2026 20:10	3,182	62,589,152	33,003,000	2,000,000	2,277,376
54	Mar 30, 2026 20:03	3,183	60,305,216	34,017,000	1,000,000	2,392,064
55	Mar 30, 2026 20:07	3,184	59,110,405	33,024,000	2,001,000	2,277,376
56	Mar 30, 2026 19:57	3,185	59,764,875	34,032,000	1,000,000	2,277,376
57	Mar 30, 2026 19:57	3,185	60,240,412	33,037,000	2,002,000	2,482,176
58	Mar 30, 2026 20:14	3,186	62,149,419	34,040,000	1,001,000	2,383,872
59	Mar 30, 2026 20:10	3,187	66,664,972	34,059,000	1,001,000	2,392,064
60	Mar 30, 2026 20:06	3,189	56,714,462	34,082,000	1,002,000	2,277,376

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