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 06:52	3,144	59,127,561	33,562,000	1,017,000	2,277,376
2	Mar 30, 2026 06:53	3,148	59,318,956	34,624,000	0	2,277,376
3	Mar 30, 2026 07:00	3,148	59,635,091	33,607,000	1,018,000	2,277,376
4	Mar 30, 2026 06:57	3,148	63,562,746	33,614,000	1,018,000	2,277,376
5	Mar 30, 2026 06:55	3,149	59,345,933	33,623,000	1,018,000	2,400,256
6	Mar 30, 2026 06:50	3,149	61,057,707	34,636,000	0	2,277,376
7	Mar 30, 2026 07:00	3,150	65,353,940	34,647,000	0	2,396,160
8	Mar 30, 2026 06:55	3,151	64,795,310	34,656,000	0	2,400,256
9	Mar 30, 2026 06:57	3,151	59,183,271	33,640,000	1,019,000	2,277,376
10	Mar 30, 2026 06:58	3,152	62,992,371	33,650,000	1,019,000	2,277,376
11	Mar 30, 2026 06:50	3,153	64,417,936	33,667,000	1,020,000	2,400,256
12	Mar 30, 2026 07:00	3,154	60,522,383	34,690,000	0	2,400,256
13	Mar 30, 2026 06:55	3,154	64,702,655	33,670,000	1,020,000	2,404,352
14	Mar 30, 2026 06:59	3,155	61,757,625	34,700,000	0	2,277,376
15	Mar 30, 2026 06:59	3,155	64,912,790	33,684,000	1,020,000	2,392,064
16	Mar 30, 2026 06:59	3,155	60,024,561	33,682,000	1,020,000	2,400,256
17	Mar 30, 2026 06:49	3,156	60,861,843	33,696,000	1,021,000	2,277,376
18	Mar 30, 2026 06:56	3,156	68,426,266	33,698,000	1,021,000	2,273,280
19	Mar 30, 2026 06:53	3,157	65,076,352	33,705,000	1,021,000	2,396,160
20	Mar 30, 2026 06:56	3,166	66,686,447	32,837,000	1,990,000	2,277,376
21	Mar 30, 2026 06:51	3,167	60,970,683	34,842,000	0	2,396,160
22	Mar 30, 2026 06:49	3,167	60,668,210	33,845,000	995,000	2,392,064
23	Mar 30, 2026 06:54	3,167	60,061,326	33,847,000	995,000	2,277,376
24	Mar 30, 2026 07:00	3,167	65,884,762	34,836,000	0	2,277,376
25	Mar 30, 2026 06:59	3,167	59,498,166	34,842,000	0	2,400,256
26	Mar 30, 2026 06:53	3,167	60,426,740	33,840,000	995,000	2,277,376
27	Mar 30, 2026 06:57	3,167	66,392,722	33,847,000	995,000	2,277,376
28	Mar 30, 2026 06:58	3,167	65,221,005	32,851,000	1,991,000	2,273,280
29	Mar 30, 2026 06:58	3,167	60,904,556	34,841,000	0	2,277,376
30	Mar 30, 2026 06:56	3,168	62,742,017	33,854,000	995,000	2,277,376
31	Mar 30, 2026 06:55	3,168	58,110,760	32,861,000	1,991,000	2,277,376
32	Mar 30, 2026 06:59	3,168	64,381,995	33,856,000	995,000	2,277,376
33	Mar 30, 2026 07:00	3,168	61,716,825	34,843,000	0	2,277,376
34	Mar 30, 2026 06:51	3,168	61,834,097	32,856,000	1,991,000	2,392,064
35	Mar 30, 2026 06:50	3,168	60,863,716	34,853,000	0	2,277,376
36	Mar 30, 2026 06:54	3,169	64,944,132	33,868,000	996,000	2,277,376
37	Mar 30, 2026 06:57	3,169	59,036,044	33,864,000	996,000	2,277,376
38	Mar 30, 2026 06:52	3,169	59,015,877	33,864,000	996,000	2,404,352
39	Mar 30, 2026 06:57	3,170	60,859,574	33,869,000	996,000	2,277,376
40	Mar 30, 2026 06:50	3,172	58,771,867	32,894,000	1,993,000	2,277,376
41	Mar 30, 2026 06:53	3,172	62,374,378	32,897,000	1,993,000	2,277,376
42	Mar 30, 2026 06:52	3,173	56,234,853	32,913,000	1,994,000	2,277,376
43	Mar 30, 2026 06:48	3,173	61,113,605	32,909,000	1,994,000	2,400,256
44	Mar 30, 2026 06:55	3,173	59,351,448	32,908,000	1,994,000	2,400,256
45	Mar 30, 2026 06:53	3,174	55,603,412	33,914,000	997,000	2,277,376
46	Mar 30, 2026 06:52	3,174	60,748,325	32,922,000	1,995,000	2,396,160
47	Mar 30, 2026 06:50	3,175	60,049,552	32,930,000	1,995,000	2,277,376
48	Mar 30, 2026 06:50	3,175	54,872,389	33,898,000	1,027,000	2,277,376
49	Mar 30, 2026 06:55	3,177	54,307,598	33,953,000	998,000	2,277,376
50	Mar 30, 2026 06:53	3,178	62,597,470	32,960,000	1,997,000	2,277,376
51	Mar 30, 2026 06:57	3,178	58,020,826	32,963,000	1,997,000	2,510,848
52	Mar 30, 2026 06:54	3,180	59,810,251	32,978,000	1,998,000	2,277,376
53	Mar 30, 2026 06:52	3,181	60,977,851	32,992,000	1,999,000	2,400,256
54	Mar 30, 2026 06:49	3,182	60,026,076	33,006,000	2,000,000	2,277,376
55	Mar 30, 2026 07:00	3,183	57,405,416	34,011,000	1,000,000	2,277,376
56	Mar 30, 2026 06:51	3,184	59,967,959	34,027,000	1,000,000	2,277,376
57	Mar 30, 2026 06:59	3,186	56,994,877	33,042,000	2,002,000	2,277,376
58	Mar 30, 2026 06:48	3,186	59,042,336	33,042,000	2,002,000	2,277,376
59	Mar 30, 2026 06:48	3,186	64,908,064	33,041,000	2,002,000	2,396,160
60	Mar 30, 2026 06:52	3,187	62,266,321	33,053,000	2,003,000	2,277,376

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