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 21:57	3,151	60,329,174	34,658,000	0	2,506,752
2	Mar 30, 2026 22:15	3,152	62,619,123	33,652,000	1,019,000	2,277,376
3	Mar 30, 2026 22:11	3,153	65,158,328	33,667,000	1,020,000	2,277,376
4	Mar 30, 2026 22:01	3,154	60,183,102	34,692,000	0	2,392,064
5	Mar 30, 2026 22:13	3,166	62,179,684	32,836,000	1,990,000	2,277,376
6	Mar 30, 2026 22:07	3,167	61,888,463	33,844,000	995,000	2,510,848
7	Mar 30, 2026 22:08	3,167	60,601,083	33,838,000	995,000	2,277,376
8	Mar 30, 2026 22:04	3,167	60,772,447	32,842,000	1,990,000	2,400,256
9	Mar 30, 2026 22:13	3,167	64,424,522	33,847,000	995,000	2,277,376
10	Mar 30, 2026 22:00	3,168	63,414,091	33,853,000	995,000	2,277,376
11	Mar 30, 2026 22:06	3,168	65,165,675	33,858,000	995,000	2,277,376
12	Mar 30, 2026 21:59	3,168	60,014,441	33,850,000	995,000	2,277,376
13	Mar 30, 2026 22:12	3,168	60,702,245	33,855,000	995,000	2,277,376
14	Mar 30, 2026 22:05	3,168	64,377,489	33,850,000	995,000	2,277,376
15	Mar 30, 2026 22:12	3,168	60,463,690	33,852,000	995,000	2,502,656
16	Mar 30, 2026 22:03	3,168	61,031,572	32,858,000	1,991,000	2,277,376
17	Mar 30, 2026 21:58	3,168	60,896,350	32,862,000	1,991,000	2,277,376
18	Mar 30, 2026 22:04	3,168	64,335,219	33,852,000	995,000	2,400,256
19	Mar 30, 2026 22:05	3,169	64,894,902	32,865,000	1,991,000	2,277,376
20	Mar 30, 2026 22:10	3,169	60,435,505	32,864,000	1,991,000	2,404,352
21	Mar 30, 2026 22:08	3,169	65,648,238	33,866,000	996,000	2,277,376
22	Mar 30, 2026 22:00	3,170	63,326,160	32,881,000	1,992,000	2,277,376
23	Mar 30, 2026 22:15	3,170	65,524,396	33,873,000	996,000	2,396,160
24	Mar 30, 2026 21:58	3,170	67,753,857	32,873,000	1,992,000	2,277,376
25	Mar 30, 2026 22:02	3,170	61,230,192	33,877,000	996,000	2,277,376
26	Mar 30, 2026 22:14	3,170	65,437,408	32,881,000	1,992,000	2,404,352
27	Mar 30, 2026 22:14	3,170	62,783,528	32,877,000	1,992,000	2,273,280
28	Mar 30, 2026 22:07	3,171	61,922,170	33,889,000	996,000	2,392,064
29	Mar 30, 2026 22:07	3,171	64,389,928	32,885,000	1,993,000	2,387,968
30	Mar 30, 2026 22:15	3,171	63,548,758	33,888,000	996,000	2,400,256
31	Mar 30, 2026 21:59	3,172	63,133,882	33,892,000	996,000	2,277,376
32	Mar 30, 2026 22:09	3,172	65,628,929	33,898,000	997,000	2,277,376
33	Mar 30, 2026 22:04	3,173	55,906,689	33,905,000	997,000	2,404,352
34	Mar 30, 2026 22:01	3,173	62,324,765	32,907,000	1,994,000	2,408,448
35	Mar 30, 2026 22:06	3,174	57,527,490	33,920,000	997,000	2,277,376
36	Mar 30, 2026 22:06	3,174	56,101,641	32,924,000	1,995,000	2,277,376
37	Mar 30, 2026 22:14	3,174	63,773,508	32,924,000	1,995,000	2,396,160
38	Mar 30, 2026 22:11	3,174	61,779,369	32,916,000	1,994,000	2,277,376
39	Mar 30, 2026 21:57	3,175	56,803,679	32,928,000	1,995,000	2,396,160
40	Mar 30, 2026 22:12	3,175	56,642,656	33,925,000	997,000	2,404,352
41	Mar 30, 2026 22:14	3,176	56,872,446	32,941,000	1,996,000	2,404,352
42	Mar 30, 2026 22:01	3,176	59,214,768	33,934,000	998,000	2,277,376
43	Mar 30, 2026 22:02	3,176	61,599,002	33,937,000	998,000	2,277,376
44	Mar 30, 2026 22:09	3,177	57,712,972	32,952,000	1,997,000	2,277,376
45	Mar 30, 2026 22:14	3,177	56,852,294	33,953,000	998,000	2,277,376
46	Mar 30, 2026 21:57	3,178	63,189,122	32,958,000	1,997,000	2,277,376
47	Mar 30, 2026 22:03	3,180	63,147,865	33,976,000	999,000	2,277,376
48	Mar 30, 2026 21:59	3,180	64,983,517	32,977,000	1,998,000	2,277,376
49	Mar 30, 2026 22:11	3,181	60,937,647	33,992,000	999,000	2,396,160
50	Mar 30, 2026 22:08	3,181	56,139,659	33,988,000	999,000	2,510,848
51	Mar 30, 2026 22:13	3,182	61,759,927	34,001,000	1,000,000	2,396,160
52	Mar 30, 2026 22:09	3,184	56,121,135	33,018,000	2,001,000	2,277,376
53	Mar 30, 2026 22:14	3,184	56,719,360	33,021,000	2,001,000	2,482,176
54	Mar 30, 2026 22:10	3,184	55,712,208	33,027,000	2,001,000	2,277,376
55	Mar 30, 2026 22:00	3,186	58,997,227	34,040,000	1,001,000	2,277,376
56	Mar 30, 2026 21:58	3,186	62,043,210	34,047,000	1,001,000	2,387,968
57	Mar 30, 2026 22:10	3,187	64,344,770	35,055,000	0	2,277,376
58	Mar 30, 2026 22:02	3,188	57,088,619	34,067,000	1,001,000	2,277,376
59	Mar 30, 2026 22:05	3,190	59,417,694	34,087,000	1,002,000	2,396,160
60	Mar 30, 2026 22:03	3,192	57,226,186	34,105,000	1,003,000	2,408,448

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