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 04:54	3,149	62,658,296	33,618,000	1,018,000	2,404,352
2	Mar 30, 2026 04:56	3,150	61,641,648	34,647,000	0	2,404,352
3	Mar 30, 2026 05:04	3,153	60,759,043	34,686,000	0	2,277,376
4	Mar 30, 2026 04:59	3,154	63,276,134	34,697,000	0	2,277,376
5	Mar 30, 2026 05:06	3,154	63,760,445	34,692,000	0	2,396,160
6	Mar 30, 2026 04:54	3,155	61,277,776	34,706,000	0	2,408,448
7	Mar 30, 2026 04:55	3,164	60,896,989	32,811,000	1,988,000	2,392,064
8	Mar 30, 2026 04:55	3,164	63,128,730	33,806,000	994,000	2,277,376
9	Mar 30, 2026 05:05	3,166	64,518,211	33,835,000	995,000	2,277,376
10	Mar 30, 2026 05:04	3,166	68,873,279	33,835,000	995,000	2,400,256
11	Mar 30, 2026 04:55	3,167	60,758,457	33,843,000	995,000	2,404,352
12	Mar 30, 2026 05:01	3,167	61,338,925	32,850,000	1,990,000	2,400,256
13	Mar 30, 2026 04:59	3,167	55,207,357	34,838,000	0	2,277,376
14	Mar 30, 2026 05:08	3,168	61,233,502	33,857,000	995,000	2,277,376
15	Mar 30, 2026 05:09	3,168	62,822,772	33,850,000	995,000	2,404,352
16	Mar 30, 2026 05:09	3,168	65,607,607	32,856,000	1,991,000	2,396,160
17	Mar 30, 2026 05:01	3,168	63,462,174	33,855,000	995,000	2,400,256
18	Mar 30, 2026 04:59	3,168	62,544,316	34,852,000	0	2,277,376
19	Mar 30, 2026 04:59	3,168	65,446,500	33,855,000	995,000	2,277,376
20	Mar 30, 2026 04:54	3,168	60,621,589	34,848,000	0	2,404,352
21	Mar 30, 2026 04:58	3,168	66,220,135	33,853,000	995,000	2,277,376
22	Mar 30, 2026 04:58	3,168	66,429,111	32,857,000	1,991,000	2,277,376
23	Mar 30, 2026 04:54	3,168	60,302,128	34,850,000	0	2,277,376
24	Mar 30, 2026 04:54	3,168	60,193,321	33,855,000	995,000	2,387,968
25	Mar 30, 2026 04:55	3,168	64,115,048	32,861,000	1,991,000	2,277,376
26	Mar 30, 2026 04:56	3,168	64,871,650	32,853,000	1,991,000	2,404,352
27	Mar 30, 2026 05:05	3,169	71,836,659	32,863,000	1,991,000	2,277,376
28	Mar 30, 2026 05:09	3,169	57,679,201	32,865,000	1,991,000	2,277,376
29	Mar 30, 2026 04:54	3,169	64,534,733	34,861,000	0	2,396,160
30	Mar 30, 2026 05:06	3,169	62,206,052	33,861,000	995,000	2,273,280
31	Mar 30, 2026 05:02	3,169	60,751,732	34,863,000	0	2,277,376
32	Mar 30, 2026 04:56	3,169	62,731,610	32,865,000	1,991,000	2,277,376
33	Mar 30, 2026 05:00	3,169	64,793,308	32,869,000	1,992,000	2,396,160
34	Mar 30, 2026 05:00	3,169	65,093,549	33,863,000	995,000	2,277,376
35	Mar 30, 2026 04:57	3,170	59,352,373	32,879,000	1,992,000	2,277,376
36	Mar 30, 2026 05:09	3,170	60,035,595	32,881,000	1,992,000	2,387,968
37	Mar 30, 2026 04:59	3,170	60,017,424	33,874,000	996,000	2,408,448
38	Mar 30, 2026 05:07	3,170	59,621,611	32,875,000	1,992,000	2,396,160
39	Mar 30, 2026 04:55	3,170	63,568,820	32,875,000	1,992,000	2,404,352
40	Mar 30, 2026 05:07	3,170	69,506,698	32,873,000	1,992,000	2,277,376
41	Mar 30, 2026 05:07	3,171	59,375,301	33,886,000	996,000	2,277,376
42	Mar 30, 2026 05:05	3,171	59,345,237	33,887,000	996,000	2,277,376
43	Mar 30, 2026 05:08	3,172	57,042,265	32,894,000	1,993,000	2,277,376
44	Mar 30, 2026 05:09	3,173	63,031,074	33,902,000	997,000	2,392,064
45	Mar 30, 2026 05:02	3,175	62,060,292	32,933,000	1,995,000	2,392,064
46	Mar 30, 2026 04:58	3,176	62,288,995	32,936,000	1,996,000	2,277,376
47	Mar 30, 2026 05:04	3,176	56,591,909	33,941,000	998,000	2,277,376
48	Mar 30, 2026 05:01	3,176	61,899,328	33,935,000	998,000	2,277,376
49	Mar 30, 2026 05:09	3,178	64,537,149	33,963,000	998,000	2,408,448
50	Mar 30, 2026 05:08	3,179	62,804,637	32,973,000	1,998,000	2,277,376
51	Mar 30, 2026 05:07	3,181	58,070,527	32,987,000	1,999,000	2,396,160
52	Mar 30, 2026 05:02	3,181	54,063,345	33,995,000	999,000	2,277,376
53	Mar 30, 2026 04:57	3,182	59,543,565	33,000,000	2,000,000	2,277,376
54	Mar 30, 2026 04:57	3,183	60,330,033	34,014,000	1,000,000	2,490,368
55	Mar 30, 2026 05:07	3,185	60,239,895	35,032,000	0	2,400,256
56	Mar 30, 2026 05:07	3,185	62,074,541	33,033,000	2,002,000	2,277,376
57	Mar 30, 2026 04:55	3,186	65,656,582	34,045,000	1,001,000	2,396,160
58	Mar 30, 2026 04:59	3,186	65,479,686	33,046,000	2,002,000	2,277,376
59	Mar 30, 2026 05:00	3,189	57,964,240	34,078,000	1,002,000	2,408,448
60	Mar 30, 2026 05:06	3,191	62,428,479	33,098,000	2,005,000	2,277,376

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