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 15:23	3,145	67,587,745	33,579,000	1,017,000	2,277,376
2	Mar 30, 2026 15:18	3,148	61,414,409	34,630,000	0	2,277,376
3	Mar 30, 2026 15:19	3,149	66,228,409	33,621,000	1,018,000	2,387,968
4	Mar 30, 2026 15:31	3,150	62,585,402	33,631,000	1,019,000	2,277,376
5	Mar 30, 2026 15:23	3,150	61,688,570	33,636,000	1,019,000	2,404,352
6	Mar 30, 2026 15:28	3,151	63,332,675	33,644,000	1,019,000	2,400,256
7	Mar 30, 2026 15:27	3,154	59,793,319	34,692,000	0	2,396,160
8	Mar 30, 2026 15:31	3,155	58,789,240	34,710,000	0	2,396,160
9	Mar 30, 2026 15:19	3,155	61,080,194	34,700,000	0	2,400,256
10	Mar 30, 2026 15:22	3,156	61,588,665	34,714,000	0	2,277,376
11	Mar 30, 2026 15:19	3,157	61,590,661	34,725,000	0	2,277,376
12	Mar 30, 2026 15:22	3,166	62,902,711	33,830,000	995,000	2,387,968
13	Mar 30, 2026 15:26	3,167	66,475,908	33,842,000	995,000	2,392,064
14	Mar 30, 2026 15:24	3,167	64,002,682	33,844,000	995,000	2,277,376
15	Mar 30, 2026 15:24	3,167	59,834,834	32,842,000	1,990,000	2,277,376
16	Mar 30, 2026 15:28	3,167	60,429,367	33,843,000	995,000	2,277,376
17	Mar 30, 2026 15:29	3,167	57,009,939	32,842,000	1,990,000	2,519,040
18	Mar 30, 2026 15:25	3,168	61,962,621	34,852,000	0	2,396,160
19	Mar 30, 2026 15:26	3,168	63,223,307	33,857,000	995,000	2,277,376
20	Mar 30, 2026 15:25	3,168	62,613,847	33,849,000	995,000	2,277,376
21	Mar 30, 2026 15:31	3,168	57,621,955	33,856,000	995,000	2,400,256
22	Mar 30, 2026 15:16	3,168	66,307,736	34,843,000	0	2,277,376
23	Mar 30, 2026 15:16	3,168	66,921,477	33,849,000	995,000	2,396,160
24	Mar 30, 2026 15:16	3,168	65,272,795	32,862,000	1,991,000	2,277,376
25	Mar 30, 2026 15:18	3,168	59,970,793	33,854,000	995,000	2,400,256
26	Mar 30, 2026 15:28	3,169	64,237,475	33,868,000	996,000	2,277,376
27	Mar 30, 2026 15:25	3,169	57,907,996	32,865,000	1,991,000	2,277,376
28	Mar 30, 2026 15:19	3,169	62,076,943	34,859,000	0	2,277,376
29	Mar 30, 2026 15:22	3,170	62,027,595	33,872,000	996,000	2,396,160
30	Mar 30, 2026 15:24	3,170	57,433,310	33,879,000	996,000	2,277,376
31	Mar 30, 2026 15:18	3,170	57,309,511	33,876,000	996,000	2,510,848
32	Mar 30, 2026 15:30	3,171	67,320,489	33,886,000	996,000	2,277,376
33	Mar 30, 2026 15:21	3,171	65,264,514	32,888,000	1,993,000	2,273,280
34	Mar 30, 2026 15:28	3,172	61,957,117	33,892,000	996,000	2,392,064
35	Mar 30, 2026 15:20	3,172	57,546,287	32,899,000	1,993,000	2,404,352
36	Mar 30, 2026 15:25	3,172	59,729,869	32,903,000	1,994,000	2,277,376
37	Mar 30, 2026 15:15	3,173	59,448,579	33,904,000	997,000	2,400,256
38	Mar 30, 2026 15:22	3,173	64,249,066	33,907,000	997,000	2,408,448
39	Mar 30, 2026 15:22	3,174	57,272,758	33,918,000	997,000	2,408,448
40	Mar 30, 2026 15:20	3,174	56,863,841	33,913,000	997,000	2,277,376
41	Mar 30, 2026 15:27	3,174	64,207,047	32,916,000	1,994,000	2,404,352
42	Mar 30, 2026 15:15	3,175	58,002,223	34,930,000	0	2,412,544
43	Mar 30, 2026 15:15	3,176	57,268,377	33,935,000	998,000	2,277,376
44	Mar 30, 2026 15:28	3,176	63,614,993	33,938,000	998,000	2,277,376
45	Mar 30, 2026 15:20	3,176	58,328,875	33,935,000	998,000	2,400,256
46	Mar 30, 2026 15:22	3,176	55,289,252	33,940,000	998,000	2,510,848
47	Mar 30, 2026 15:29	3,177	57,461,017	33,946,000	998,000	2,277,376
48	Mar 30, 2026 15:29	3,178	57,904,385	33,961,000	998,000	2,502,656
49	Mar 30, 2026 15:28	3,179	57,018,419	33,967,000	999,000	2,396,160
50	Mar 30, 2026 15:26	3,182	60,582,916	34,000,000	1,000,000	2,277,376
51	Mar 30, 2026 15:23	3,183	60,609,400	33,012,000	2,000,000	2,392,064
52	Mar 30, 2026 15:19	3,183	59,604,463	33,016,000	2,000,000	2,277,376
53	Mar 30, 2026 15:30	3,184	59,670,056	33,019,000	2,001,000	2,277,376
54	Mar 30, 2026 15:25	3,185	56,085,933	33,031,000	2,001,000	2,502,656
55	Mar 30, 2026 15:21	3,187	56,412,449	33,051,000	2,003,000	2,277,376
56	Mar 30, 2026 15:30	3,187	58,567,965	33,054,000	2,003,000	2,400,256
57	Mar 30, 2026 15:25	3,187	66,284,985	34,057,000	1,001,000	2,400,256
58	Mar 30, 2026 15:27	3,188	61,955,379	34,070,000	1,002,000	2,396,160
59	Mar 30, 2026 15:21	3,188	55,854,993	33,067,000	2,004,000	2,396,160
60	Mar 30, 2026 15:19	3,190	60,225,868	33,084,000	2,005,000	2,277,376

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