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 07:22	3,148	59,452,924	34,629,000	0	2,396,160
2	Mar 30, 2026 07:10	3,151	64,109,305	33,645,000	1,019,000	2,400,256
3	Mar 30, 2026 07:16	3,153	64,455,628	34,685,000	0	2,277,376
4	Mar 30, 2026 07:22	3,153	63,699,344	34,687,000	0	2,404,352
5	Mar 30, 2026 07:16	3,154	65,559,217	33,673,000	1,020,000	2,392,064
6	Mar 30, 2026 07:22	3,154	59,749,092	34,699,000	0	2,277,376
7	Mar 30, 2026 07:21	3,154	66,311,821	33,673,000	1,020,000	2,392,064
8	Mar 30, 2026 07:16	3,155	65,029,614	33,688,000	1,020,000	2,396,160
9	Mar 30, 2026 07:20	3,155	59,665,101	33,686,000	1,020,000	2,387,968
10	Mar 30, 2026 07:11	3,156	62,527,096	33,697,000	1,021,000	2,404,352
11	Mar 30, 2026 07:14	3,157	63,345,970	33,711,000	1,021,000	2,277,376
12	Mar 30, 2026 07:11	3,166	60,464,277	32,840,000	1,990,000	2,277,376
13	Mar 30, 2026 07:19	3,166	63,933,047	33,834,000	995,000	2,400,256
14	Mar 30, 2026 07:09	3,166	64,848,710	33,831,000	995,000	2,277,376
15	Mar 30, 2026 07:18	3,166	63,769,882	34,831,000	0	2,277,376
16	Mar 30, 2026 07:11	3,167	66,977,465	33,846,000	995,000	2,277,376
17	Mar 30, 2026 07:20	3,167	64,907,685	33,845,000	995,000	2,400,256
18	Mar 30, 2026 07:11	3,167	66,071,512	34,832,000	0	2,277,376
19	Mar 30, 2026 07:09	3,167	61,015,475	32,849,000	1,990,000	2,400,256
20	Mar 30, 2026 07:18	3,167	60,522,261	34,838,000	0	2,277,376
21	Mar 30, 2026 07:18	3,167	61,299,132	33,845,000	995,000	2,400,256
22	Mar 30, 2026 07:21	3,168	61,600,647	34,853,000	0	2,281,472
23	Mar 30, 2026 07:14	3,168	57,273,881	32,855,000	1,991,000	2,400,256
24	Mar 30, 2026 07:22	3,168	61,537,929	32,853,000	1,991,000	2,400,256
25	Mar 30, 2026 07:20	3,169	63,234,263	32,863,000	1,991,000	2,277,376
26	Mar 30, 2026 07:16	3,169	60,988,212	34,857,000	0	2,277,376
27	Mar 30, 2026 07:18	3,169	62,245,364	32,863,000	1,991,000	2,277,376
28	Mar 30, 2026 07:15	3,169	66,410,426	33,861,000	995,000	2,277,376
29	Mar 30, 2026 07:23	3,169	63,998,672	34,856,000	0	2,408,448
30	Mar 30, 2026 07:09	3,169	60,520,918	32,863,000	1,991,000	2,387,968
31	Mar 30, 2026 07:17	3,170	59,238,135	33,869,000	996,000	2,277,376
32	Mar 30, 2026 07:18	3,170	60,071,896	33,869,000	996,000	2,392,064
33	Mar 30, 2026 07:22	3,170	63,219,354	32,876,000	1,992,000	2,396,160
34	Mar 30, 2026 07:12	3,170	66,993,531	33,870,000	996,000	2,277,376
35	Mar 30, 2026 07:17	3,171	60,579,391	32,887,000	1,993,000	2,277,376
36	Mar 30, 2026 07:11	3,171	61,625,441	32,888,000	1,993,000	2,277,376
37	Mar 30, 2026 07:12	3,171	59,357,922	33,889,000	996,000	2,277,376
38	Mar 30, 2026 07:20	3,175	62,314,531	32,929,000	1,995,000	2,396,160
39	Mar 30, 2026 07:09	3,175	62,839,096	33,932,000	998,000	2,277,376
40	Mar 30, 2026 07:10	3,175	60,034,406	33,929,000	997,000	2,277,376
41	Mar 30, 2026 07:20	3,175	63,212,635	33,932,000	998,000	2,277,376
42	Mar 30, 2026 07:23	3,177	57,863,924	32,946,000	1,996,000	2,277,376
43	Mar 30, 2026 07:19	3,177	55,771,753	32,946,000	1,996,000	2,404,352
44	Mar 30, 2026 07:17	3,177	60,962,973	32,946,000	1,996,000	2,392,064
45	Mar 30, 2026 07:15	3,177	60,561,150	33,953,000	998,000	2,404,352
46	Mar 30, 2026 07:09	3,177	54,325,048	32,954,000	1,997,000	2,277,376
47	Mar 30, 2026 07:16	3,178	63,015,176	33,964,000	998,000	2,396,160
48	Mar 30, 2026 07:18	3,178	57,830,787	32,959,000	1,997,000	2,277,376
49	Mar 30, 2026 07:15	3,178	57,487,275	33,964,000	998,000	2,277,376
50	Mar 30, 2026 07:21	3,179	56,734,369	32,967,000	1,998,000	2,277,376
51	Mar 30, 2026 07:23	3,179	60,310,578	32,972,000	1,998,000	2,387,968
52	Mar 30, 2026 07:22	3,180	61,400,889	32,978,000	1,998,000	2,277,376
53	Mar 30, 2026 07:20	3,181	58,139,366	33,997,000	999,000	2,510,848
54	Mar 30, 2026 07:10	3,182	57,845,546	33,006,000	2,000,000	2,392,064
55	Mar 30, 2026 07:16	3,182	61,491,509	33,004,000	2,000,000	2,396,160
56	Mar 30, 2026 07:14	3,184	58,597,921	33,019,000	2,001,000	2,273,280
57	Mar 30, 2026 07:19	3,186	58,283,630	35,050,000	0	2,277,376
58	Mar 30, 2026 07:11	3,186	55,806,743	33,039,000	2,002,000	2,392,064
59	Mar 30, 2026 07:09	3,187	59,401,951	34,060,000	1,001,000	2,277,376
60	Mar 30, 2026 07:12	3,190	63,383,261	33,081,000	2,004,000	2,392,064

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