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 08:15	3,150	59,904,684	33,636,000	1,019,000	2,277,376
2	Mar 30, 2026 08:17	3,150	65,564,031	34,650,000	0	2,277,376
3	Mar 30, 2026 08:14	3,151	58,435,598	34,665,000	0	2,277,376
4	Mar 30, 2026 08:13	3,151	63,597,650	34,661,000	0	2,392,064
5	Mar 30, 2026 08:12	3,152	66,650,569	33,650,000	1,019,000	2,277,376
6	Mar 30, 2026 08:12	3,152	61,683,817	34,672,000	0	2,277,376
7	Mar 30, 2026 08:23	3,152	60,748,791	34,668,000	0	2,277,376
8	Mar 30, 2026 08:21	3,153	59,159,214	33,659,000	1,019,000	2,400,256
9	Mar 30, 2026 08:13	3,154	60,322,597	34,689,000	0	2,277,376
10	Mar 30, 2026 08:12	3,156	61,115,777	34,716,000	0	2,277,376
11	Mar 30, 2026 08:13	3,164	64,350,144	32,819,000	1,989,000	2,408,448
12	Mar 30, 2026 08:14	3,165	61,528,572	32,825,000	1,989,000	2,277,376
13	Mar 30, 2026 08:14	3,166	64,927,876	32,841,000	1,990,000	2,392,064
14	Mar 30, 2026 08:18	3,167	60,199,788	32,851,000	1,990,000	2,277,376
15	Mar 30, 2026 08:21	3,167	63,910,609	33,846,000	995,000	2,396,160
16	Mar 30, 2026 08:18	3,167	62,989,673	34,840,000	0	2,277,376
17	Mar 30, 2026 08:18	3,167	62,551,605	33,838,000	995,000	2,392,064
18	Mar 30, 2026 08:11	3,167	60,330,221	33,840,000	995,000	2,277,376
19	Mar 30, 2026 08:11	3,167	60,670,081	33,839,000	995,000	2,277,376
20	Mar 30, 2026 08:19	3,168	62,173,727	32,853,000	1,991,000	2,277,376
21	Mar 30, 2026 08:11	3,168	61,139,502	32,855,000	1,991,000	2,400,256
22	Mar 30, 2026 08:15	3,168	60,798,182	33,854,000	995,000	2,510,848
23	Mar 30, 2026 08:16	3,168	62,596,254	32,859,000	1,991,000	2,392,064
24	Mar 30, 2026 08:16	3,168	59,940,137	33,848,000	995,000	2,277,376
25	Mar 30, 2026 08:18	3,169	65,073,347	33,862,000	995,000	2,277,376
26	Mar 30, 2026 08:19	3,169	67,538,586	32,866,000	1,991,000	2,277,376
27	Mar 30, 2026 08:20	3,169	62,598,755	33,865,000	996,000	2,396,160
28	Mar 30, 2026 08:14	3,169	61,148,556	32,863,000	1,991,000	2,277,376
29	Mar 30, 2026 08:23	3,169	63,284,085	33,860,000	995,000	2,396,160
30	Mar 30, 2026 08:16	3,170	63,330,959	32,873,000	1,992,000	2,277,376
31	Mar 30, 2026 08:18	3,170	59,700,092	33,878,000	996,000	2,392,064
32	Mar 30, 2026 08:22	3,170	64,662,134	34,866,000	0	2,400,256
33	Mar 30, 2026 08:17	3,170	59,381,677	33,871,000	996,000	2,400,256
34	Mar 30, 2026 08:22	3,170	65,023,153	33,877,000	996,000	2,396,160
35	Mar 30, 2026 08:11	3,170	56,765,077	32,874,000	1,992,000	2,404,352
36	Mar 30, 2026 08:23	3,171	58,513,494	32,889,000	1,993,000	2,277,376
37	Mar 30, 2026 08:13	3,171	57,000,196	32,891,000	1,993,000	2,277,376
38	Mar 30, 2026 08:17	3,172	60,767,560	33,896,000	996,000	2,277,376
39	Mar 30, 2026 08:20	3,173	61,773,913	33,909,000	997,000	2,392,064
40	Mar 30, 2026 08:20	3,174	60,317,799	32,924,000	1,995,000	2,392,064
41	Mar 30, 2026 08:11	3,175	57,168,799	33,924,000	997,000	2,277,376
42	Mar 30, 2026 08:20	3,177	56,598,150	33,950,000	998,000	2,277,376
43	Mar 30, 2026 08:20	3,180	58,031,986	32,986,000	1,999,000	2,277,376
44	Mar 30, 2026 08:20	3,181	62,363,511	33,992,000	999,000	2,277,376
45	Mar 30, 2026 08:14	3,181	60,834,573	32,991,000	1,999,000	2,277,376
46	Mar 30, 2026 08:11	3,181	58,473,112	34,991,000	0	2,392,064
47	Mar 30, 2026 08:21	3,182	58,994,854	34,005,000	1,000,000	2,277,376
48	Mar 30, 2026 08:18	3,182	57,543,669	33,001,000	2,000,000	2,277,376
49	Mar 30, 2026 08:15	3,183	56,859,227	33,015,000	2,000,000	2,277,376
50	Mar 30, 2026 08:13	3,183	58,806,140	33,017,000	2,001,000	2,277,376
51	Mar 30, 2026 08:19	3,184	56,568,523	33,023,000	2,001,000	2,392,064
52	Mar 30, 2026 08:16	3,184	59,062,305	34,022,000	1,000,000	2,277,376
53	Mar 30, 2026 08:14	3,185	60,335,625	33,029,000	2,001,000	2,416,640
54	Mar 30, 2026 08:22	3,186	58,695,120	33,041,000	2,002,000	2,277,376
55	Mar 30, 2026 08:16	3,187	60,075,711	34,060,000	1,001,000	2,404,352
56	Mar 30, 2026 08:16	3,187	61,897,121	33,054,000	2,003,000	2,490,368
57	Mar 30, 2026 08:13	3,195	62,181,839	33,136,000	2,008,000	2,277,376

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