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 21:06	3,145	56,538,267	33,573,000	1,017,000	2,408,448
2	Mar 30, 2026 21:00	3,145	60,599,346	34,594,000	0	2,396,160
3	Mar 30, 2026 20:59	3,146	59,755,191	33,589,000	1,017,000	2,277,376
4	Mar 30, 2026 21:10	3,151	63,624,783	34,662,000	0	2,277,376
5	Mar 30, 2026 21:05	3,152	65,243,306	33,656,000	1,019,000	2,396,160
6	Mar 30, 2026 20:57	3,153	60,830,742	34,678,000	0	2,400,256
7	Mar 30, 2026 20:55	3,154	65,115,193	34,693,000	0	2,277,376
8	Mar 30, 2026 20:55	3,154	65,746,494	33,675,000	1,020,000	2,277,376
9	Mar 30, 2026 21:04	3,154	63,836,382	33,679,000	1,020,000	2,396,160
10	Mar 30, 2026 20:55	3,155	60,192,897	34,704,000	0	2,281,472
11	Mar 30, 2026 21:00	3,155	64,177,778	33,685,000	1,020,000	2,277,376
12	Mar 30, 2026 21:07	3,155	61,850,796	33,684,000	1,020,000	2,400,256
13	Mar 30, 2026 20:54	3,156	60,175,716	34,721,000	0	2,277,376
14	Mar 30, 2026 20:58	3,157	61,179,063	33,707,000	1,021,000	2,400,256
15	Mar 30, 2026 21:09	3,165	62,922,664	34,814,000	0	2,408,448
16	Mar 30, 2026 20:56	3,166	60,912,661	32,833,000	1,989,000	2,404,352
17	Mar 30, 2026 21:02	3,166	63,225,651	32,840,000	1,990,000	2,277,376
18	Mar 30, 2026 21:08	3,167	65,305,373	33,844,000	995,000	2,277,376
19	Mar 30, 2026 20:58	3,167	60,703,179	33,844,000	995,000	2,400,256
20	Mar 30, 2026 20:54	3,167	62,947,138	32,848,000	1,990,000	2,277,376
21	Mar 30, 2026 20:59	3,168	59,141,090	32,857,000	1,991,000	2,519,040
22	Mar 30, 2026 20:57	3,168	61,851,047	34,853,000	0	2,400,256
23	Mar 30, 2026 20:57	3,168	62,824,432	33,856,000	995,000	2,400,256
24	Mar 30, 2026 20:56	3,168	61,879,980	32,858,000	1,991,000	2,396,160
25	Mar 30, 2026 21:07	3,168	60,960,440	33,850,000	995,000	2,277,376
26	Mar 30, 2026 20:56	3,168	63,037,746	33,854,000	995,000	2,277,376
27	Mar 30, 2026 21:09	3,168	60,814,533	32,858,000	1,991,000	2,277,376
28	Mar 30, 2026 21:11	3,168	61,430,927	33,848,000	995,000	2,277,376
29	Mar 30, 2026 21:03	3,168	59,508,207	34,845,000	0	2,396,160
30	Mar 30, 2026 21:02	3,168	61,234,673	33,853,000	995,000	2,277,376
31	Mar 30, 2026 21:08	3,168	60,495,302	32,857,000	1,991,000	2,277,376
32	Mar 30, 2026 20:53	3,169	61,407,284	32,863,000	1,991,000	2,277,376
33	Mar 30, 2026 21:05	3,169	61,026,213	34,856,000	0	2,404,352
34	Mar 30, 2026 21:09	3,169	64,870,375	33,861,000	995,000	2,277,376
35	Mar 30, 2026 21:00	3,169	64,914,183	33,866,000	996,000	2,277,376
36	Mar 30, 2026 20:59	3,169	59,298,091	32,869,000	1,992,000	2,277,376
37	Mar 30, 2026 20:58	3,169	59,678,957	33,862,000	995,000	2,396,160
38	Mar 30, 2026 21:03	3,170	65,143,525	32,874,000	1,992,000	2,490,368
39	Mar 30, 2026 21:01	3,170	61,310,568	33,869,000	996,000	2,277,376
40	Mar 30, 2026 21:11	3,170	64,101,885	33,870,000	996,000	2,277,376
41	Mar 30, 2026 21:05	3,170	69,342,862	32,873,000	1,992,000	2,277,376
42	Mar 30, 2026 21:01	3,171	61,810,733	33,888,000	996,000	2,396,160
43	Mar 30, 2026 21:06	3,171	60,076,672	32,886,000	1,993,000	2,396,160
44	Mar 30, 2026 20:53	3,172	62,095,529	33,900,000	997,000	2,404,352
45	Mar 30, 2026 21:04	3,172	58,785,538	32,898,000	1,993,000	2,277,376
46	Mar 30, 2026 21:08	3,173	58,289,327	33,882,000	1,026,000	2,277,376
47	Mar 30, 2026 21:06	3,174	61,459,157	33,913,000	997,000	2,277,376
48	Mar 30, 2026 21:07	3,174	59,527,123	32,919,000	1,995,000	2,277,376
49	Mar 30, 2026 21:10	3,174	58,591,064	33,917,000	997,000	2,273,280
50	Mar 30, 2026 21:01	3,176	56,380,672	33,943,000	998,000	2,277,376
51	Mar 30, 2026 21:00	3,176	55,443,916	32,942,000	1,996,000	2,277,376
52	Mar 30, 2026 21:11	3,177	56,974,428	32,950,000	1,997,000	2,277,376
53	Mar 30, 2026 20:54	3,179	58,508,370	32,967,000	1,998,000	2,277,376
54	Mar 30, 2026 21:10	3,180	56,972,843	32,979,000	1,998,000	2,396,160
55	Mar 30, 2026 21:02	3,181	61,196,827	32,993,000	1,999,000	2,277,376
56	Mar 30, 2026 21:00	3,181	56,753,006	33,994,000	999,000	2,404,352
57	Mar 30, 2026 21:00	3,185	57,829,398	33,035,000	2,002,000	2,482,176
58	Mar 30, 2026 20:53	3,186	58,821,537	34,046,000	1,001,000	2,396,160
59	Mar 30, 2026 21:03	3,187	57,689,845	34,059,000	1,001,000	2,482,176
60	Mar 30, 2026 21:04	3,191	56,833,135	34,094,000	1,002,000	2,277,376

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