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 18:37	3,151	61,423,691	34,665,000	0	2,400,256
2	Mar 30, 2026 18:37	3,152	62,758,798	33,650,000	1,019,000	2,392,064
3	Mar 30, 2026 18:29	3,154	63,742,672	34,692,000	0	2,392,064
4	Mar 30, 2026 18:44	3,155	62,708,365	34,710,000	0	2,277,376
5	Mar 30, 2026 18:37	3,157	61,694,377	33,701,000	1,021,000	2,400,256
6	Mar 30, 2026 18:43	3,165	62,786,170	32,828,000	1,989,000	2,277,376
7	Mar 30, 2026 18:29	3,166	59,818,828	33,828,000	994,000	2,277,376
8	Mar 30, 2026 18:40	3,167	60,254,524	32,850,000	1,990,000	2,506,752
9	Mar 30, 2026 18:34	3,167	62,818,911	32,847,000	1,990,000	2,404,352
10	Mar 30, 2026 18:36	3,167	59,816,858	33,847,000	995,000	2,277,376
11	Mar 30, 2026 18:37	3,167	60,237,793	33,842,000	995,000	2,277,376
12	Mar 30, 2026 18:29	3,167	63,962,536	32,848,000	1,990,000	2,277,376
13	Mar 30, 2026 18:27	3,168	65,365,132	34,852,000	0	2,392,064
14	Mar 30, 2026 18:39	3,168	64,697,692	33,850,000	995,000	2,400,256
15	Mar 30, 2026 18:41	3,168	63,230,103	32,858,000	1,991,000	2,277,376
16	Mar 30, 2026 18:42	3,168	63,135,634	32,854,000	1,991,000	2,277,376
17	Mar 30, 2026 18:37	3,168	59,394,684	32,857,000	1,991,000	2,277,376
18	Mar 30, 2026 18:43	3,168	62,230,836	32,859,000	1,991,000	2,510,848
19	Mar 30, 2026 18:36	3,168	59,441,532	33,857,000	995,000	2,277,376
20	Mar 30, 2026 18:36	3,168	61,076,990	32,860,000	1,991,000	2,404,352
21	Mar 30, 2026 18:43	3,168	63,444,392	32,860,000	1,991,000	2,396,160
22	Mar 30, 2026 18:34	3,168	58,763,772	33,854,000	995,000	2,392,064
23	Mar 30, 2026 18:44	3,168	64,902,619	32,858,000	1,991,000	2,277,376
24	Mar 30, 2026 18:27	3,168	62,261,670	33,853,000	995,000	2,404,352
25	Mar 30, 2026 18:29	3,168	60,793,723	32,852,000	1,991,000	2,482,176
26	Mar 30, 2026 18:32	3,168	61,648,766	32,854,000	1,991,000	2,400,256
27	Mar 30, 2026 18:29	3,169	60,302,595	33,867,000	996,000	2,277,376
28	Mar 30, 2026 18:33	3,169	61,150,494	33,861,000	995,000	2,383,872
29	Mar 30, 2026 18:27	3,169	60,590,663	33,868,000	996,000	2,277,376
30	Mar 30, 2026 18:30	3,169	60,988,090	32,868,000	1,992,000	2,277,376
31	Mar 30, 2026 18:44	3,169	66,473,185	32,870,000	1,992,000	2,404,352
32	Mar 30, 2026 18:39	3,169	66,643,442	33,859,000	995,000	2,392,064
33	Mar 30, 2026 18:39	3,170	58,485,583	33,845,000	1,025,000	2,400,256
34	Mar 30, 2026 18:29	3,170	64,544,332	34,871,000	0	2,400,256
35	Mar 30, 2026 18:31	3,170	61,971,532	32,877,000	1,992,000	2,404,352
36	Mar 30, 2026 18:37	3,170	61,725,757	32,875,000	1,992,000	2,404,352
37	Mar 30, 2026 18:32	3,170	59,482,808	32,874,000	1,992,000	2,400,256
38	Mar 30, 2026 18:33	3,170	58,751,181	32,873,000	1,992,000	2,396,160
39	Mar 30, 2026 18:44	3,171	56,886,708	32,893,000	1,993,000	2,396,160
40	Mar 30, 2026 18:30	3,172	59,209,423	32,895,000	1,993,000	2,273,280
41	Mar 30, 2026 18:42	3,172	59,047,806	32,902,000	1,994,000	2,277,376
42	Mar 30, 2026 18:31	3,173	58,604,256	32,907,000	1,994,000	2,482,176
43	Mar 30, 2026 18:40	3,173	59,146,856	33,906,000	997,000	2,400,256
44	Mar 30, 2026 18:32	3,174	58,846,555	33,919,000	997,000	2,277,376
45	Mar 30, 2026 18:34	3,174	57,319,698	32,919,000	1,995,000	2,277,376
46	Mar 30, 2026 18:34	3,175	63,947,557	32,933,000	1,995,000	2,277,376
47	Mar 30, 2026 18:41	3,176	57,140,809	32,940,000	1,996,000	2,400,256
48	Mar 30, 2026 18:30	3,177	62,155,798	33,949,000	998,000	2,277,376
49	Mar 30, 2026 18:40	3,177	60,669,624	33,944,000	998,000	2,277,376
50	Mar 30, 2026 18:33	3,178	58,243,638	32,965,000	1,997,000	2,277,376
51	Mar 30, 2026 18:34	3,179	58,173,771	33,967,000	999,000	2,396,160
52	Mar 30, 2026 18:44	3,180	58,097,891	32,982,000	1,998,000	2,277,376
53	Mar 30, 2026 18:44	3,181	58,235,741	33,991,000	999,000	2,273,280
54	Mar 30, 2026 18:31	3,183	56,816,623	33,017,000	2,001,000	2,498,560
55	Mar 30, 2026 18:41	3,184	58,538,131	33,019,000	2,001,000	2,404,352
56	Mar 30, 2026 18:34	3,186	58,020,406	33,042,000	2,002,000	2,277,376
57	Mar 30, 2026 18:42	3,189	58,039,275	34,079,000	1,002,000	2,490,368

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