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 14:59	3,149	60,501,547	33,626,000	1,018,000	2,396,160
2	Mar 30, 2026 14:54	3,150	63,588,740	33,631,000	1,019,000	2,400,256
3	Mar 30, 2026 14:57	3,152	59,374,462	34,677,000	0	2,510,848
4	Mar 30, 2026 15:02	3,153	60,745,903	33,663,000	1,020,000	2,396,160
5	Mar 30, 2026 15:03	3,154	60,468,592	33,675,000	1,020,000	2,400,256
6	Mar 30, 2026 14:59	3,157	59,172,810	33,705,000	1,021,000	2,277,376
7	Mar 30, 2026 14:53	3,161	59,191,765	32,786,000	1,987,000	2,506,752
8	Mar 30, 2026 14:49	3,165	59,495,425	33,817,000	994,000	2,277,376
9	Mar 30, 2026 14:57	3,166	59,323,115	34,824,000	0	2,392,064
10	Mar 30, 2026 14:49	3,167	58,776,573	33,845,000	995,000	2,277,376
11	Mar 30, 2026 15:04	3,167	58,433,306	32,850,000	1,990,000	2,277,376
12	Mar 30, 2026 15:02	3,167	64,975,421	32,848,000	1,990,000	2,277,376
13	Mar 30, 2026 15:00	3,167	63,174,968	32,845,000	1,990,000	2,277,376
14	Mar 30, 2026 14:59	3,167	58,419,815	32,843,000	1,990,000	2,277,376
15	Mar 30, 2026 14:57	3,167	60,368,489	32,846,000	1,990,000	2,387,968
16	Mar 30, 2026 14:51	3,167	60,741,336	33,844,000	995,000	2,387,968
17	Mar 30, 2026 14:53	3,168	61,558,140	32,860,000	1,991,000	2,277,376
18	Mar 30, 2026 15:02	3,168	65,923,817	32,858,000	1,991,000	2,404,352
19	Mar 30, 2026 14:51	3,168	60,926,017	33,849,000	995,000	2,277,376
20	Mar 30, 2026 14:54	3,168	61,665,096	33,855,000	995,000	2,277,376
21	Mar 30, 2026 15:03	3,168	62,838,022	33,856,000	995,000	2,277,376
22	Mar 30, 2026 14:56	3,168	65,845,919	33,855,000	995,000	2,277,376
23	Mar 30, 2026 14:53	3,169	64,971,153	33,865,000	996,000	2,400,256
24	Mar 30, 2026 14:50	3,169	62,014,068	32,868,000	1,992,000	2,400,256
25	Mar 30, 2026 14:59	3,169	60,314,616	32,870,000	1,992,000	2,404,352
26	Mar 30, 2026 15:02	3,169	58,971,164	33,861,000	995,000	2,277,376
27	Mar 30, 2026 14:49	3,169	63,790,309	34,856,000	0	2,392,064
28	Mar 30, 2026 14:52	3,169	58,817,321	33,864,000	996,000	2,277,376
29	Mar 30, 2026 14:55	3,169	61,159,877	33,862,000	995,000	2,396,160
30	Mar 30, 2026 14:56	3,170	58,194,278	32,879,000	1,992,000	2,404,352
31	Mar 30, 2026 14:49	3,170	69,525,159	34,869,000	0	2,408,448
32	Mar 30, 2026 14:52	3,170	60,058,249	33,871,000	996,000	2,277,376
33	Mar 30, 2026 14:57	3,170	63,788,019	32,877,000	1,992,000	2,400,256
34	Mar 30, 2026 15:04	3,170	66,451,269	32,879,000	1,992,000	2,400,256
35	Mar 30, 2026 15:00	3,170	57,667,869	34,869,000	0	2,404,352
36	Mar 30, 2026 14:53	3,170	65,677,606	34,867,000	0	2,400,256
37	Mar 30, 2026 15:01	3,171	60,318,642	32,892,000	1,993,000	2,392,064
38	Mar 30, 2026 14:53	3,171	62,961,015	32,887,000	1,993,000	2,273,280
39	Mar 30, 2026 14:50	3,172	60,257,799	33,900,000	997,000	2,277,376
40	Mar 30, 2026 14:56	3,173	58,851,059	33,910,000	997,000	2,277,376
41	Mar 30, 2026 14:59	3,173	60,234,982	32,910,000	1,994,000	2,383,872
42	Mar 30, 2026 14:54	3,173	56,089,810	32,905,000	1,994,000	2,277,376
43	Mar 30, 2026 14:49	3,174	57,218,963	32,919,000	1,995,000	2,396,160
44	Mar 30, 2026 15:01	3,175	58,020,183	33,924,000	997,000	2,277,376
45	Mar 30, 2026 14:49	3,176	65,706,921	32,941,000	1,996,000	2,396,160
46	Mar 30, 2026 15:04	3,176	59,596,713	32,937,000	1,996,000	2,277,376
47	Mar 30, 2026 14:57	3,176	59,723,604	33,937,000	998,000	2,277,376
48	Mar 30, 2026 14:55	3,177	60,628,949	32,947,000	1,996,000	2,277,376
49	Mar 30, 2026 14:59	3,178	56,557,823	32,959,000	1,997,000	2,490,368
50	Mar 30, 2026 15:03	3,178	60,408,355	33,963,000	998,000	2,404,352
51	Mar 30, 2026 14:52	3,179	63,491,818	33,973,000	999,000	2,277,376
52	Mar 30, 2026 15:01	3,181	59,797,790	32,995,000	1,999,000	2,277,376
53	Mar 30, 2026 14:55	3,181	61,247,696	32,991,000	1,999,000	2,277,376
54	Mar 30, 2026 15:00	3,182	58,890,452	35,002,000	0	2,277,376
55	Mar 30, 2026 14:50	3,183	61,139,816	33,009,000	2,000,000	2,277,376
56	Mar 30, 2026 14:57	3,184	66,587,714	34,021,000	1,000,000	2,277,376
57	Mar 30, 2026 15:02	3,186	55,640,578	33,047,000	2,002,000	2,392,064
58	Mar 30, 2026 15:02	3,189	61,681,515	33,076,000	2,004,000	2,277,376
59	Mar 30, 2026 14:51	3,191	58,432,378	33,094,000	2,005,000	2,404,352
60	Mar 30, 2026 14:53	3,191	59,078,110	33,095,000	2,005,000	2,400,256

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