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 14:03	3,145	65,274,030	33,576,000	1,017,000	2,277,376
2	Mar 30, 2026 14:04	3,148	64,282,924	34,629,000	0	2,400,256
3	Mar 30, 2026 14:06	3,149	58,955,219	33,626,000	1,018,000	2,404,352
4	Mar 30, 2026 14:06	3,150	58,504,597	33,628,000	1,019,000	2,277,376
5	Mar 30, 2026 14:07	3,150	63,872,381	34,650,000	0	2,396,160
6	Mar 30, 2026 14:07	3,150	65,486,688	33,627,000	1,019,000	2,277,376
7	Mar 30, 2026 14:05	3,151	61,236,641	34,663,000	0	2,519,040
8	Mar 30, 2026 14:00	3,151	62,530,712	33,644,000	1,019,000	2,277,376
9	Mar 30, 2026 14:10	3,152	59,260,652	33,652,000	1,019,000	2,277,376
10	Mar 30, 2026 14:08	3,152	68,167,700	33,656,000	1,019,000	2,277,376
11	Mar 30, 2026 14:07	3,152	67,713,596	33,656,000	1,019,000	2,277,376
12	Mar 30, 2026 14:02	3,153	68,873,656	33,665,000	1,020,000	2,400,256
13	Mar 30, 2026 14:09	3,154	60,547,995	33,678,000	1,020,000	2,277,376
14	Mar 30, 2026 14:07	3,154	66,142,836	34,694,000	0	2,392,064
15	Mar 30, 2026 14:02	3,155	61,387,255	34,709,000	0	2,277,376
16	Mar 30, 2026 13:58	3,156	63,581,686	33,692,000	1,020,000	2,400,256
17	Mar 30, 2026 14:09	3,167	65,938,886	33,842,000	995,000	2,277,376
18	Mar 30, 2026 13:58	3,167	59,820,813	33,845,000	995,000	2,277,376
19	Mar 30, 2026 14:05	3,167	59,433,487	33,837,000	995,000	2,277,376
20	Mar 30, 2026 14:02	3,167	61,409,585	33,839,000	995,000	2,490,368
21	Mar 30, 2026 14:04	3,168	59,954,028	32,859,000	1,991,000	2,273,280
22	Mar 30, 2026 14:05	3,168	62,604,726	33,856,000	995,000	2,396,160
23	Mar 30, 2026 14:01	3,168	62,552,038	33,858,000	995,000	2,396,160
24	Mar 30, 2026 14:01	3,168	59,636,172	32,861,000	1,991,000	2,510,848
25	Mar 30, 2026 14:07	3,168	62,128,845	33,850,000	995,000	2,277,376
26	Mar 30, 2026 14:08	3,168	67,628,716	33,849,000	995,000	2,277,376
27	Mar 30, 2026 14:10	3,168	62,099,692	33,852,000	995,000	2,277,376
28	Mar 30, 2026 13:57	3,168	60,776,127	34,846,000	0	2,387,968
29	Mar 30, 2026 14:02	3,169	64,188,528	32,870,000	1,992,000	2,277,376
30	Mar 30, 2026 13:58	3,169	59,997,754	34,864,000	0	2,277,376
31	Mar 30, 2026 14:04	3,169	59,989,393	32,865,000	1,991,000	2,482,176
32	Mar 30, 2026 13:58	3,170	67,461,670	34,865,000	0	2,277,376
33	Mar 30, 2026 14:10	3,170	56,145,748	33,848,000	1,025,000	2,400,256
34	Mar 30, 2026 13:57	3,171	59,795,929	33,882,000	996,000	2,277,376
35	Mar 30, 2026 14:03	3,171	63,946,274	34,876,000	0	2,277,376
36	Mar 30, 2026 14:02	3,171	59,577,930	33,884,000	996,000	2,408,448
37	Mar 30, 2026 14:06	3,172	57,562,377	32,895,000	1,993,000	2,277,376
38	Mar 30, 2026 14:02	3,172	61,298,949	33,899,000	997,000	2,277,376
39	Mar 30, 2026 13:58	3,172	55,111,216	33,895,000	996,000	2,400,256
40	Mar 30, 2026 13:59	3,172	56,409,565	33,899,000	997,000	2,277,376
41	Mar 30, 2026 13:59	3,172	62,276,465	32,895,000	1,993,000	2,408,448
42	Mar 30, 2026 14:03	3,173	60,540,401	33,872,000	1,026,000	2,277,376
43	Mar 30, 2026 14:01	3,173	58,987,376	32,905,000	1,994,000	2,404,352
44	Mar 30, 2026 14:09	3,173	62,834,718	32,910,000	1,994,000	2,387,968
45	Mar 30, 2026 14:05	3,174	55,889,960	31,922,000	2,992,000	2,273,280
46	Mar 30, 2026 13:57	3,174	61,308,316	33,916,000	997,000	2,273,280
47	Mar 30, 2026 14:05	3,175	62,657,604	33,923,000	997,000	2,408,448
48	Mar 30, 2026 14:11	3,175	59,047,446	33,924,000	997,000	2,277,376
49	Mar 30, 2026 14:11	3,176	60,212,896	33,942,000	998,000	2,396,160
50	Mar 30, 2026 14:10	3,176	56,890,472	33,936,000	998,000	2,387,968
51	Mar 30, 2026 13:59	3,176	61,996,313	33,935,000	998,000	2,277,376
52	Mar 30, 2026 14:07	3,176	57,715,810	32,945,000	1,996,000	2,400,256
53	Mar 30, 2026 14:10	3,177	60,833,049	32,955,000	1,997,000	2,400,256
54	Mar 30, 2026 14:00	3,178	59,121,004	32,961,000	1,997,000	2,396,160
55	Mar 30, 2026 14:00	3,179	58,384,067	32,969,000	1,998,000	2,277,376
56	Mar 30, 2026 13:58	3,180	58,347,583	33,984,000	999,000	2,400,256
57	Mar 30, 2026 14:08	3,181	63,103,591	33,987,000	999,000	2,277,376
58	Mar 30, 2026 14:10	3,184	63,324,244	33,018,000	2,001,000	2,277,376
59	Mar 30, 2026 14:05	3,185	58,046,775	33,034,000	2,002,000	2,404,352
60	Mar 30, 2026 14:11	3,187	59,526,671	34,060,000	1,001,000	2,396,160

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