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 19:05	3,148	60,093,743	34,629,000	0	2,277,376
2	Mar 30, 2026 19:16	3,150	61,873,312	33,634,000	1,019,000	2,277,376
3	Mar 30, 2026 19:07	3,150	64,012,218	34,646,000	0	2,277,376
4	Mar 30, 2026 19:09	3,151	64,250,273	33,640,000	1,019,000	2,277,376
5	Mar 30, 2026 18:59	3,152	62,521,563	34,670,000	0	2,400,256
6	Mar 30, 2026 19:06	3,152	68,405,348	34,677,000	0	2,392,064
7	Mar 30, 2026 19:06	3,152	63,555,216	33,652,000	1,019,000	2,367,488
8	Mar 30, 2026 19:08	3,154	59,301,520	32,708,000	1,982,000	2,277,376
9	Mar 30, 2026 19:07	3,154	60,491,483	34,689,000	0	2,400,256
10	Mar 30, 2026 19:11	3,154	61,788,040	33,676,000	1,020,000	2,277,376
11	Mar 30, 2026 19:03	3,155	60,932,307	34,704,000	0	2,277,376
12	Mar 30, 2026 18:56	3,156	60,798,699	33,695,000	1,021,000	2,277,376
13	Mar 30, 2026 19:09	3,156	64,274,273	34,712,000	0	2,277,376
14	Mar 30, 2026 19:15	3,156	61,208,247	33,692,000	1,020,000	2,396,160
15	Mar 30, 2026 19:11	3,166	62,504,138	32,838,000	1,990,000	2,277,376
16	Mar 30, 2026 19:01	3,166	60,064,997	33,828,000	994,000	2,277,376
17	Mar 30, 2026 19:12	3,167	67,640,193	32,850,000	1,990,000	2,277,376
18	Mar 30, 2026 19:15	3,167	61,522,010	32,847,000	1,990,000	2,392,064
19	Mar 30, 2026 19:05	3,167	60,265,391	33,817,000	1,024,000	2,277,376
20	Mar 30, 2026 19:05	3,168	57,319,482	32,858,000	1,991,000	2,486,272
21	Mar 30, 2026 19:01	3,168	65,439,082	33,854,000	995,000	2,404,352
22	Mar 30, 2026 19:13	3,168	60,750,684	33,853,000	995,000	2,404,352
23	Mar 30, 2026 19:00	3,168	62,228,817	32,859,000	1,991,000	2,404,352
24	Mar 30, 2026 19:08	3,168	59,103,008	33,849,000	995,000	2,273,280
25	Mar 30, 2026 19:04	3,168	66,098,130	32,855,000	1,991,000	2,392,064
26	Mar 30, 2026 19:07	3,168	63,229,858	33,852,000	995,000	2,510,848
27	Mar 30, 2026 19:09	3,169	69,020,207	32,868,000	1,992,000	2,277,376
28	Mar 30, 2026 19:13	3,169	64,549,048	32,865,000	1,991,000	2,277,376
29	Mar 30, 2026 19:14	3,169	68,697,156	32,872,000	1,992,000	2,277,376
30	Mar 30, 2026 19:12	3,169	60,666,395	32,871,000	1,992,000	2,277,376
31	Mar 30, 2026 18:56	3,169	60,039,534	34,857,000	0	2,486,272
32	Mar 30, 2026 19:05	3,169	64,469,834	33,865,000	996,000	2,277,376
33	Mar 30, 2026 19:05	3,169	59,138,425	33,865,000	996,000	2,277,376
34	Mar 30, 2026 19:04	3,169	55,889,422	32,867,000	1,991,000	2,396,160
35	Mar 30, 2026 19:06	3,170	62,885,701	33,870,000	996,000	2,400,256
36	Mar 30, 2026 19:00	3,170	65,626,426	32,877,000	1,992,000	2,404,352
37	Mar 30, 2026 19:04	3,171	64,128,026	32,885,000	1,993,000	2,277,376
38	Mar 30, 2026 19:03	3,171	57,567,120	33,890,000	996,000	2,396,160
39	Mar 30, 2026 19:01	3,172	56,629,961	33,870,000	1,026,000	2,400,256
40	Mar 30, 2026 18:56	3,173	62,164,512	32,910,000	1,994,000	2,277,376
41	Mar 30, 2026 19:13	3,173	61,119,548	33,902,000	997,000	2,277,376
42	Mar 30, 2026 19:03	3,174	57,712,032	32,922,000	1,995,000	2,404,352
43	Mar 30, 2026 19:08	3,175	59,222,870	33,926,000	997,000	2,277,376
44	Mar 30, 2026 19:16	3,176	62,343,558	33,937,000	998,000	2,408,448
45	Mar 30, 2026 19:05	3,176	60,851,776	33,939,000	998,000	2,277,376
46	Mar 30, 2026 18:59	3,176	59,074,857	33,935,000	998,000	2,400,256
47	Mar 30, 2026 19:14	3,177	57,422,735	33,946,000	998,000	2,396,160
48	Mar 30, 2026 19:10	3,178	59,289,137	33,956,000	998,000	2,277,376
49	Mar 30, 2026 19:16	3,179	57,712,805	32,973,000	1,998,000	2,277,376
50	Mar 30, 2026 19:15	3,179	57,418,362	33,974,000	999,000	2,277,376
51	Mar 30, 2026 19:11	3,179	57,994,909	33,970,000	999,000	2,396,160
52	Mar 30, 2026 19:10	3,181	62,717,538	32,991,000	1,999,000	2,400,256
53	Mar 30, 2026 19:14	3,183	57,823,290	33,017,000	2,001,000	2,404,352
54	Mar 30, 2026 18:59	3,183	61,367,110	34,015,000	1,000,000	2,277,376
55	Mar 30, 2026 19:11	3,184	58,022,853	33,026,000	2,001,000	2,277,376
56	Mar 30, 2026 19:00	3,185	60,228,426	33,035,000	2,002,000	2,396,160
57	Mar 30, 2026 19:10	3,185	61,291,273	33,032,000	2,001,000	2,396,160
58	Mar 30, 2026 19:11	3,186	58,824,501	34,045,000	1,001,000	2,519,040
59	Mar 30, 2026 19:12	3,187	58,527,876	35,058,000	0	2,400,256
60	Mar 30, 2026 19:11	3,187	71,316,441	33,056,000	2,003,000	2,277,376

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