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 01:45	3,146	62,623,986	33,590,000	1,017,000	2,277,376
2	Mar 30, 2026 01:54	3,146	64,339,377	33,591,000	1,017,000	2,404,352
3	Mar 30, 2026 01:49	3,147	65,769,857	34,619,000	0	2,281,472
4	Mar 30, 2026 01:49	3,149	65,242,983	33,617,000	1,018,000	2,404,352
5	Mar 30, 2026 01:46	3,149	65,633,126	34,643,000	0	2,396,160
6	Mar 30, 2026 01:46	3,153	59,970,425	33,661,000	1,020,000	2,277,376
7	Mar 30, 2026 01:43	3,155	57,348,312	33,687,000	1,020,000	2,277,376
8	Mar 30, 2026 01:51	3,155	68,742,252	33,688,000	1,020,000	2,277,376
9	Mar 30, 2026 01:55	3,165	59,376,742	33,820,000	994,000	2,465,792
10	Mar 30, 2026 01:45	3,166	58,304,486	34,826,000	0	2,277,376
11	Mar 30, 2026 01:53	3,166	61,325,413	33,833,000	995,000	2,392,064
12	Mar 30, 2026 01:51	3,166	60,652,782	32,832,000	1,989,000	2,277,376
13	Mar 30, 2026 01:52	3,167	64,703,518	32,847,000	1,990,000	2,396,160
14	Mar 30, 2026 01:51	3,168	59,907,840	33,850,000	995,000	2,277,376
15	Mar 30, 2026 01:55	3,168	64,157,003	33,849,000	995,000	2,408,448
16	Mar 30, 2026 01:48	3,168	60,847,912	32,861,000	1,991,000	2,277,376
17	Mar 30, 2026 01:50	3,168	66,434,923	33,858,000	995,000	2,400,256
18	Mar 30, 2026 01:44	3,168	65,985,512	32,855,000	1,991,000	2,277,376
19	Mar 30, 2026 01:51	3,168	60,887,558	32,860,000	1,991,000	2,277,376
20	Mar 30, 2026 01:51	3,168	70,780,755	33,849,000	995,000	2,404,352
21	Mar 30, 2026 01:46	3,168	62,028,317	33,851,000	995,000	2,277,376
22	Mar 30, 2026 01:52	3,168	63,944,102	33,852,000	995,000	2,396,160
23	Mar 30, 2026 01:45	3,168	60,878,565	32,861,000	1,991,000	2,277,376
24	Mar 30, 2026 01:53	3,169	64,197,531	32,864,000	1,991,000	2,277,376
25	Mar 30, 2026 01:54	3,169	62,925,194	32,866,000	1,991,000	2,277,376
26	Mar 30, 2026 01:53	3,169	63,043,327	34,855,000	0	2,277,376
27	Mar 30, 2026 01:50	3,169	62,324,886	32,868,000	1,992,000	2,396,160
28	Mar 30, 2026 01:49	3,169	61,200,500	32,868,000	1,992,000	2,387,968
29	Mar 30, 2026 01:43	3,169	66,606,314	32,866,000	1,991,000	2,277,376
30	Mar 30, 2026 01:46	3,169	59,805,961	32,871,000	1,992,000	2,392,064
31	Mar 30, 2026 01:47	3,169	64,349,794	32,870,000	1,992,000	2,392,064
32	Mar 30, 2026 01:54	3,170	65,635,348	33,869,000	996,000	2,277,376
33	Mar 30, 2026 01:45	3,170	61,141,155	33,874,000	996,000	2,392,064
34	Mar 30, 2026 01:51	3,170	59,658,316	33,869,000	996,000	2,396,160
35	Mar 30, 2026 01:43	3,171	57,524,404	33,886,000	996,000	2,277,376
36	Mar 30, 2026 01:54	3,171	60,646,170	34,884,000	0	2,396,160
37	Mar 30, 2026 01:54	3,172	57,863,276	33,892,000	996,000	2,277,376
38	Mar 30, 2026 01:48	3,173	58,403,517	32,907,000	1,994,000	2,392,064
39	Mar 30, 2026 01:44	3,173	57,738,354	33,909,000	997,000	2,277,376
40	Mar 30, 2026 01:48	3,174	60,547,858	33,918,000	997,000	2,277,376
41	Mar 30, 2026 01:46	3,174	63,082,230	33,920,000	997,000	2,392,064
42	Mar 30, 2026 01:44	3,175	58,221,515	32,931,000	1,995,000	2,277,376
43	Mar 30, 2026 01:45	3,176	61,924,449	32,939,000	1,996,000	2,396,160
44	Mar 30, 2026 01:52	3,177	59,579,979	33,944,000	998,000	2,408,448
45	Mar 30, 2026 01:47	3,178	63,043,644	33,962,000	998,000	2,277,376
46	Mar 30, 2026 01:52	3,178	58,945,212	33,959,000	998,000	2,277,376
47	Mar 30, 2026 01:55	3,179	58,557,771	32,972,000	1,998,000	2,404,352
48	Mar 30, 2026 01:52	3,179	56,456,140	32,975,000	1,998,000	2,277,376
49	Mar 30, 2026 01:46	3,180	55,612,295	33,981,000	999,000	2,277,376
50	Mar 30, 2026 01:50	3,180	63,961,451	32,979,000	1,998,000	2,404,352
51	Mar 30, 2026 01:50	3,182	60,244,861	33,005,000	2,000,000	2,277,376
52	Mar 30, 2026 01:48	3,182	56,599,416	33,007,000	2,000,000	2,277,376
53	Mar 30, 2026 01:50	3,182	57,584,787	34,005,000	1,000,000	2,510,848
54	Mar 30, 2026 01:48	3,182	61,477,205	32,998,000	1,999,000	2,277,376
55	Mar 30, 2026 01:54	3,183	56,770,592	34,018,000	1,000,000	2,277,376
56	Mar 30, 2026 01:52	3,185	56,719,993	33,032,000	2,001,000	2,277,376
57	Mar 30, 2026 01:48	3,186	60,203,429	33,044,000	2,002,000	2,400,256
58	Mar 30, 2026 01:47	3,188	64,044,251	33,069,000	2,004,000	2,277,376
59	Mar 30, 2026 01:45	3,189	57,639,534	33,075,000	2,004,000	2,277,376
60	Mar 30, 2026 01:50	3,189	61,787,042	34,073,000	1,002,000	2,277,376

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