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 20:41	3,146	59,274,209	33,593,000	1,017,000	2,392,064
2	Mar 30, 2026 20:36	3,149	66,241,194	33,623,000	1,018,000	2,396,160
3	Mar 30, 2026 20:31	3,152	59,450,164	33,648,000	1,019,000	2,277,376
4	Mar 30, 2026 20:30	3,152	58,676,577	34,672,000	0	2,277,376
5	Mar 30, 2026 20:29	3,152	67,094,131	34,675,000	0	2,396,160
6	Mar 30, 2026 20:34	3,153	62,870,141	34,679,000	0	2,400,256
7	Mar 30, 2026 20:38	3,153	58,246,506	33,664,000	1,020,000	2,277,376
8	Mar 30, 2026 20:38	3,154	60,648,210	33,672,000	1,020,000	2,396,160
9	Mar 30, 2026 20:28	3,155	65,396,547	34,700,000	0	2,277,376
10	Mar 30, 2026 20:36	3,156	64,944,054	33,692,000	1,020,000	2,277,376
11	Mar 30, 2026 20:26	3,157	58,889,643	33,706,000	1,021,000	2,277,376
12	Mar 30, 2026 20:39	3,165	63,291,317	32,822,000	1,989,000	2,277,376
13	Mar 30, 2026 20:33	3,166	61,482,255	33,836,000	995,000	2,277,376
14	Mar 30, 2026 20:26	3,167	58,962,757	33,846,000	995,000	2,519,040
15	Mar 30, 2026 20:37	3,167	61,685,618	33,838,000	995,000	2,277,376
16	Mar 30, 2026 20:29	3,167	65,138,158	32,851,000	1,991,000	2,277,376
17	Mar 30, 2026 20:28	3,167	61,070,558	34,833,000	0	2,408,448
18	Mar 30, 2026 20:27	3,168	64,980,300	33,852,000	995,000	2,277,376
19	Mar 30, 2026 20:41	3,168	61,068,750	32,856,000	1,991,000	2,277,376
20	Mar 30, 2026 20:37	3,168	62,621,113	33,854,000	995,000	2,277,376
21	Mar 30, 2026 20:40	3,168	59,640,448	33,852,000	995,000	2,392,064
22	Mar 30, 2026 20:31	3,168	64,739,713	34,852,000	0	2,383,872
23	Mar 30, 2026 20:37	3,168	64,128,684	32,857,000	1,991,000	2,277,376
24	Mar 30, 2026 20:37	3,168	69,142,428	33,851,000	995,000	2,277,376
25	Mar 30, 2026 20:28	3,168	64,861,212	32,862,000	1,991,000	2,400,256
26	Mar 30, 2026 20:25	3,168	66,422,439	34,853,000	0	2,277,376
27	Mar 30, 2026 20:25	3,169	65,942,657	34,854,000	0	2,277,376
28	Mar 30, 2026 20:37	3,169	60,626,499	33,862,000	995,000	2,404,352
29	Mar 30, 2026 20:41	3,169	61,161,855	33,859,000	995,000	2,277,376
30	Mar 30, 2026 20:33	3,169	63,096,040	32,865,000	1,991,000	2,277,376
31	Mar 30, 2026 20:31	3,169	65,753,690	33,863,000	995,000	2,404,352
32	Mar 30, 2026 20:34	3,170	64,030,578	33,878,000	996,000	2,396,160
33	Mar 30, 2026 20:27	3,170	59,741,073	33,870,000	996,000	2,277,376
34	Mar 30, 2026 20:40	3,170	59,193,578	33,877,000	996,000	2,277,376
35	Mar 30, 2026 20:27	3,170	65,173,130	32,881,000	1,992,000	2,277,376
36	Mar 30, 2026 20:34	3,171	62,137,173	33,882,000	996,000	2,277,376
37	Mar 30, 2026 20:30	3,171	59,755,620	32,889,000	1,993,000	2,473,984
38	Mar 30, 2026 20:37	3,172	60,235,097	32,903,000	1,994,000	2,273,280
39	Mar 30, 2026 20:32	3,172	61,690,008	32,902,000	1,994,000	2,277,376
40	Mar 30, 2026 20:30	3,173	58,078,853	32,913,000	1,994,000	2,396,160
41	Mar 30, 2026 20:25	3,173	58,649,415	33,907,000	997,000	2,273,280
42	Mar 30, 2026 20:33	3,173	58,725,135	32,908,000	1,994,000	2,396,160
43	Mar 30, 2026 20:35	3,173	57,610,913	32,910,000	1,994,000	2,396,160
44	Mar 30, 2026 20:39	3,173	57,457,583	33,873,000	1,026,000	2,396,160
45	Mar 30, 2026 20:42	3,174	56,904,535	33,915,000	997,000	2,277,376
46	Mar 30, 2026 20:26	3,174	60,503,130	32,922,000	1,995,000	2,277,376
47	Mar 30, 2026 20:39	3,174	60,750,046	33,913,000	997,000	2,277,376
48	Mar 30, 2026 20:35	3,175	60,118,966	32,926,000	1,995,000	2,396,160
49	Mar 30, 2026 20:42	3,176	63,792,813	32,938,000	1,996,000	2,404,352
50	Mar 30, 2026 20:29	3,176	61,124,224	32,945,000	1,996,000	2,277,376
51	Mar 30, 2026 20:42	3,181	57,520,533	33,994,000	999,000	2,277,376
52	Mar 30, 2026 20:36	3,182	64,939,623	34,002,000	1,000,000	2,404,352
53	Mar 30, 2026 20:38	3,183	62,359,844	33,010,000	2,000,000	2,277,376
54	Mar 30, 2026 20:29	3,183	58,211,127	34,011,000	1,000,000	2,404,352
55	Mar 30, 2026 20:32	3,183	59,131,378	33,016,000	2,000,000	2,396,160
56	Mar 30, 2026 20:29	3,184	56,877,877	33,021,000	2,001,000	2,277,376
57	Mar 30, 2026 20:32	3,185	58,021,008	34,036,000	1,001,000	2,396,160
58	Mar 30, 2026 20:29	3,186	63,110,883	34,046,000	1,001,000	2,277,376
59	Mar 30, 2026 20:35	3,187	57,873,873	35,057,000	0	2,277,376
60	Mar 30, 2026 20:40	3,187	59,176,873	33,055,000	2,003,000	2,277,376

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