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 05:23	3,149	59,644,947	34,640,000	0	2,404,352
2	Mar 30, 2026 05:18	3,151	62,024,717	33,647,000	1,019,000	2,404,352
3	Mar 30, 2026 05:17	3,153	60,401,892	34,684,000	0	2,277,376
4	Mar 30, 2026 05:21	3,154	62,024,322	33,669,000	1,020,000	2,277,376
5	Mar 30, 2026 05:22	3,155	65,565,067	33,684,000	1,020,000	2,277,376
6	Mar 30, 2026 05:27	3,155	60,031,276	33,683,000	1,020,000	2,277,376
7	Mar 30, 2026 05:24	3,157	61,077,959	34,724,000	0	2,392,064
8	Mar 30, 2026 05:20	3,158	68,201,819	33,712,000	1,021,000	2,277,376
9	Mar 30, 2026 05:26	3,162	63,451,828	33,794,000	993,000	2,510,848
10	Mar 30, 2026 05:22	3,164	62,862,521	33,815,000	994,000	2,277,376
11	Mar 30, 2026 05:17	3,166	59,457,176	32,836,000	1,990,000	2,404,352
12	Mar 30, 2026 05:18	3,166	58,575,780	32,836,000	1,990,000	2,396,160
13	Mar 30, 2026 05:24	3,167	60,467,680	33,841,000	995,000	2,277,376
14	Mar 30, 2026 05:23	3,167	61,984,093	34,839,000	0	2,277,376
15	Mar 30, 2026 05:16	3,167	65,146,104	33,840,000	995,000	2,277,376
16	Mar 30, 2026 05:23	3,168	62,002,354	32,862,000	1,991,000	2,277,376
17	Mar 30, 2026 05:27	3,168	64,843,913	34,848,000	0	2,277,376
18	Mar 30, 2026 05:22	3,168	61,095,450	33,849,000	995,000	2,396,160
19	Mar 30, 2026 05:23	3,168	63,782,593	34,843,000	0	2,277,376
20	Mar 30, 2026 05:26	3,169	65,212,636	33,860,000	995,000	2,281,472
21	Mar 30, 2026 05:19	3,169	60,502,593	32,865,000	1,991,000	2,400,256
22	Mar 30, 2026 05:16	3,169	60,981,245	32,866,000	1,991,000	2,502,656
23	Mar 30, 2026 05:25	3,169	63,108,512	32,864,000	1,991,000	2,408,448
24	Mar 30, 2026 05:20	3,169	67,032,697	33,859,000	995,000	2,277,376
25	Mar 30, 2026 05:20	3,169	61,747,797	32,863,000	1,991,000	2,392,064
26	Mar 30, 2026 05:21	3,169	60,833,892	33,860,000	995,000	2,277,376
27	Mar 30, 2026 05:18	3,169	65,740,075	32,867,000	1,991,000	2,396,160
28	Mar 30, 2026 05:24	3,169	63,112,698	32,868,000	1,992,000	2,396,160
29	Mar 30, 2026 05:24	3,169	61,098,494	33,863,000	995,000	2,490,368
30	Mar 30, 2026 05:25	3,170	61,741,231	33,874,000	996,000	2,277,376
31	Mar 30, 2026 05:18	3,170	71,174,742	33,879,000	996,000	2,396,160
32	Mar 30, 2026 05:26	3,170	58,014,748	33,871,000	996,000	2,277,376
33	Mar 30, 2026 05:18	3,171	58,239,473	32,884,000	1,993,000	2,400,256
34	Mar 30, 2026 05:26	3,172	57,107,321	33,894,000	996,000	2,277,376
35	Mar 30, 2026 05:16	3,172	62,116,271	32,894,000	1,993,000	2,400,256
36	Mar 30, 2026 05:21	3,173	57,656,840	32,907,000	1,994,000	2,400,256
37	Mar 30, 2026 05:18	3,173	60,763,431	33,906,000	997,000	2,404,352
38	Mar 30, 2026 05:16	3,173	58,438,887	32,913,000	1,994,000	2,273,280
39	Mar 30, 2026 05:24	3,173	57,055,912	32,906,000	1,994,000	2,277,376
40	Mar 30, 2026 05:19	3,175	61,801,819	32,928,000	1,995,000	2,277,376
41	Mar 30, 2026 05:15	3,175	57,805,498	33,931,000	997,000	2,281,472
42	Mar 30, 2026 05:24	3,176	62,357,761	33,935,000	998,000	2,277,376
43	Mar 30, 2026 05:27	3,176	57,671,002	32,938,000	1,996,000	2,400,256
44	Mar 30, 2026 05:21	3,176	58,163,081	33,942,000	998,000	2,392,064
45	Mar 30, 2026 05:21	3,177	63,228,722	33,947,000	998,000	2,277,376
46	Mar 30, 2026 05:26	3,179	56,367,641	33,966,000	999,000	2,400,256
47	Mar 30, 2026 05:20	3,179	60,294,050	33,967,000	999,000	2,396,160
48	Mar 30, 2026 05:15	3,180	56,923,975	33,981,000	999,000	2,400,256
49	Mar 30, 2026 05:23	3,180	60,042,234	31,978,000	2,997,000	2,273,280
50	Mar 30, 2026 05:23	3,181	54,480,093	32,988,000	1,999,000	2,277,376
51	Mar 30, 2026 05:21	3,182	60,265,224	33,005,000	2,000,000	2,404,352
52	Mar 30, 2026 05:26	3,182	63,070,251	32,999,000	1,999,000	2,277,376
53	Mar 30, 2026 05:16	3,182	57,269,108	33,004,000	2,000,000	2,478,080
54	Mar 30, 2026 05:20	3,183	61,869,282	34,014,000	1,000,000	2,400,256
55	Mar 30, 2026 05:25	3,184	60,806,258	33,025,000	2,001,000	2,277,376
56	Mar 30, 2026 05:20	3,185	55,283,829	34,034,000	1,001,000	2,490,368
57	Mar 30, 2026 05:15	3,185	65,622,975	34,034,000	1,001,000	2,392,064
58	Mar 30, 2026 05:19	3,186	61,077,395	33,040,000	2,002,000	2,400,256
59	Mar 30, 2026 05:17	3,187	58,597,333	34,055,000	1,001,000	2,396,160
60	Mar 30, 2026 05:16	3,191	64,598,958	34,101,000	1,002,000	2,273,280

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