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 02:53	3,148	63,656,497	33,612,000	1,018,000	2,277,376
2	Mar 30, 2026 02:45	3,149	58,979,466	33,619,000	1,018,000	2,392,064
3	Mar 30, 2026 02:51	3,150	62,940,581	33,629,000	1,019,000	2,277,376
4	Mar 30, 2026 02:46	3,154	68,239,252	33,676,000	1,020,000	2,277,376
5	Mar 30, 2026 02:52	3,156	66,065,138	34,717,000	0	2,277,376
6	Mar 30, 2026 02:49	3,160	66,271,580	32,775,000	1,986,000	2,486,272
7	Mar 30, 2026 02:49	3,164	62,880,507	32,819,000	1,989,000	2,277,376
8	Mar 30, 2026 02:53	3,166	61,797,207	32,836,000	1,990,000	2,277,376
9	Mar 30, 2026 02:46	3,167	62,870,241	33,840,000	995,000	2,396,160
10	Mar 30, 2026 02:49	3,167	60,712,180	32,846,000	1,990,000	2,277,376
11	Mar 30, 2026 02:51	3,167	68,006,588	33,838,000	995,000	2,277,376
12	Mar 30, 2026 02:44	3,167	63,168,835	32,849,000	1,990,000	2,277,376
13	Mar 30, 2026 02:53	3,167	59,714,290	32,847,000	1,990,000	2,396,160
14	Mar 30, 2026 02:54	3,168	63,121,380	32,855,000	1,991,000	2,277,376
15	Mar 30, 2026 02:49	3,168	63,425,669	34,846,000	0	2,404,352
16	Mar 30, 2026 02:44	3,168	62,721,861	32,853,000	1,991,000	2,396,160
17	Mar 30, 2026 02:54	3,168	60,631,229	33,855,000	995,000	2,277,376
18	Mar 30, 2026 02:49	3,168	63,587,205	32,852,000	1,991,000	2,277,376
19	Mar 30, 2026 02:46	3,168	65,373,572	33,851,000	995,000	2,277,376
20	Mar 30, 2026 02:52	3,168	64,795,631	33,852,000	995,000	2,400,256
21	Mar 30, 2026 02:52	3,168	63,497,354	32,858,000	1,991,000	2,277,376
22	Mar 30, 2026 02:53	3,168	66,991,825	33,852,000	995,000	2,277,376
23	Mar 30, 2026 02:45	3,168	68,930,366	34,849,000	0	2,277,376
24	Mar 30, 2026 02:49	3,169	62,724,686	33,864,000	996,000	2,277,376
25	Mar 30, 2026 02:50	3,169	62,849,698	33,861,000	995,000	2,277,376
26	Mar 30, 2026 02:47	3,169	68,024,352	34,857,000	0	2,396,160
27	Mar 30, 2026 02:50	3,169	67,015,188	32,867,000	1,991,000	2,277,376
28	Mar 30, 2026 02:44	3,169	65,108,475	32,864,000	1,991,000	2,396,160
29	Mar 30, 2026 02:53	3,169	59,416,124	33,860,000	995,000	2,277,376
30	Mar 30, 2026 02:48	3,169	60,137,597	32,872,000	1,992,000	2,392,064
31	Mar 30, 2026 02:51	3,169	59,595,229	32,864,000	1,991,000	2,400,256
32	Mar 30, 2026 02:51	3,169	58,990,686	33,867,000	996,000	2,392,064
33	Mar 30, 2026 02:43	3,170	62,709,764	32,883,000	1,992,000	2,396,160
34	Mar 30, 2026 02:48	3,170	61,943,492	32,875,000	1,992,000	2,277,376
35	Mar 30, 2026 02:51	3,170	65,972,729	32,877,000	1,992,000	2,486,272
36	Mar 30, 2026 02:48	3,171	64,943,628	32,887,000	1,993,000	2,277,376
37	Mar 30, 2026 02:44	3,171	60,752,963	32,884,000	1,992,000	2,400,256
38	Mar 30, 2026 02:45	3,171	69,495,477	34,876,000	0	2,404,352
39	Mar 30, 2026 02:46	3,172	62,152,282	33,892,000	996,000	2,506,752
40	Mar 30, 2026 02:42	3,172	57,393,993	33,899,000	997,000	2,510,848
41	Mar 30, 2026 02:45	3,173	55,667,505	32,910,000	1,994,000	2,396,160
42	Mar 30, 2026 02:47	3,174	58,465,987	33,918,000	997,000	2,277,376
43	Mar 30, 2026 02:42	3,175	55,547,528	32,928,000	1,995,000	2,277,376
44	Mar 30, 2026 02:46	3,175	60,911,215	33,926,000	997,000	2,277,376
45	Mar 30, 2026 02:43	3,175	67,885,526	32,930,000	1,995,000	2,277,376
46	Mar 30, 2026 02:43	3,175	64,282,895	32,931,000	1,995,000	2,277,376
47	Mar 30, 2026 02:51	3,176	61,841,825	32,941,000	1,996,000	2,396,160
48	Mar 30, 2026 02:44	3,176	66,565,976	32,942,000	1,996,000	2,277,376
49	Mar 30, 2026 02:50	3,177	58,027,589	33,944,000	998,000	2,400,256
50	Mar 30, 2026 02:42	3,178	57,510,504	32,962,000	1,997,000	2,277,376
51	Mar 30, 2026 02:47	3,178	62,008,112	33,963,000	998,000	2,277,376
52	Mar 30, 2026 02:48	3,179	62,539,625	33,966,000	999,000	2,277,376
53	Mar 30, 2026 02:45	3,179	65,594,475	33,966,000	999,000	2,277,376
54	Mar 30, 2026 02:48	3,180	62,785,572	32,982,000	1,998,000	2,277,376
55	Mar 30, 2026 02:46	3,180	59,360,200	32,983,000	1,998,000	2,277,376
56	Mar 30, 2026 02:53	3,180	58,020,402	33,984,000	999,000	2,396,160
57	Mar 30, 2026 02:45	3,181	61,598,706	33,996,000	999,000	2,404,352
58	Mar 30, 2026 02:48	3,183	61,521,947	34,008,000	1,000,000	2,400,256
59	Mar 30, 2026 02:54	3,183	64,494,250	34,018,000	1,000,000	2,400,256
60	Mar 30, 2026 02:44	3,185	57,041,637	33,031,000	2,001,000	2,396,160

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