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 16:18	3,147	59,095,171	34,620,000	0	2,277,376
2	Mar 30, 2026 16:15	3,148	58,837,693	34,631,000	0	2,277,376
3	Mar 30, 2026 16:18	3,149	61,493,569	34,635,000	0	2,277,376
4	Mar 30, 2026 16:26	3,149	59,961,181	33,621,000	1,018,000	2,519,040
5	Mar 30, 2026 16:09	3,151	59,744,157	33,639,000	1,019,000	2,400,256
6	Mar 30, 2026 16:17	3,151	63,165,524	34,659,000	0	2,277,376
7	Mar 30, 2026 16:18	3,151	61,709,893	33,638,000	1,019,000	2,277,376
8	Mar 30, 2026 16:22	3,151	63,436,403	34,657,000	0	2,277,376
9	Mar 30, 2026 16:24	3,152	62,076,937	34,672,000	0	2,400,256
10	Mar 30, 2026 16:24	3,153	59,065,977	34,688,000	0	2,277,376
11	Mar 30, 2026 16:12	3,154	59,739,324	33,676,000	1,020,000	2,404,352
12	Mar 30, 2026 16:23	3,155	64,685,707	34,701,000	0	2,277,376
13	Mar 30, 2026 16:26	3,155	65,323,009	34,701,000	0	2,277,376
14	Mar 30, 2026 16:10	3,155	62,175,981	33,685,000	1,020,000	2,396,160
15	Mar 30, 2026 16:26	3,160	59,804,612	32,772,000	1,986,000	2,277,376
16	Mar 30, 2026 16:26	3,164	67,815,320	33,811,000	994,000	2,277,376
17	Mar 30, 2026 16:18	3,165	63,620,505	33,819,000	994,000	2,400,256
18	Mar 30, 2026 16:09	3,165	60,854,069	32,822,000	1,989,000	2,400,256
19	Mar 30, 2026 16:10	3,165	60,811,218	33,821,000	994,000	2,277,376
20	Mar 30, 2026 16:16	3,166	58,547,971	33,836,000	995,000	2,494,464
21	Mar 30, 2026 16:21	3,166	61,105,956	33,835,000	995,000	2,277,376
22	Mar 30, 2026 16:13	3,167	60,266,025	32,848,000	1,990,000	2,277,376
23	Mar 30, 2026 16:15	3,167	68,613,518	33,841,000	995,000	2,277,376
24	Mar 30, 2026 16:21	3,167	65,076,358	34,841,000	0	2,277,376
25	Mar 30, 2026 16:16	3,168	65,887,317	32,861,000	1,991,000	2,404,352
26	Mar 30, 2026 16:09	3,168	65,938,783	33,849,000	995,000	2,277,376
27	Mar 30, 2026 16:25	3,168	62,265,435	32,859,000	1,991,000	2,277,376
28	Mar 30, 2026 16:13	3,168	57,535,783	33,855,000	995,000	2,277,376
29	Mar 30, 2026 16:22	3,168	59,134,466	32,858,000	1,991,000	2,519,040
30	Mar 30, 2026 16:22	3,168	64,772,202	33,858,000	995,000	2,277,376
31	Mar 30, 2026 16:22	3,169	63,694,758	34,864,000	0	2,387,968
32	Mar 30, 2026 16:18	3,169	60,943,412	34,861,000	0	2,404,352
33	Mar 30, 2026 16:22	3,169	60,336,539	32,863,000	1,991,000	2,400,256
34	Mar 30, 2026 16:16	3,170	61,944,833	32,875,000	1,992,000	2,510,848
35	Mar 30, 2026 16:25	3,170	57,710,522	32,877,000	1,992,000	2,277,376
36	Mar 30, 2026 16:14	3,170	62,118,293	33,873,000	996,000	2,396,160
37	Mar 30, 2026 16:17	3,171	67,606,702	34,884,000	0	2,277,376
38	Mar 30, 2026 16:14	3,171	60,558,408	32,891,000	1,993,000	2,408,448
39	Mar 30, 2026 16:18	3,171	60,819,477	32,888,000	1,993,000	2,392,064
40	Mar 30, 2026 16:19	3,173	60,784,571	33,901,000	997,000	2,400,256
41	Mar 30, 2026 16:23	3,174	62,234,980	32,922,000	1,995,000	2,277,376
42	Mar 30, 2026 16:17	3,174	56,925,438	33,921,000	997,000	2,392,064
43	Mar 30, 2026 16:21	3,176	62,904,741	33,940,000	998,000	2,404,352
44	Mar 30, 2026 16:25	3,176	62,801,664	32,943,000	1,996,000	2,273,280
45	Mar 30, 2026 16:20	3,176	64,064,826	33,933,000	998,000	2,277,376
46	Mar 30, 2026 16:24	3,176	57,306,664	32,941,000	1,996,000	2,277,376
47	Mar 30, 2026 16:14	3,178	60,026,414	32,956,000	1,997,000	2,277,376
48	Mar 30, 2026 16:26	3,178	62,104,812	33,956,000	998,000	2,277,376
49	Mar 30, 2026 16:13	3,178	57,672,948	32,966,000	1,997,000	2,277,376
50	Mar 30, 2026 16:19	3,178	63,011,091	33,960,000	998,000	2,277,376
51	Mar 30, 2026 16:12	3,179	65,829,360	32,968,000	1,998,000	2,396,160
52	Mar 30, 2026 16:20	3,180	57,611,121	33,976,000	999,000	2,277,376
53	Mar 30, 2026 16:20	3,181	59,805,582	32,987,000	1,999,000	2,400,256
54	Mar 30, 2026 16:15	3,185	56,796,091	35,036,000	0	2,277,376
55	Mar 30, 2026 16:10	3,186	56,772,012	33,043,000	2,002,000	2,404,352
56	Mar 30, 2026 16:22	3,187	64,988,747	34,056,000	1,001,000	2,277,376
57	Mar 30, 2026 16:23	3,189	59,264,979	34,075,000	1,002,000	2,396,160
58	Mar 30, 2026 16:12	3,189	60,433,914	34,080,000	1,002,000	2,392,064
59	Mar 30, 2026 16:19	3,190	56,772,837	33,089,000	2,005,000	2,445,312
60	Mar 30, 2026 16:26	3,200	57,150,889	33,190,000	2,011,000	2,273,280

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