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 18:14	3,151	66,237,318	33,643,000	1,019,000	2,277,376
2	Mar 30, 2026 18:11	3,153	64,105,657	33,665,000	1,020,000	2,277,376
3	Mar 30, 2026 18:11	3,154	67,909,583	33,678,000	1,020,000	2,277,376
4	Mar 30, 2026 18:16	3,155	60,000,922	33,681,000	1,020,000	2,277,376
5	Mar 30, 2026 18:00	3,156	59,058,103	33,693,000	1,021,000	2,293,760
6	Mar 30, 2026 18:11	3,164	63,249,215	32,819,000	1,989,000	2,478,080
7	Mar 30, 2026 18:02	3,165	62,175,113	32,828,000	1,989,000	2,400,256
8	Mar 30, 2026 18:03	3,165	64,447,561	33,822,000	994,000	2,277,376
9	Mar 30, 2026 18:10	3,166	66,764,458	33,828,000	994,000	2,277,376
10	Mar 30, 2026 18:06	3,166	60,758,261	34,828,000	0	2,277,376
11	Mar 30, 2026 18:12	3,167	63,132,845	32,846,000	1,990,000	2,277,376
12	Mar 30, 2026 18:03	3,167	65,817,425	33,842,000	995,000	2,277,376
13	Mar 30, 2026 18:15	3,167	62,423,566	33,847,000	995,000	2,400,256
14	Mar 30, 2026 18:16	3,167	66,773,934	32,848,000	1,990,000	2,404,352
15	Mar 30, 2026 18:05	3,167	62,839,554	32,845,000	1,990,000	2,277,376
16	Mar 30, 2026 18:12	3,168	67,880,500	33,858,000	995,000	2,277,376
17	Mar 30, 2026 18:13	3,168	59,950,049	33,857,000	995,000	2,277,376
18	Mar 30, 2026 18:07	3,168	67,930,482	33,852,000	995,000	2,396,160
19	Mar 30, 2026 18:06	3,168	61,816,752	34,852,000	0	2,277,376
20	Mar 30, 2026 18:06	3,168	58,468,280	33,854,000	995,000	2,277,376
21	Mar 30, 2026 18:00	3,168	60,744,422	32,854,000	1,991,000	2,387,968
22	Mar 30, 2026 18:05	3,168	59,226,291	33,848,000	995,000	2,281,472
23	Mar 30, 2026 18:14	3,168	61,664,973	33,857,000	995,000	2,277,376
24	Mar 30, 2026 18:05	3,168	60,952,838	32,855,000	1,991,000	2,277,376
25	Mar 30, 2026 18:01	3,168	64,056,267	32,860,000	1,991,000	2,510,848
26	Mar 30, 2026 18:14	3,168	64,184,093	33,850,000	995,000	2,277,376
27	Mar 30, 2026 18:09	3,169	62,552,328	33,865,000	996,000	2,400,256
28	Mar 30, 2026 18:01	3,169	61,120,839	32,868,000	1,992,000	2,277,376
29	Mar 30, 2026 18:02	3,169	64,321,192	32,871,000	1,992,000	2,277,376
30	Mar 30, 2026 18:10	3,169	59,171,839	32,865,000	1,991,000	2,392,064
31	Mar 30, 2026 18:15	3,169	72,946,209	34,864,000	0	2,277,376
32	Mar 30, 2026 18:03	3,169	64,756,954	32,868,000	1,992,000	2,277,376
33	Mar 30, 2026 18:04	3,169	58,839,417	32,863,000	1,991,000	2,482,176
34	Mar 30, 2026 18:05	3,169	67,538,218	33,863,000	995,000	2,400,256
35	Mar 30, 2026 18:13	3,169	64,660,512	33,866,000	996,000	2,400,256
36	Mar 30, 2026 18:08	3,169	62,043,159	32,872,000	1,992,000	2,396,160
37	Mar 30, 2026 18:07	3,169	61,173,074	33,860,000	995,000	2,396,160
38	Mar 30, 2026 18:13	3,170	61,875,775	33,873,000	996,000	2,392,064
39	Mar 30, 2026 18:08	3,170	60,642,549	32,883,000	1,992,000	2,510,848
40	Mar 30, 2026 18:04	3,170	58,944,507	32,876,000	1,992,000	2,400,256
41	Mar 30, 2026 18:01	3,171	62,929,199	32,885,000	1,993,000	2,277,376
42	Mar 30, 2026 18:07	3,171	61,567,256	33,886,000	996,000	2,277,376
43	Mar 30, 2026 18:12	3,172	63,219,051	33,863,000	1,026,000	2,277,376
44	Mar 30, 2026 18:05	3,172	68,742,891	33,896,000	996,000	2,396,160
45	Mar 30, 2026 18:14	3,172	61,019,127	33,900,000	997,000	2,277,376
46	Mar 30, 2026 18:02	3,174	62,039,617	33,913,000	997,000	2,277,376
47	Mar 30, 2026 18:04	3,176	60,616,704	32,943,000	1,996,000	2,396,160
48	Mar 30, 2026 18:16	3,177	58,112,168	32,953,000	1,997,000	2,277,376
49	Mar 30, 2026 18:14	3,178	56,273,750	32,957,000	1,997,000	2,404,352
50	Mar 30, 2026 18:15	3,178	58,561,408	32,957,000	1,997,000	2,396,160
51	Mar 30, 2026 18:05	3,180	58,083,492	32,981,000	1,998,000	2,277,376
52	Mar 30, 2026 18:09	3,180	58,089,548	32,980,000	1,998,000	2,396,160
53	Mar 30, 2026 18:09	3,182	55,247,237	34,005,000	1,000,000	2,400,256
54	Mar 30, 2026 18:00	3,182	57,950,623	33,999,000	999,000	2,277,376
55	Mar 30, 2026 18:14	3,183	58,425,215	34,014,000	1,000,000	2,277,376
56	Mar 30, 2026 18:08	3,183	58,532,963	34,009,000	1,000,000	2,277,376
57	Mar 30, 2026 18:10	3,183	57,904,268	34,012,000	1,000,000	2,494,464

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