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 13:15	3,150	68,454,804	33,630,000	1,019,000	2,408,448
2	Mar 30, 2026 13:16	3,151	59,606,445	33,645,000	1,019,000	2,396,160
3	Mar 30, 2026 13:06	3,152	66,439,669	34,675,000	0	2,277,376
4	Mar 30, 2026 13:09	3,152	60,649,593	33,657,000	1,019,000	2,396,160
5	Mar 30, 2026 13:18	3,153	61,379,334	33,662,000	1,020,000	2,277,376
6	Mar 30, 2026 13:09	3,153	65,407,991	33,668,000	1,020,000	2,392,064
7	Mar 30, 2026 13:19	3,155	61,978,119	33,715,000	991,000	2,396,160
8	Mar 30, 2026 13:14	3,156	59,704,306	34,717,000	0	2,277,376
9	Mar 30, 2026 13:12	3,164	65,105,748	32,811,000	1,988,000	2,281,472
10	Mar 30, 2026 13:18	3,167	65,906,729	34,837,000	0	2,277,376
11	Mar 30, 2026 13:18	3,167	61,821,657	34,836,000	0	2,277,376
12	Mar 30, 2026 13:17	3,168	61,385,975	33,849,000	995,000	2,277,376
13	Mar 30, 2026 13:17	3,168	60,162,329	33,849,000	995,000	2,494,464
14	Mar 30, 2026 13:13	3,168	61,495,951	33,848,000	995,000	2,396,160
15	Mar 30, 2026 13:11	3,168	63,949,143	33,857,000	995,000	2,277,376
16	Mar 30, 2026 13:11	3,168	62,094,629	33,849,000	995,000	2,273,280
17	Mar 30, 2026 13:06	3,168	62,137,878	33,856,000	995,000	2,396,160
18	Mar 30, 2026 13:06	3,168	62,434,647	33,848,000	995,000	2,281,472
19	Mar 30, 2026 13:06	3,168	65,913,916	33,852,000	995,000	2,404,352
20	Mar 30, 2026 13:10	3,169	59,051,503	32,865,000	1,991,000	2,396,160
21	Mar 30, 2026 13:19	3,169	65,421,390	32,867,000	1,991,000	2,408,448
22	Mar 30, 2026 13:09	3,169	64,370,037	32,866,000	1,991,000	2,277,376
23	Mar 30, 2026 13:16	3,169	62,010,308	34,856,000	0	2,392,064
24	Mar 30, 2026 13:15	3,169	61,141,517	32,863,000	1,991,000	2,277,376
25	Mar 30, 2026 13:08	3,169	62,600,482	33,864,000	996,000	2,396,160
26	Mar 30, 2026 13:07	3,170	60,773,127	34,867,000	0	2,396,160
27	Mar 30, 2026 13:18	3,170	59,429,364	33,877,000	996,000	2,387,968
28	Mar 30, 2026 13:16	3,170	64,385,891	33,872,000	996,000	2,277,376
29	Mar 30, 2026 13:08	3,170	62,782,227	33,872,000	996,000	2,387,968
30	Mar 30, 2026 13:07	3,171	62,166,393	33,881,000	996,000	2,277,376
31	Mar 30, 2026 13:09	3,171	58,323,841	32,885,000	1,993,000	2,277,376
32	Mar 30, 2026 13:14	3,173	57,401,980	33,903,000	997,000	2,277,376
33	Mar 30, 2026 13:18	3,173	58,653,391	32,905,000	1,994,000	2,277,376
34	Mar 30, 2026 13:14	3,173	58,200,180	33,908,000	997,000	2,408,448
35	Mar 30, 2026 13:12	3,174	55,256,122	32,922,000	1,995,000	2,408,448
36	Mar 30, 2026 13:06	3,174	58,760,267	33,913,000	997,000	2,277,376
37	Mar 30, 2026 13:06	3,175	57,881,674	32,934,000	1,996,000	2,400,256
38	Mar 30, 2026 13:18	3,177	56,857,956	32,953,000	1,997,000	2,277,376
39	Mar 30, 2026 13:16	3,177	57,303,193	33,946,000	998,000	2,396,160
40	Mar 30, 2026 13:16	3,177	59,410,999	32,955,000	1,997,000	2,392,064
41	Mar 30, 2026 13:16	3,177	58,354,219	32,951,000	1,997,000	2,277,376
42	Mar 30, 2026 13:09	3,177	57,919,383	33,947,000	998,000	2,404,352
43	Mar 30, 2026 13:13	3,179	57,400,303	32,968,000	1,998,000	2,273,280
44	Mar 30, 2026 13:07	3,181	61,361,788	33,995,000	999,000	2,400,256
45	Mar 30, 2026 13:17	3,181	60,983,131	32,990,000	1,999,000	2,277,376
46	Mar 30, 2026 13:19	3,183	60,848,854	34,012,000	1,000,000	2,277,376
47	Mar 30, 2026 13:13	3,184	58,250,578	33,019,000	2,001,000	2,277,376
48	Mar 30, 2026 13:11	3,184	62,430,550	34,024,000	1,000,000	2,396,160
49	Mar 30, 2026 13:10	3,184	60,034,194	33,024,000	2,001,000	2,387,968
50	Mar 30, 2026 13:15	3,186	58,051,671	34,050,000	1,001,000	2,396,160
51	Mar 30, 2026 13:08	3,186	57,927,946	33,044,000	2,002,000	2,400,256
52	Mar 30, 2026 13:10	3,187	61,805,363	34,052,000	1,001,000	2,277,376
53	Mar 30, 2026 13:09	3,187	58,023,642	32,057,000	3,005,000	2,273,280
54	Mar 30, 2026 13:12	3,190	63,717,246	34,088,000	1,002,000	2,396,160

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