Large integer multiplication

Multiply two large unsigned integers as fast as possible.

Input

Exactly 500,000 bytes on STDIN: two unsigned integers encoded back-to-back, each 250,000 bytes, in little-endian byte order.

Output

Write exactly 500,000 bytes to STDOUT containing the product in little-endian byte order.

Restrictions:600s256Mb 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.

Back to listFeb 6, 2026 15:29

Josu San MartinScore: 2,950Success

Source Code

Source code access is restricted. Log in to request access.

Challenge History

No challenges yet.

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 15, 2026 05:02	2,894	28,757,641	5,168,000	2,067,000	2,420,736
2	Mar 15, 2026 05:02	2,901	20,520,589	4,144,000	3,108,000	2,297,856
3	Feb 6, 2026 06:18	2,901	22,612,243	5,180,000	2,072,000	2,424,832
4	Feb 6, 2026 15:29	2,907	20,232,843	4,153,000	3,115,000	2,428,928
5	Mar 15, 2026 05:03	2,908	21,214,593	6,232,000	1,038,000	2,424,832
6	Mar 21, 2026 05:33	2,910	24,766,172	6,236,000	1,039,000	2,531,328
7	Mar 15, 2026 05:02	2,910	29,428,105	4,158,000	3,118,000	2,297,856
8	Mar 15, 2026 05:02	2,911	20,260,863	4,158,000	3,119,000	2,527,232
9	Feb 6, 2026 15:29	2,914	22,603,099	4,163,000	3,122,000	2,420,736
10	Mar 15, 2026 05:03	2,915	24,594,250	5,206,000	2,082,000	2,424,832
11	Mar 21, 2026 05:33	2,915	24,980,603	4,164,000	3,123,000	2,428,928
12	Feb 6, 2026 15:29	2,922	26,243,950	5,218,000	2,087,000	2,433,024
13	Mar 15, 2026 05:03	2,924	24,424,798	4,178,000	3,133,000	2,424,832
14	Mar 15, 2026 05:02	2,925	28,187,851	4,179,000	3,134,000	2,293,760
15	Feb 6, 2026 06:18	2,927	22,883,091	4,182,000	3,136,000	2,301,952
16	Feb 6, 2026 15:29	2,928	21,797,648	4,183,000	3,137,000	2,424,832
17	Feb 6, 2026 06:18	2,930	21,126,590	4,185,000	3,139,000	2,428,928
18	Feb 6, 2026 15:29	2,930	25,723,413	3,139,000	4,185,000	2,420,736
19	Feb 6, 2026 06:18	2,936	29,065,120	4,194,000	3,145,000	2,428,928
20	Feb 6, 2026 06:18	2,938	20,570,841	4,198,000	3,148,000	2,527,232
21	Feb 6, 2026 06:18	2,938	26,229,554	3,148,000	4,197,000	2,433,024
22	Feb 6, 2026 06:18	2,941	25,319,764	4,201,000	3,151,000	2,301,952
23	Feb 6, 2026 15:29	2,942	25,655,942	5,253,000	2,101,000	2,297,856
24	Mar 15, 2026 05:03	2,942	25,551,634	4,202,000	3,152,000	2,433,024
25	Feb 6, 2026 06:18	2,942	23,308,455	5,253,000	2,101,000	2,420,736
26	Mar 15, 2026 05:03	2,944	25,574,326	4,206,000	3,155,000	2,433,024
27	Feb 6, 2026 06:18	2,944	23,108,419	5,258,000	2,103,000	2,347,008
28	Feb 6, 2026 06:18	2,945	21,667,385	4,207,000	3,155,000	2,301,952
29	Feb 6, 2026 06:18	2,947	28,400,071	3,157,000	4,210,000	2,301,952
30	Feb 6, 2026 15:29	2,948	26,184,257	5,264,000	2,105,000	2,433,024
31	Feb 6, 2026 15:29	2,950	19,518,688	4,215,000	3,161,000	2,301,952
32	Feb 6, 2026 06:18	2,952	20,786,224	4,218,000	3,163,000	2,523,136
33	Feb 6, 2026 15:29	2,955	22,022,169	4,221,000	3,166,000	2,428,928
34	Feb 6, 2026 15:29	2,955	23,189,268	5,277,000	2,110,000	2,424,832
35	Feb 6, 2026 15:29	2,957	23,034,090	5,280,000	2,112,000	2,420,736
36	Mar 21, 2026 05:33	2,964	25,502,735	3,176,000	4,235,000	2,297,856
37	Feb 6, 2026 06:18	2,964	20,902,457	4,235,000	3,176,000	2,523,136
38	Feb 6, 2026 15:29	2,971	25,146,609	5,306,000	2,122,000	2,297,856
39	Feb 6, 2026 15:29	2,977	26,028,701	4,253,000	3,190,000	2,301,952
40	Mar 15, 2026 05:02	2,980	25,397,784	4,257,000	3,193,000	2,297,856
41	Mar 21, 2026 05:33	2,985	23,740,039	5,331,000	2,132,000	2,433,024
42	Mar 21, 2026 05:33	2,988	26,278,822	5,335,000	2,134,000	2,297,856
43	Mar 21, 2026 05:33	2,995	21,263,376	4,278,000	3,209,000	2,420,736
44	Mar 15, 2026 05:03	2,997	23,056,445	4,281,000	3,211,000	2,428,928
45	Mar 15, 2026 05:02	2,998	24,579,878	4,283,000	3,212,000	2,420,736
46	Mar 15, 2026 05:03	3,002	24,507,621	5,362,000	2,144,000	2,297,856
47	Mar 21, 2026 05:33	3,003	23,504,902	5,362,000	2,145,000	2,428,928
48	Mar 15, 2026 05:02	3,006	24,367,202	5,369,000	2,147,000	2,297,856
49	Feb 6, 2026 15:29	3,009	25,799,523	6,449,000	1,074,000	2,301,952
50	Mar 21, 2026 05:33	3,012	23,330,239	5,379,000	2,151,000	2,416,640
51	Mar 15, 2026 05:03	3,016	26,877,912	5,387,000	2,154,000	2,424,832
52	Feb 6, 2026 15:29	3,016	22,138,068	7,541,000	0	2,506,752
53	Feb 6, 2026 06:18	3,036	21,366,125	5,421,000	2,168,000	2,535,424
54	Feb 6, 2026 15:29	3,044	22,915,998	5,436,000	2,174,000	2,301,952
55	Feb 6, 2026 15:29	3,053	23,251,410	6,543,000	1,090,000	2,428,928
56	Feb 6, 2026 15:29	3,054	25,068,412	6,545,000	1,090,000	2,428,928
57	Feb 6, 2026 06:18	3,098	29,465,033	5,533,000	2,213,000	2,412,544
58	Mar 21, 2026 05:33	3,174	26,252,379	5,951,000	1,983,000	2,420,736
59	Mar 15, 2026 05:02	3,174	20,713,372	3,967,000	3,967,000	2,510,848
60	Mar 15, 2026 05:03	3,255	26,000,995	6,104,000	2,034,000	2,420,736

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