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 05:07

Josu San MartinScore: 3,032Success

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Feb 6, 2026 05:13	2,976	28,232,452	5,314,000	2,125,000	2,301,952
2	Feb 6, 2026 05:09	2,989	20,973,752	6,405,000	1,067,000	2,301,952
3	Feb 6, 2026 05:13	2,990	24,911,018	4,271,000	3,203,000	2,301,952
4	Feb 6, 2026 05:10	2,992	25,179,365	7,481,000	0	2,424,832
5	Feb 6, 2026 05:07	2,994	22,806,711	7,486,000	0	2,301,952
6	Feb 6, 2026 05:13	2,998	21,986,143	4,282,000	3,212,000	2,301,952
7	Feb 6, 2026 05:21	3,000	22,447,391	6,430,000	1,071,000	2,428,928
8	Feb 6, 2026 05:08	3,003	23,982,590	5,363,000	2,145,000	2,301,952
9	Feb 6, 2026 05:08	3,005	25,709,818	5,367,000	2,146,000	2,424,832
10	Feb 6, 2026 05:07	3,006	24,939,574	6,441,000	1,073,000	2,301,952
11	Feb 6, 2026 05:13	3,006	21,655,948	5,367,000	2,147,000	2,424,832
12	Feb 6, 2026 05:08	3,006	24,728,330	5,369,000	2,147,000	2,424,832
13	Feb 6, 2026 05:08	3,014	24,201,778	5,383,000	2,153,000	2,428,928
14	Feb 6, 2026 05:13	3,014	20,145,743	6,458,000	1,076,000	2,433,024
15	Feb 6, 2026 05:13	3,014	23,661,792	6,458,000	1,076,000	2,428,928
16	Feb 6, 2026 05:08	3,016	28,890,181	5,385,000	2,154,000	2,301,952
17	Feb 6, 2026 05:21	3,019	22,812,158	7,547,000	0	2,301,952
18	Feb 6, 2026 05:07	3,019	22,659,900	6,469,000	1,078,000	2,301,952
19	Feb 6, 2026 05:08	3,025	20,472,327	6,482,000	1,080,000	2,424,832
20	Feb 6, 2026 05:19	3,028	24,841,557	4,326,000	3,244,000	2,424,832
21	Feb 6, 2026 05:09	3,028	28,891,010	5,407,000	2,163,000	2,301,952
22	Feb 6, 2026 05:07	3,032	24,222,434	5,415,000	2,166,000	2,424,832
23	Feb 6, 2026 05:13	3,033	24,679,557	7,582,000	0	2,531,328
24	Feb 6, 2026 05:19	3,033	27,090,448	6,500,000	1,083,000	2,420,736
25	Feb 6, 2026 05:08	3,034	26,773,535	6,501,000	1,083,000	2,424,832
26	Feb 6, 2026 05:19	3,036	23,922,019	6,506,000	1,084,000	2,424,832
27	Feb 6, 2026 05:13	3,036	28,247,662	6,505,000	1,084,000	2,424,832
28	Feb 6, 2026 05:09	3,036	21,053,285	7,589,000	0	2,506,752
29	Feb 6, 2026 05:10	3,042	26,089,794	5,432,000	2,172,000	2,424,832
30	Feb 6, 2026 05:08	3,042	23,883,569	4,345,000	3,259,000	2,420,736
31	Feb 6, 2026 05:08	3,046	21,303,724	5,439,000	2,175,000	2,523,136
32	Feb 6, 2026 05:08	3,074	23,208,601	7,685,000	0	2,506,752
33	Feb 6, 2026 05:07	3,090	23,266,350	6,621,000	1,103,000	2,506,752
34	Feb 6, 2026 05:08	3,092	21,926,282	6,626,000	1,104,000	2,424,832
35	Feb 6, 2026 05:07	3,102	28,574,363	7,756,000	0	2,424,832
36	Feb 6, 2026 05:07	3,103	22,673,276	7,758,000	0	2,428,928
37	Feb 6, 2026 05:07	3,104	27,363,309	5,542,000	2,217,000	2,301,952
38	Feb 6, 2026 05:13	3,105	22,860,224	4,436,000	3,327,000	2,297,856
39	Feb 6, 2026 05:10	3,112	22,930,784	5,558,000	2,223,000	2,420,736
40	Feb 6, 2026 05:21	3,112	28,799,254	6,669,000	1,111,000	2,428,928
41	Feb 6, 2026 05:08	3,165	21,137,719	6,924,000	989,000	2,301,952
42	Feb 6, 2026 05:07	3,335	23,959,007	6,254,000	2,084,000	2,424,832

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