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 listMar 14, 2026 18:26

Dominique GarmierScore: 70,748Success

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Challenge History

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 14, 2026 18:36	70,643	202,676,967	175,605,000	1,003,000	2,519,040
2	Mar 14, 2026 18:20	70,654	210,928,508	174,629,000	2,007,000	2,510,848
3	Mar 14, 2026 18:19	70,658	207,089,025	176,644,000	0	2,289,664
4	Mar 14, 2026 18:08	70,659	210,200,404	174,640,000	2,007,000	2,289,664
5	Mar 14, 2026 18:20	70,660	206,970,252	175,648,000	1,003,000	2,289,664
6	Mar 14, 2026 18:20	70,660	202,437,299	174,642,000	2,007,000	2,265,088
7	Mar 14, 2026 18:08	70,664	208,420,706	174,653,000	2,007,000	2,289,664
8	Mar 14, 2026 18:08	70,666	201,063,558	174,658,000	2,007,000	2,289,664
9	Mar 14, 2026 18:08	70,672	204,386,680	176,679,000	0	2,330,624
10	Mar 14, 2026 18:18	70,673	205,962,593	175,680,000	1,003,000	2,289,664
11	Mar 14, 2026 18:47	70,678	204,766,395	176,694,000	0	2,519,040
12	Mar 14, 2026 18:20	70,678	203,805,553	174,687,000	2,007,000	2,375,680
13	Mar 14, 2026 18:20	70,678	203,823,053	174,687,000	2,007,000	2,433,024
14	Mar 14, 2026 18:08	70,682	206,650,940	174,709,000	1,996,000	2,289,664
15	Mar 14, 2026 18:08	70,682	200,541,760	175,700,000	1,004,000	2,510,848
16	Mar 14, 2026 18:08	70,684	207,253,184	174,715,000	1,996,000	2,281,472
17	Mar 14, 2026 18:31	70,721	202,793,065	174,805,000	1,997,000	2,289,664
18	Mar 14, 2026 18:29	70,726	200,751,327	173,819,000	2,996,000	2,510,848
19	Mar 14, 2026 18:47	70,728	206,581,656	173,824,000	2,996,000	2,260,992
20	Mar 14, 2026 18:45	70,730	201,197,323	173,828,000	2,997,000	2,260,992
21	Mar 14, 2026 18:33	70,731	203,759,420	173,831,000	2,997,000	2,289,664
22	Mar 14, 2026 18:47	70,732	205,683,941	174,831,000	1,998,000	2,289,664
23	Mar 14, 2026 18:20	70,741	208,596,068	173,855,000	2,997,000	2,260,992
24	Mar 14, 2026 18:08	70,744	200,666,151	173,863,000	2,997,000	2,289,664
25	Mar 14, 2026 18:19	70,748	202,424,788	174,872,000	1,998,000	2,510,848
26	Mar 14, 2026 18:19	70,756	205,101,656	173,893,000	2,998,000	2,260,992
27	Mar 14, 2026 18:20	70,759	201,169,381	173,899,000	2,998,000	2,265,088
28	Mar 14, 2026 18:33	70,766	206,560,361	173,917,000	2,998,000	2,289,664
29	Mar 14, 2026 18:14	70,774	201,633,587	174,935,000	1,999,000	2,265,088
30	Mar 14, 2026 18:36	70,774	202,841,165	173,937,000	2,998,000	2,289,664
31	Mar 14, 2026 18:36	70,783	203,881,389	174,959,000	1,999,000	2,510,848
32	Mar 14, 2026 18:31	70,783	209,559,832	174,959,000	1,999,000	2,519,040
33	Mar 14, 2026 18:20	70,788	201,470,686	175,970,000	999,000	2,289,664
34	Mar 14, 2026 18:14	70,793	207,536,635	174,984,000	1,999,000	2,510,848
35	Mar 14, 2026 18:33	70,798	202,563,062	173,996,000	2,999,000	2,519,040
36	Mar 14, 2026 18:20	70,802	206,353,333	174,004,000	3,000,000	2,289,664
37	Mar 14, 2026 18:45	70,813	203,641,988	174,032,000	3,000,000	2,519,040
38	Mar 14, 2026 18:26	70,829	214,615,660	175,072,000	2,000,000	2,289,664
39	Mar 14, 2026 18:18	70,874	206,039,815	174,182,000	3,003,000	2,265,088
40	Mar 14, 2026 18:45	70,874	204,676,872	174,198,000	2,986,000	2,265,088
41	Mar 14, 2026 18:14	70,880	207,053,748	175,199,000	2,002,000	2,519,040
42	Mar 14, 2026 18:29	70,882	219,314,822	174,202,000	3,003,000	2,494,464
43	Mar 14, 2026 18:26	70,890	207,525,475	174,223,000	3,003,000	2,347,008
44	Mar 14, 2026 18:08	70,899	204,302,744	174,227,000	3,021,000	2,265,088
45	Mar 14, 2026 18:31	70,965	201,992,260	175,408,000	2,004,000	2,289,664
46	Mar 14, 2026 18:26	70,997	201,938,794	176,490,000	1,002,000	2,519,040
47	Mar 14, 2026 18:29	71,020	201,929,116	175,543,000	2,006,000	2,260,992
48	Mar 14, 2026 18:18	71,077	204,906,685	174,698,000	2,994,000	2,289,664

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