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 18:54

Dominique GarmierScore: 30,462Success

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Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 14, 2026 18:50	30,412	106,682,987	74,029,000	2,000,000	2,260,992
2	Mar 14, 2026 23:09	30,421	101,990,540	73,051,000	3,002,000	2,260,992
3	Mar 15, 2026 11:05	30,425	101,261,130	74,062,000	2,001,000	2,510,848
4	Mar 14, 2026 18:50	30,426	101,979,485	74,065,000	2,001,000	2,281,472
5	Mar 14, 2026 23:26	30,428	107,657,342	73,068,000	3,002,000	2,519,040
6	Mar 14, 2026 19:21	30,435	108,107,933	73,085,000	3,003,000	2,510,848
7	Mar 14, 2026 18:57	30,436	101,331,021	73,087,000	3,003,000	2,519,040
8	Mar 14, 2026 19:04	30,441	100,986,160	73,099,000	3,004,000	2,289,664
9	Mar 14, 2026 18:57	30,442	107,661,235	74,104,000	2,002,000	2,519,040
10	Mar 14, 2026 19:21	30,448	98,886,173	73,116,000	3,004,000	2,289,664
11	Mar 14, 2026 18:50	30,452	105,443,233	73,125,000	3,005,000	2,265,088
12	Mar 14, 2026 18:50	30,452	104,889,051	74,128,000	2,003,000	2,400,256
13	Mar 14, 2026 19:09	30,452	108,562,221	73,126,000	3,005,000	2,289,664
14	Mar 14, 2026 19:09	30,456	100,346,801	73,136,000	3,005,000	2,289,664
15	Mar 14, 2026 23:09	30,460	105,588,666	74,146,000	2,003,000	2,519,040
16	Mar 14, 2026 23:09	30,462	100,739,987	73,148,000	3,006,000	2,510,848
17	Mar 14, 2026 19:04	30,462	101,815,557	74,152,000	2,004,000	2,510,848
18	Mar 14, 2026 19:09	30,474	98,745,663	73,177,000	3,007,000	2,371,584
19	Mar 14, 2026 18:50	30,476	101,724,099	73,183,000	3,007,000	2,351,104
20	Mar 14, 2026 19:04	30,480	102,504,173	74,194,000	2,005,000	2,289,664
21	Mar 15, 2026 11:05	30,480	107,661,126	74,195,000	2,005,000	2,265,088
22	Mar 14, 2026 18:50	30,482	106,515,862	74,201,000	2,005,000	2,265,088
23	Mar 14, 2026 18:50	30,487	98,662,179	74,212,000	2,005,000	2,289,664
24	Mar 14, 2026 18:57	30,488	101,333,343	74,215,000	2,005,000	2,289,664
25	Mar 14, 2026 18:50	30,490	102,494,277	74,219,000	2,005,000	2,289,664
26	Mar 14, 2026 18:50	30,510	97,384,729	74,267,000	2,007,000	2,289,664
27	Mar 15, 2026 11:05	30,511	98,938,123	73,267,000	3,010,000	2,289,664
28	Mar 14, 2026 18:54	30,522	96,632,095	73,294,000	3,012,000	2,367,488
29	Mar 14, 2026 23:26	30,550	96,682,494	73,360,000	3,014,000	2,289,664
30	Mar 14, 2026 19:21	30,554	98,931,581	74,375,000	2,010,000	2,289,664
31	Mar 14, 2026 23:26	30,567	99,678,596	73,401,000	3,016,000	2,289,664
32	Mar 14, 2026 18:54	30,584	105,486,748	73,441,000	3,018,000	2,260,992
33	Mar 14, 2026 18:54	30,753	109,873,660	73,888,000	2,995,000	2,289,664

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