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	1:20.1.2-0ubuntu1~24.04.3	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	3.0.13-0ubuntu3.11	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.

Date	Author	Language	Status	Score
Apr 13, 2026 15:04	limanjun99	CPPg++13.3.0	Success	3,048
Apr 13, 2026 14:58	limanjun99	CPPg++13.3.0	Success	3,065
Apr 13, 2026 14:56	limanjun99	CPPg++13.3.0	Success	3,166
Apr 13, 2026 14:43	limanjun99	CPPg++13.3.0	Success	3,165
Apr 13, 2026 14:41	limanjun99	CPPg++13.3.0	Success	3,038+8.65 RP
Apr 13, 2026 14:31	limanjun99	CPPg++13.3.0	Success	3,170
Apr 13, 2026 13:59	limanjun99	CPPg++13.3.0	Success	3,046+3.23 RP
Apr 13, 2026 13:52	limanjun99	CPPg++13.3.0	Success	3,167
Apr 13, 2026 13:50	limanjun99	CPPg++13.3.0	Success	3,049+60.19 RP
Apr 13, 2026 13:49	limanjun99	CPPg++13.3.0	Success	3,116
Apr 13, 2026 13:24	limanjun99	CPPg++13.3.0	Success	3,168
Apr 13, 2026 13:23	limanjun99	CPPg++13.3.0	Success	3,167
Apr 13, 2026 13:23	limanjun99	CPPg++13.3.0	Success	3,162
Apr 13, 2026 11:45	limanjun99	CPPg++13.3.0	Success	3,108
Apr 13, 2026 11:45	limanjun99	CPPg++13.3.0	Success	3,168
Apr 13, 2026 11:43	limanjun99	CPPg++13.3.0	Success	3,218
Apr 13, 2026 11:32	limanjun99	CPPg++13.3.0	Success	3,892
Apr 13, 2026 11:30	limanjun99	CPPg++13.3.0	Success	3,827
Apr 13, 2026 11:17	limanjun99	CPPg++13.3.0	Success	3,575
Apr 13, 2026 10:12	limanjun99	CPPg++13.3.0	Success	3,215
Apr 13, 2026 10:07	limanjun99	CPPg++13.3.0	Success	3,112
Apr 13, 2026 09:23	limanjun99	CPPg++13.3.0	Success	3,107
Apr 13, 2026 09:23	limanjun99	CPPg++13.3.0	Success	3,165
Apr 13, 2026 09:18	limanjun99	CPPg++13.3.0	Success	3,219
Apr 13, 2026 09:08	limanjun99	CPPg++13.3.0	Success	3,180
Apr 13, 2026 08:45	limanjun99	CPPg++13.3.0	Success	3,106+61.02 RP
Apr 13, 2026 08:43	limanjun99	CPPg++13.3.0	Success	3,166+220.84 RP
Apr 13, 2026 08:42	limanjun99	CPPg++13.3.0	Success	3,452
Apr 13, 2026 08:40	limanjun99	CPPg++13.3.0	Success	3,429
Apr 13, 2026 08:39	limanjun99	CPPg++13.3.0	Success	3,427
Apr 13, 2026 08:36	limanjun99	CPPg++13.3.0	Success	3,404+12.03 RP
Apr 13, 2026 08:22	limanjun99	CPPg++13.3.0	Success	3,474
Apr 13, 2026 08:22	limanjun99	CPPg++13.3.0	Success	3,444
Apr 13, 2026 08:21	limanjun99	CPPg++13.3.0	Success	3,442
Apr 13, 2026 08:16	limanjun99	CPPg++13.3.0	Success	3,444
Apr 13, 2026 08:12	limanjun99	CPPg++13.3.0	Success	3,418+367.49 RP
Apr 13, 2026 08:05	limanjun99	CPPg++13.3.0	Success	3,909+34.86 RP
Apr 13, 2026 07:39	limanjun99	CPPg++13.3.0	Success	4,167
Apr 13, 2026 07:38	limanjun99	CPPg++13.3.0	Success	4,367
Apr 13, 2026 05:51	limanjun99	CPPg++13.3.0	Success	4,515
Apr 13, 2026 05:27	limanjun99	CPPg++13.3.0	Success	3,963+118.34 RP
Apr 13, 2026 05:22	limanjun99	CPPg++13.3.0	Success	6,178
Apr 13, 2026 05:13	limanjun99	CPPg++13.3.0	Success	4,198
Apr 13, 2026 05:06	limanjun99	CPPg++13.3.0	Success	4,191
Apr 13, 2026 05:06	limanjun99	CPPg++13.3.0	Success	4,162
Apr 13, 2026 04:55	limanjun99	CPPg++13.3.0	Success	4,158+84.82 RP
Apr 13, 2026 04:54	limanjun99	CPPg++13.3.0	Success	4,310+1'546.31 RP
Apr 12, 2026 15:19	limanjun99	CPPg++13.3.0	Success	12,922+19.90 RP
Apr 12, 2026 15:17	limanjun99	CPPg++13.3.0	Success	13,263+403.59 RP
Apr 12, 2026 15:10	limanjun99	CPPg++13.3.0	Success	28,540+88.41 RP
Apr 12, 2026 15:00	limanjun99	CPPg++13.3.0	Success	38,171+1.72 RP
Apr 12, 2026 14:50	limanjun99	CPPg++13.3.0	Success	38,432
Apr 12, 2026 14:46	limanjun99	CPPg++13.3.0	Success	38,424+0.57 RP
Apr 12, 2026 14:45	limanjun99	CPPg++13.3.0	Success	103,717
Apr 12, 2026 14:32	limanjun99	CPPg++13.3.0	Success	38,612
Apr 12, 2026 14:25	limanjun99	CPPg++13.3.0	Success	38,509+0.20 RP
Apr 12, 2026 14:12	limanjun99	CPPg++13.3.0	Success	46,837
Apr 12, 2026 14:12	limanjun99	CPPg++13.3.0	Success	38,539+9.33 RP
Apr 12, 2026 13:49	limanjun99	CPPg++13.3.0	Success	49,124
Apr 12, 2026 13:48	limanjun99	CPPg++13.3.0	Success	41,933
Apr 12, 2026 13:48	limanjun99	CPPg++13.3.0	Success	39,977+100.97 RP
Apr 12, 2026 13:39	limanjun99	CPPg++13.3.0	Success	73,862
Apr 12, 2026 13:38	limanjun99	CPPg++13.3.0	Success	67,035+4.60 RP
Apr 12, 2026 13:38	limanjun99	CPPg++13.3.0	Success	69,168+131.32 RP
Apr 12, 2026 04:26	limanjun99	CPPg++13.3.0	Success	754,136
Apr 12, 2026 04:26	limanjun99	CPPg++13.3.0	Success	754,398+13.26 RP
Apr 9, 2026 17:51	olliecrow	ZIG0.14.0	Success	8,265+613.05 RP
Apr 9, 2026 15:47	olliecrow	RUSTrust-1.94.0	Success	5,750
Apr 9, 2026 13:28	olliecrow	CSHARP9.0.14	Success	38,899+135.30 RP
Apr 9, 2026 12:41	olliecrow	RUSTrust-1.94.0	Success	5,716+353.61 RP
Apr 6, 2026 20:02	olliecrow	CPPg++13.3.0	Success	28,461
Apr 6, 2026 18:56	olliecrow	CPPg++13.3.0	Success	15,768
Apr 6, 2026 15:15	olliecrow	CPPg++13.3.0	Success	28,381
Apr 6, 2026 14:23	olliecrow	CPPg++13.3.0	Success	9,305
Mar 30, 2026 07:14	Dominique Garmier	RUSTrust-1.94.1	Success	21,896
Mar 30, 2026 05:52	Dominique Garmier	RUSTrust-1.94.1	Success	29,281
Mar 30, 2026 05:21	Dominique Garmier	RUSTrust-1.94.1	Success	21,246
Mar 30, 2026 05:20	Dominique Garmier	RUSTrust-1.94.1	Success	35,242
Mar 30, 2026 05:18	Dominique Garmier	RUSTrust-1.94.1	Success	66,891
Mar 30, 2026 00:44	Dominique Garmier	RUSTrust-1.94.1	Success	9,440
Mar 29, 2026 23:39	Dominique Garmier	RUSTrust-1.94.1	Success	214,932
Mar 29, 2026 23:05	Dominique Garmier	RUSTrust-1.94.1	Error
Mar 29, 2026 23:04	Dominique Garmier	RUSTrust-1.94.1	Error
Mar 29, 2026 08:00	Dominique Garmier	CPPclang++18.1.3	Success	9,014
Mar 28, 2026 10:46	Dominique Garmier	RUSTrust-1.94.0	Success	9,385
Mar 27, 2026 16:58	Dominique Garmier	ZIG0.13.0	Success	16,754+8.98 RP
Mar 27, 2026 02:40	Dominique Garmier	GOgo1.26.1	Success	49,812
Mar 27, 2026 02:34	Dominique Garmier	GOgo1.26.1	Success	89,224
Mar 27, 2026 02:33	Dominique Garmier	GOgo1.26.1	Success	48,121
Mar 26, 2026 13:11	Dominique Garmier	CPPclang++18.1.3	Success	8,384+51.98 RP
Mar 26, 2026 10:58	Dominique Garmier	RUSTrust-1.94.0	Success	49,578
Mar 25, 2026 21:55	Dominique Garmier	RUSTrust-1.94.0	Error
Mar 25, 2026 20:29	Dominique Garmier	ZIG0.13.0	Success	211,802
Mar 25, 2026 20:00	Dominique Garmier	ZIG0.13.0	Success	17,010+521.43 RP
Mar 25, 2026 18:47	Dominique Garmier	ZIG0.13.0	Success	5,715,006
Mar 25, 2026 16:15	Dominique Garmier	ZIG0.13.0	Success	150,473+48.10 RP
Mar 24, 2026 19:33	Dominique Garmier	CPPclang++18.1.3	Success	22,420
Mar 24, 2026 19:28	Dominique Garmier	CPPclang++18.1.3	Success	41,896
Mar 24, 2026 16:43	Dominique Garmier	RUSTrust-1.94.0	Success	9,342
Mar 24, 2026 16:19	Dominique Garmier	RUSTrust-1.94.0	Success	9,591

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