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
Mar 24, 2026 15:42	Dominique Garmier	CPPclang++18.1.3	Success	42,738
Mar 24, 2026 10:40	Dominique Garmier	RUSTrust-1.94.0	Success	45,932
Mar 24, 2026 10:37	Dominique Garmier	RUSTrust-1.94.0	Error
Mar 24, 2026 10:34	Dominique Garmier	RUSTrust-1.94.0	Error
Mar 24, 2026 03:51	olliecrow	RUSTrust-1.88.0	Success	7,164+40.49 RP
Mar 23, 2026 06:34	olliecrow	CPPclang++18.1.3	Success	7,592
Mar 23, 2026 00:45	olliecrow	RUSTrust-1.88.0	Success	7,378+100.36 RP
Mar 23, 2026 00:43	olliecrow	CPPclang++18.1.3	Success	7,968+93.98 RP
Mar 22, 2026 19:53	Dominique Garmier	ZIG0.13.0	Success	544,866+18.16 RP
Mar 22, 2026 19:28	Dominique Garmier	GOgo1.26.1	Success	75,397
Mar 22, 2026 19:03	Dominique Garmier	RUSTrust-1.94.0	Error
Mar 22, 2026 17:18	Dominique Garmier	GOgo1.26.1	Success	57,638
Mar 22, 2026 17:13	Dominique Garmier	GOgo1.26.1	Success	155,176
Mar 22, 2026 16:43	Dominique Garmier	RUSTrust-1.94.0	Success	139,415
Mar 22, 2026 16:29	Dominique Garmier	RUSTrust-1.94.0	Success	50,575
Mar 22, 2026 16:27	Dominique Garmier	GOgo1.26.1	Success	60,754
Mar 22, 2026 16:07	Dominique Garmier	GOgo1.26.1	Success	2,183,007
Mar 22, 2026 16:06	Dominique Garmier	GOgo1.26.1	Error
Mar 22, 2026 07:48	Dominique Garmier	CSHARP9.0.14	Success	82,458
Mar 21, 2026 21:12	Yuriy Lyfenko	CPPg++13.3.0	Success	3,743+12.79 RP
Mar 21, 2026 21:07	Yuriy Lyfenko	CPPg++13.3.0	Success	3,964
Mar 21, 2026 20:42	Yuriy Lyfenko	CPPclang++18.1.3	Success	4,040
Mar 21, 2026 20:42	Yuriy Lyfenko	CPPg++13.3.0	Success	3,842
Mar 21, 2026 20:29	Yuriy Lyfenko	CPPg++13.3.0	Success	3,794
Mar 21, 2026 20:20	Yuriy Lyfenko	CPPg++13.3.0	Success	3,772
Mar 21, 2026 20:18	Yuriy Lyfenko	CPPg++13.3.0	Success	3,761+167.59 RP
Mar 21, 2026 19:52	Dominique Garmier	GOgo1.26.1	Success	2,199,368
Mar 21, 2026 16:22	Dominique Garmier	RUSTrust-1.94.0	Success	18,651
Mar 21, 2026 14:07	Dominique Garmier	CPPg++13.3.0	Success	11,336
Mar 21, 2026 10:57	Dominique Garmier	GOgo1.26.1	Success	7,273,686
Mar 21, 2026 09:29	Dominique Garmier	ZIG0.13.0	Success	52,711,956
Mar 21, 2026 05:33	Josu San Martin	CPPg++13.3.0	Success	3,244
Mar 21, 2026 03:56	Dominique Garmier	CPPg++13.3.0	Success	11,224
Mar 20, 2026 12:24	Dominique Garmier	CPPclang++18.1.3	Success	8,780
Mar 20, 2026 11:32	Dominique Garmier	CPPg++13.3.0	Success	11,207
Mar 20, 2026 09:32	Dominique Garmier	CPPg++13.3.0	Success	11,389
Mar 20, 2026 08:08	Dominique Garmier	CPPclang++18.1.3	Success	8,774
Mar 20, 2026 07:49	Dominique Garmier	CPPclang++18.1.3	Success	8,826
Mar 20, 2026 03:11	Dominique Garmier	CPPclang++18.1.3	Success	8,844
Mar 20, 2026 00:31	Dominique Garmier	CPPclang++18.1.3	Success	8,782
Mar 19, 2026 22:16	Dominique Garmier	CPPclang++18.1.3	Success	8,766+2.60 RP
Mar 19, 2026 21:14	Jasper Edbrooke	CPPg++13.3.0	Success	1,137,758+8.79 RP
Mar 19, 2026 20:50	Dominique Garmier	CPPclang++18.1.3	Success	8,786+3.87 RP
Mar 19, 2026 20:49	Dominique Garmier	CPPclang++18.1.3	Success	8,816+8.68 RP
Mar 19, 2026 20:39	Dominique Garmier	CPPg++13.3.0	Success	11,699
Mar 19, 2026 20:37	Dominique Garmier	CPPg++13.3.0	Success	11,398
Mar 19, 2026 18:53	lipapipa	CPPg++13.3.0	Error
Mar 19, 2026 18:48	lipapipa	CPPg++13.3.0	Error
Mar 19, 2026 18:47	lipapipa	CPPg++13.3.0	Error
Mar 19, 2026 18:37	Dominique Garmier	CPPclang++18.1.3	Success	11,966
Mar 19, 2026 18:37	Dominique Garmier	CPPg++13.3.0	Success	15,461
Mar 19, 2026 17:53	Dominique Garmier	CPPg++13.3.0	Success	11,556
Mar 19, 2026 17:36	Dominique Garmier	CPPg++13.3.0	Success	11,624
Mar 19, 2026 17:36	Dominique Garmier	CPPclang++18.1.3	Success	9,374
Mar 19, 2026 16:43	Dominique Garmier	CPPclang++18.1.3	Success	8,888
Mar 19, 2026 16:42	Dominique Garmier	CPPclang++18.1.3	Success	9,040
Mar 19, 2026 16:11	Dominique Garmier	CPPclang++18.1.3	Success	12,068
Mar 19, 2026 16:06	Dominique Garmier	CPPg++13.3.0	Success	15,259
Mar 19, 2026 13:52	Dominique Garmier	CPPg++13.3.0	Success	11,432
Mar 19, 2026 13:50	Dominique Garmier	CPPg++13.3.0	Success	12,392
Mar 19, 2026 12:09	Dominique Garmier	CPPg++13.3.0	Success	12,399
Mar 19, 2026 12:09	Dominique Garmier	CPPclang++18.1.3	Success	9,645
Mar 19, 2026 12:05	Dominique Garmier	CPPclang++18.1.3	Success	9,008
Mar 19, 2026 11:57	Dominique Garmier	CPPg++13.3.0	Success	16,237
Mar 19, 2026 09:49	Dominique Garmier	CPPclang++18.1.3	Success	8,979
Mar 19, 2026 09:49	Dominique Garmier	CPPg++13.3.0	Success	11,300
Mar 19, 2026 09:38	Dominique Garmier	CPPclang++18.1.3	Success	8,884+1.77 RP
Mar 19, 2026 09:05	Dominique Garmier	CPPclang++18.1.3	Success	8,918
Mar 19, 2026 08:57	Dominique Garmier	CPPclang++18.1.3	Success	8,898+14.59 RP
Mar 19, 2026 08:42	Dominique Garmier	CPPclang++18.1.3	Success	9,015+241.96 RP
Mar 19, 2026 08:02	Dominique Garmier	CPPg++13.3.0	Success	11,530+165.35 RP
Mar 19, 2026 07:37	Dominique Garmier	CPPg++13.3.0	Success	14,246+3.48 RP
Mar 19, 2026 06:25	Dominique Garmier	CPPg++13.3.0	Success	14,317+2.09 RP
Mar 19, 2026 06:02	Dominique Garmier	CPPg++13.3.0	Success	14,517
Mar 19, 2026 02:04	Dominique Garmier	CPPg++13.3.0	Success	14,378
Mar 19, 2026 00:28	Dominique Garmier	CPPg++13.3.0	Success	14,360+7.96 RP
Mar 17, 2026 14:55	Dominique Garmier	CPPg++13.3.0	Success	15,478
Mar 16, 2026 22:23	Dominique Garmier	CPPg++13.3.0	Success	14,526+41.17 RP
Mar 16, 2026 14:21	Dominique Garmier	CPPg++13.3.0	Success	15,894
Mar 16, 2026 11:37	Dominique Garmier	CPPg++13.3.0	Success	15,821
Mar 16, 2026 11:02	Dominique Garmier	CPPg++13.3.0	Success	15,750
Mar 16, 2026 10:56	Dominique Garmier	CPPg++13.3.0	Success	15,594
Mar 16, 2026 10:52	Dominique Garmier	CPPg++13.3.0	Success	15,450+8.03 RP
Mar 15, 2026 21:52	Elijah Kin	CPPclang++18.1.3	Error
Mar 15, 2026 21:14	Elijah Kin	CPPclang++18.1.3	Success	12,982
Mar 15, 2026 21:07	Elijah Kin	CPPclang++18.1.3	Success	13,019
Mar 15, 2026 12:42	Dominique Garmier	CPPg++13.3.0	Success	15,644+310.94 RP
Mar 15, 2026 11:22	Dominique Garmier	CPPclang++18.1.3	Success	51,118
Mar 15, 2026 11:14	Dominique Garmier	CPPg++13.3.0	Success	43,155
Mar 15, 2026 10:52	Dominique Garmier	CPPclang++18.1.3	Success	34,772
Mar 15, 2026 07:56	Elijah Kin	CPPclang++18.1.3	Error
Mar 15, 2026 07:54	Elijah Kin	CPPclang++18.1.3	Error
Mar 15, 2026 07:34	Elijah Kin	CPPclang++18.1.3	Success	12,914
Mar 15, 2026 07:25	Elijah Kin	CPPclang++18.1.3	Success	12,770
Mar 15, 2026 07:19	Elijah Kin	CPPclang++18.1.3	Success	29,863
Mar 15, 2026 07:11	Elijah Kin	CPPclang++18.1.3	Error
Mar 15, 2026 07:07	Elijah Kin	CPPclang++18.1.3	Error
Mar 15, 2026 06:52	Elijah Kin	CPPclang++18.1.3	Error
Mar 15, 2026 06:40	Elijah Kin	CPPclang++18.1.3	Error
Mar 15, 2026 06:26	Elijah Kin	CPPclang++18.1.3	Success	12,920

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