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.

Date	Author	Language	Status	Score
Jul 12, 2023 17:17	Bernard Teo	CPPg++9.3.0	Success	37,217
Jul 12, 2023 17:17	Bernard Teo	CPPg++9.3.0	Success	35,248
Jul 12, 2023 17:16	Bernard Teo	CPPg++9.3.0	Success	36,199
Jul 12, 2023 17:13	Bernard Teo	CPPg++9.3.0	Success	36,626
Jul 11, 2023 17:39	Bernard Teo	CPPg++9.3.0	Success	35,152
Jul 11, 2023 17:24	Bernard Teo	CPPg++9.3.0	Success	31,554
Jul 10, 2023 19:58	Yuriy Lyfenko	CPPg++9.3.0	Error
Jul 10, 2023 19:57	Yuriy Lyfenko	CPPg++9.3.0	Error
Jul 10, 2023 18:23	Yuriy Lyfenko	CPPg++9.3.0	Success	546,120
Jul 10, 2023 18:22	Yuriy Lyfenko	CPPg++9.3.0	Success	588,408
Jul 10, 2023 17:50	Yuriy Lyfenko	CPPg++9.3.0	Success	574,187
Jul 10, 2023 17:40	Yuriy Lyfenko	CPPg++9.3.0	Success	546,116
Jul 10, 2023 17:27	Yuriy Lyfenko	CPPg++9.3.0	Success	546,142+11.96 RP
Jul 10, 2023 17:26	Yuriy Lyfenko	CPPg++9.3.0	Success	1,851,645
Jul 10, 2023 17:15	Yuriy Lyfenko	CPPg++9.3.0	Error
Jul 10, 2023 17:06	Yuriy Lyfenko	CPPg++9.3.0	Error
Jul 10, 2023 17:05	Yuriy Lyfenko	CPPg++9.3.0	Error
Jul 10, 2023 13:31	Yuriy Lyfenko	CPPg++9.3.0	Success	1,573,659
Jul 10, 2023 13:30	Yuriy Lyfenko	CPPg++9.3.0	Success	4,024,005
Jul 10, 2023 13:28	Yuriy Lyfenko	CPPg++9.3.0	Success	1,574,304
Jul 10, 2023 13:26	Yuriy Lyfenko	CPPg++9.3.0	Success	1,574,857
Jul 10, 2023 13:06	Yuriy Lyfenko	CPPg++9.3.0	Error
Jul 10, 2023 13:00	Yuriy Lyfenko	CPPg++9.3.0	Error
Jul 10, 2023 11:11	matsuoka-601	CPPg++9.3.0	Error
Jul 10, 2023 10:40	matsuoka-601	CPPg++9.3.0	Error
Jul 10, 2023 09:37	matsuoka-601	CPPg++9.3.0	Error
Jul 10, 2023 09:30	matsuoka-601	CPPg++9.3.0	Error
Jul 10, 2023 08:40	gchebanov	CPPg++9.3.0	Success	6,954+1'447.36 RP
Jul 10, 2023 01:30	Robert Burke	CPPg++9.3.0	Success	1,651,906+6.05 RP
Jul 10, 2023 01:02	Yuriy Lyfenko	CPPg++9.3.0	Success	1,574,940+6.35 RP
Jul 9, 2023 23:21	gchebanov	CPPg++9.3.0	Success	13,999+26.64 RP
Jul 9, 2023 23:20	gchebanov	CPPclang++10.0.0	Success	18,432
Jul 9, 2023 23:19	gchebanov	CPPg++9.3.0	Success	14,265+213.96 RP
Jul 9, 2023 23:08	gchebanov	CPPg++9.3.0	Success	16,834+157.10 RP
Jul 9, 2023 23:05	gchebanov	CPPg++9.3.0	Success	19,994
Jul 9, 2023 22:59	gchebanov	CPPclang++10.0.0	Success	33,678
Jul 9, 2023 22:21	gchebanov	CPPclang++10.0.0	Success	22,104
Jul 9, 2023 22:21	gchebanov	CPPg++9.3.0	Success	19,399+321.86 RP
Jul 9, 2023 22:10	gchebanov	CPPg++9.3.0	Success	28,204+383.98 RP
Jul 9, 2023 21:19	gchebanov	CPPg++9.3.0	Success	2,118,709
Jul 9, 2023 21:17	gchebanov	CPPg++9.3.0	Error
Jul 9, 2023 21:13	gchebanov	CPPg++9.3.0	Error
Jul 9, 2023 21:08	gchebanov	CPPg++9.3.0	Success	1,345,983+7.43 RP
Jul 9, 2023 20:59	gchebanov	CPPg++9.3.0	Error
Jul 9, 2023 18:30	Bernard Teo	CPPg++9.3.0	Success	31,475+47.38 RP
Jul 9, 2023 18:30	Bernard Teo	CPPg++9.3.0	Success	34,011+574.07 RP
Jul 9, 2023 18:29	Bernard Teo	RUSTrust-1.70.0	Success	1,262,258+1.87 RP
Jul 9, 2023 18:29	Bernard Teo	CPPg++9.3.0	Success	1,652,013+6.05 RP

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