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
Jun 29, 2025 21:53	Aniruddha Deb	CPPg++13.3.0	Error
Jun 28, 2025 12:41	T Pratham	CPPg++13.3.0	Error
Jun 28, 2025 12:27	T Pratham	CPPg++13.3.0	Error
Jun 28, 2025 11:33	T Pratham	CPPg++13.3.0	Error
Jun 28, 2025 09:08	T Pratham	CPPg++13.3.0	Error
Jun 28, 2025 08:42	T Pratham	CPPg++13.3.0	Error
Jun 27, 2025 19:49	T Pratham	CPPg++13.3.0	Error
Jun 27, 2025 19:47	T Pratham	CPPg++13.3.0	Error
Jun 27, 2025 19:45	T Pratham	CPPg++13.3.0	Error
Jun 27, 2025 17:58	T Pratham	CPPg++13.3.0	Error
Jun 27, 2025 17:49	T Pratham	CPPg++13.3.0	Error
Jun 27, 2025 17:38	T Pratham	CPPg++13.3.0	Error
Jun 27, 2025 17:34	T Pratham	CPPg++13.3.0	Error
Jun 27, 2025 17:16	T Pratham	CPPg++13.3.0	Error
Jun 24, 2025 13:29	T Pratham	CPPg++13.3.0	Error
Jun 24, 2025 13:05	T Pratham	CPPg++13.3.0	Error
Jun 24, 2025 11:59	T Pratham	CPPg++13.3.0	Error
Jun 24, 2025 11:58	T Pratham	CPPg++13.3.0	Error
Jun 21, 2025 20:49	Aniruddha Deb	CPPg++13.3.0	Error
May 31, 2025 15:41	Keefe	CPPclang++18.1.3	Success	23,668
May 10, 2025 14:09	Keefe	CPPg++13.3.0	Error
May 10, 2025 13:57	Keefe	CPPg++13.3.0	Success	18,475+50.69 RP
May 3, 2025 04:00	Keefe	CPPg++13.3.0	Success	20,384+5.21 RP
May 3, 2025 03:57	Keefe	CPPg++13.3.0	Success	26,475
May 3, 2025 03:53	Keefe	CPPg++13.3.0	Error
Apr 20, 2025 08:18	Aniruddha Deb	CPPg++13.2.0	Success	15,535
Apr 20, 2025 08:13	Aniruddha Deb	CPPg++13.2.0	Success	15,491+645.54 RP
Apr 19, 2025 16:59	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 16:59	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 16:57	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 16:40	Aniruddha Deb	CPPg++13.2.0	Error
Apr 19, 2025 15:59	Aniruddha Deb	CPPg++13.2.0	Error
Apr 19, 2025 15:48	Aniruddha Deb	CPPg++13.2.0	Error
Apr 19, 2025 14:58	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 14:53	Aniruddha Deb	CPPg++13.2.0	Error
Apr 19, 2025 14:52	Aniruddha Deb	CPPg++13.2.0	Error
Apr 19, 2025 14:45	Aniruddha Deb	CPPg++13.2.0	Error
Apr 19, 2025 14:41	Aniruddha Deb	CPPg++13.2.0	Error
Apr 19, 2025 14:41	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 14:39	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 14:36	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 14:35	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 14:32	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 14:31	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 14:14	Yuriy Lyfenko	CPPg++13.2.0	Error
Apr 19, 2025 14:10	Yuriy Lyfenko	CPPg++13.2.0	Error
Apr 19, 2025 14:09	Yuriy Lyfenko	CPPg++13.2.0	Error
Apr 19, 2025 14:06	Yuriy Lyfenko	CPPg++13.2.0	Error
Apr 19, 2025 14:05	Yuriy Lyfenko	CPPg++13.2.0	Error
Apr 19, 2025 02:04	Keefe	RUSTrust-1.86.0	Success	23,133+99.55 RP
Apr 19, 2025 01:57	Keefe	GOgo1.24.2	Success	26,496+3.32 RP
Apr 19, 2025 01:54	Keefe	CPPg++13.2.0	Error
Apr 19, 2025 01:53	Keefe	CPPg++13.2.0	Success	20,603+111.27 RP
Apr 19, 2025 01:50	Keefe	GOgo1.24.2	Success	26,731+25.50 RP
Apr 19, 2025 01:49	Keefe	GOgo1.24.2	Success	27,674+83.45 RP
Apr 19, 2025 01:45	ethereal	GOgo1.24.2	Error
Apr 19, 2025 01:38	ethereal	GOgo1.24.2	Success	40,551+246.60 RP
Apr 9, 2025 17:47	NoSIMD_C#	CSHARP9.0.4	Success	82,117+0.58 RP
Apr 8, 2025 07:21	NoSIMD_C#	CPPg++13.2.0	Success	1,003,521
Apr 4, 2025 08:18	NoSIMD_C#	CSHARP9.0.3	Success	82,310+4.64 RP
Apr 4, 2025 08:12	NoSIMD_C#	CSHARP9.0.3	Success	83,914+110.38 RP
Apr 4, 2025 08:08	NoSIMD_C#	CSHARP9.0.3	Error
Apr 4, 2025 08:03	NoSIMD_C#	CSHARP9.0.3	Error
Apr 3, 2025 10:26	NoSIMD_C#	CPPg++13.2.0	Success	1,137,456
Apr 3, 2025 10:25	NoSIMD_C#	RUSTrust-1.86.0	Success	1,262,207
Mar 10, 2025 10:13	Jeremy Lim	CPPg++13.2.0	Error
Mar 10, 2025 10:11	Jeremy Lim	CPPg++13.2.0	Error
Mar 10, 2025 10:05	Jeremy Lim	CPPg++13.2.0	Error
Mar 10, 2025 09:55	Jeremy Lim	CPPg++13.2.0	Error
Mar 10, 2025 09:53	Jeremy Lim	CPPg++13.2.0	Error
Mar 7, 2025 22:52	Keefe	CPPclang++18.1.3	Success	49,313
Feb 19, 2025 20:54	Ian Mckibben	CPPg++13.2.0	Success	324,016+0.01 RP
Feb 19, 2025 20:53	Ian Mckibben	CPPg++13.2.0	Error
Feb 19, 2025 20:52	Ian Mckibben	CPPg++13.2.0	Error
Feb 19, 2025 20:52	Ian Mckibben	CPPg++13.2.0	Error
Feb 19, 2025 20:51	Ian Mckibben	CPPg++13.2.0	Success	341,825
Feb 19, 2025 20:50	Ian Mckibben	CPPg++13.2.0	Error
Feb 19, 2025 20:49	Ian Mckibben	CPPg++13.2.0	Error
Feb 19, 2025 20:48	Ian Mckibben	CPPg++13.2.0	Success	324,084+1.65 RP
Feb 19, 2025 20:47	Ian Mckibben	CPPg++13.2.0	Success	342,451
Feb 19, 2025 20:47	Ian Mckibben	CPPg++13.2.0	Error
Feb 19, 2025 20:46	Ian Mckibben	CPPg++13.2.0	Error
Feb 19, 2025 20:45	Ian Mckibben	CPPg++13.2.0	Success	343,409
Feb 19, 2025 20:45	Ian Mckibben	CPPclang++18.1.3	Success	505,552
Feb 19, 2025 09:21	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 09:20	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 09:06	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 09:05	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 09:04	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 08:59	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 08:43	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 08:33	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 08:26	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 07:44	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 07:37	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 07:36	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 07:35	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 07:34	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 07:33	Ian Mckibben	CPPclang++18.1.3	Error
Feb 19, 2025 07:33	Ian Mckibben	CPPclang++18.1.3	Error

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