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
Jan 29, 2025 14:06	Keefe	CPPclang++18.1.3	Error
Jan 29, 2025 11:43	Keefe	CPPclang++18.1.3	Success	41,514+240.88 RP
Jan 29, 2025 11:34	Keefe	CPPclang++18.1.3	Error
Jan 29, 2025 11:14	Haha Expert	CPPg++13.2.0	Success	1,137,544+0.88 RP
Jan 29, 2025 11:11	Haha Expert	CPPclang++18.1.3	Success	1,265,810
Jan 27, 2025 19:28	Oleg Kovalov	CPPclang++18.1.3	Success	3,247,491
Jan 22, 2025 05:00	Ian Mckibben	CPPg++13.2.0	Error
Jan 22, 2025 04:05	Ian Mckibben	CPPg++13.2.0	Success	342,578+19.24 RP
Jan 20, 2025 16:04	Oleg Kovalov	GOgo1.23.5	Success	1,112,101+2.94 RP
Jan 18, 2025 04:01	Ian Mckibben	CPPg++13.2.0	Success	1,005,413+2.04 RP
Jan 18, 2025 04:00	Ian Mckibben	CPPclang++18.1.3	Success	1,264,408+7.91 RP
Dec 30, 2024 00:01	Joad Nacer	CPPclang++18.1.3	Error
Dec 30, 2024 00:00	Joad Nacer	CPPclang++18.1.3	Error
Dec 29, 2024 21:01	Joad Nacer	CPPclang++18.1.3	Success	103,242
Dec 29, 2024 21:00	Joad Nacer	CPPclang++18.1.3	Success	104,390
Dec 29, 2024 21:00	Joad Nacer	CPPg++13.2.0	Success	105,372
Dec 22, 2024 23:39	HighloadGPTO1	CPPg++13.2.0	Success	349,082+8.30 RP
Dec 22, 2024 23:39	HighloadGPTO1	CPPclang++18.1.3	Success	491,476+20.35 RP
Dec 16, 2024 12:17	Haha Expert	CSHARP9.0.0	Error
Dec 13, 2024 00:23	Joad Nacer	CPPg++13.2.0	Error
Dec 13, 2024 00:22	Joad Nacer	CPPg++13.2.0	Error
Dec 13, 2024 00:22	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 23:58	Joad Nacer	CPPg++13.2.0	Success	31,985+7.19 RP
Dec 12, 2024 23:58	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 23:56	Joad Nacer	CPPg++13.2.0	Success	33,795
Dec 12, 2024 23:50	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 23:49	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 23:48	Joad Nacer	CPPg++13.2.0	Success	32,831
Dec 12, 2024 23:46	Joad Nacer	CPPg++13.2.0	Success	32,747
Dec 12, 2024 23:46	Joad Nacer	CPPg++13.2.0	Success	32,738+2.08 RP
Dec 12, 2024 23:43	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 23:42	Joad Nacer	CPPclang++18.1.3	Error
Dec 12, 2024 23:39	Joad Nacer	CPPclang++18.1.3	Error
Dec 12, 2024 23:39	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 23:38	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 23:34	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 23:19	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 23:18	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 19:02	Yuriy Lyfenko	CPPg++13.2.0	Success	55,002
Dec 12, 2024 19:00	Yuriy Lyfenko	CPPclang++18.1.3	Success	1,263,060
Dec 12, 2024 00:25	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 00:01	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 00:00	Joad Nacer	CPPg++13.2.0	Error
Dec 12, 2024 00:00	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 19:01	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 19:01	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 19:00	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 18:59	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 18:58	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 18:57	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 18:55	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 18:07	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 18:04	Joad Nacer	CPPg++13.2.0	Error
Dec 11, 2024 18:00	Joad Nacer	CPPg++13.2.0	Error
Dec 10, 2024 23:51	Joad Nacer	CPPg++13.2.0	Error
Dec 10, 2024 23:42	Joad Nacer	CPPg++13.2.0	Success	53,224
Dec 10, 2024 23:41	Joad Nacer	CPPg++13.2.0	Success	88,136
Dec 10, 2024 23:41	Joad Nacer	CPPg++13.2.0	Success	46,758
Dec 10, 2024 23:40	Joad Nacer	CPPg++13.2.0	Success	32,963+11.09 RP
Dec 10, 2024 23:40	Joad Nacer	CPPg++13.2.0	Success	34,398
Dec 8, 2024 06:52	E Sequeira	CPPg++13.2.0	Error
Dec 8, 2024 06:50	E Sequeira	CPPg++13.2.0	Success	312,217
Dec 8, 2024 06:49	E Sequeira	CPPclang++18.1.3	Success	401,727
Dec 8, 2024 06:48	E Sequeira	CPPclang++18.1.3	Success	401,605
Dec 8, 2024 06:47	E Sequeira	CPPg++13.2.0	Success	311,272+0.01 RP
Dec 5, 2024 13:17	Yingxin Jiang	CPPclang++18.1.3	Success	1,262,648+7.92 RP
Nov 30, 2024 04:14	Haha Expert	CSHARP9.0.0-rc.2	Error
Nov 29, 2024 22:46	E Sequeira	CPPg++13.2.0	Error
Nov 29, 2024 22:39	E Sequeira	GOgo1.23.3	Error
Nov 29, 2024 22:36	E Sequeira	GOgo1.23.3	Success	1,556,323
Nov 29, 2024 22:36	E Sequeira	GOgo1.23.3	Error
Nov 29, 2024 22:33	E Sequeira	GOgo1.23.3	Error
Nov 29, 2024 22:32	E Sequeira	GOgo1.23.3	Error
Nov 29, 2024 22:31	E Sequeira	GOgo1.23.3	Error
Nov 29, 2024 22:29	E Sequeira	GOgo1.23.3	Success	1,533,737
Nov 29, 2024 22:28	E Sequeira	GOgo1.23.3	Error
Nov 29, 2024 22:26	E Sequeira	GOgo1.23.3	Error
Nov 29, 2024 22:24	E Sequeira	GOgo1.23.3	Success	1,232,464
Nov 29, 2024 22:23	E Sequeira	GOgo1.23.3	Error
Nov 29, 2024 22:22	E Sequeira	GOgo1.23.3	Error
Nov 29, 2024 03:17	Haha Expert	CSHARP9.0.0	Error
Nov 29, 2024 03:15	Haha Expert	CSHARP9.0.0	Error
Nov 27, 2024 15:53	Joad Nacer	CPPg++13.2.0	Success	34,422
Nov 27, 2024 15:52	Joad Nacer	CPPg++13.2.0	Success	34,298
Nov 27, 2024 15:52	Joad Nacer	CPPg++13.2.0	Success	34,870
Nov 27, 2024 15:51	Joad Nacer	CPPg++13.2.0	Success	34,873
Nov 27, 2024 15:49	Joad Nacer	CPPg++13.2.0	Success	34,341
Nov 27, 2024 15:49	Joad Nacer	CPPg++13.2.0	Success	34,214+0.12 RP
Nov 27, 2024 15:48	Joad Nacer	CPPg++13.2.0	Success	34,228+0.24 RP
Nov 27, 2024 15:47	Joad Nacer	CPPclang++18.1.3	Success	40,490
Nov 27, 2024 15:46	Joad Nacer	CPPg++13.2.0	Success	34,256+283.50 RP
Nov 27, 2024 01:08	Joad Nacer	CPPclang++18.1.3	Error
Nov 27, 2024 01:08	Joad Nacer	CPPclang++18.1.3	Error
Nov 27, 2024 01:08	Joad Nacer	CPPclang++18.1.3	Error
Nov 27, 2024 01:07	Joad Nacer	CPPclang++18.1.3	Error
Nov 27, 2024 01:07	Joad Nacer	CPPclang++18.1.3	Error
Nov 27, 2024 01:06	Joad Nacer	CPPclang++18.1.3	Error
Nov 27, 2024 01:02	Joad Nacer	CPPclang++18.1.3	Error
Nov 27, 2024 01:01	Joad Nacer	CPPclang++18.1.3	Error
Nov 27, 2024 00:59	Joad Nacer	CPPclang++18.1.3	Error

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