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
Jun 10, 2026 22:34	Victor Mercklé	CSHARP10.0.7	Success	3,692
Jun 10, 2026 22:28	Victor Mercklé	CSHARP10.0.7	Success	3,572+31.00 RP
Jun 10, 2026 21:14	Victor Mercklé	ZIG0.16.0	Success	17,908
Jun 10, 2026 21:06	Victor Mercklé	ZIG0.16.0	Success	25,667
Jun 10, 2026 20:56	Victor Mercklé	ZIG0.16.0	Success	25,355
Jun 10, 2026 18:10	Victor Mercklé	GOgo1.26.2	Success	3,134+107.25 RP
Jun 10, 2026 18:00	Victor Mercklé	GOgo1.26.2	Success	3,259
Jun 10, 2026 09:24	Victor Mercklé	GOgo1.26.2	Success	3,243+10.42 RP
Jun 10, 2026 09:19	Victor Mercklé	GOgo1.26.2	Error
Jun 10, 2026 09:13	Victor Mercklé	GOgo1.26.2	Success	3,958
Jun 10, 2026 09:08	Victor Mercklé	GOgo1.26.2	Success	4,690
Jun 10, 2026 09:03	Victor Mercklé	GOgo1.26.2	Error
Jun 10, 2026 08:58	Victor Mercklé	GOgo1.26.2	Error
Jun 10, 2026 08:53	Victor Mercklé	GOgo1.26.2	Error
Jun 10, 2026 05:42	Victor Mercklé	ZIG0.16.0	Error
Jun 10, 2026 05:31	Victor Mercklé	ZIG0.16.0	Error
Jun 10, 2026 05:18	Victor Mercklé	ZIG0.16.0	Error
Jun 10, 2026 05:02	Victor Mercklé	ZIG0.16.0	Success	3,355
Jun 10, 2026 04:50	Victor Mercklé	ZIG0.16.0	Success	3,923
Jun 10, 2026 02:57	Elijah Kin	CPPg++14.2.0	Success	2,518
Jun 10, 2026 02:04	Elijah Kin	CPPg++14.2.0	Success	2,677
Jun 10, 2026 02:01	Elijah Kin	CPPg++14.2.0	Success	2,238
Jun 10, 2026 01:06	Elijah Kin	CPPclang++20.1.2	Success	2,726
Jun 10, 2026 00:53	Elijah Kin	CPPg++14.2.0	Success	2,268
Jun 9, 2026 23:58	Victor Mercklé	CSHARP10.0.7	Error
Jun 9, 2026 23:47	Victor Mercklé	CSHARP10.0.7	Error
Jun 9, 2026 23:37	Victor Mercklé	CSHARP10.0.7	Success	4,335
Jun 9, 2026 23:23	Victor Mercklé	CSHARP10.0.7	Error
Jun 9, 2026 22:56	Victor Mercklé	CSHARP10.0.7	Error
Jun 9, 2026 21:04	Elijah Kin	CPPg++14.2.0	Success	2,315
Jun 9, 2026 19:53	Elijah Kin	CPPg++14.2.0	Success	2,205
Jun 9, 2026 05:16	Elijah Kin	CPPg++14.2.0	Success	2,220
Jun 9, 2026 05:10	Elijah Kin	CPPg++14.2.0	Success	2,237
Jun 9, 2026 05:05	Elijah Kin	CPPg++14.2.0	Success	2,290
Jun 9, 2026 05:00	Elijah Kin	CPPg++14.2.0	Success	2,298
Jun 9, 2026 04:54	Elijah Kin	CPPg++14.2.0	Success	2,202
Jun 9, 2026 04:38	Elijah Kin	CPPg++14.2.0	Success	2,057
Jun 9, 2026 04:32	Elijah Kin	CPPg++14.2.0	Success	2,234
Jun 9, 2026 04:28	Elijah Kin	CPPg++14.2.0	Success	2,888
Jun 9, 2026 04:20	Elijah Kin	CPPg++14.2.0	Success	3,056
Jun 9, 2026 04:12	Elijah Kin	CPPg++14.2.0	Success	2,985
Jun 9, 2026 03:53	Elijah Kin	CPPg++14.2.0	Success	2,192
Jun 9, 2026 03:25	Elijah Kin	CPPg++14.2.0	Success	2,335
Jun 9, 2026 03:13	Elijah Kin	CPPg++14.2.0	Success	2,406
Jun 9, 2026 03:10	Elijah Kin	CPPg++14.2.0	Success	2,055
Jun 9, 2026 03:06	Elijah Kin	CPPg++14.2.0	Success	2,293
Jun 9, 2026 03:03	Elijah Kin	CPPg++14.2.0	Success	2,228
Jun 9, 2026 03:00	Elijah Kin	CPPg++14.2.0	Success	2,297
Jun 9, 2026 02:39	Elijah Kin	CPPg++14.2.0	Success	2,266
Jun 9, 2026 02:22	Elijah Kin	CPPg++14.2.0	Success	2,270
Jun 9, 2026 02:19	Elijah Kin	CPPg++14.2.0	Success	2,166
Jun 9, 2026 02:11	Elijah Kin	CPPg++14.2.0	Success	2,297
Jun 9, 2026 02:00	Elijah Kin	CPPg++14.2.0	Success	2,231
Jun 9, 2026 01:54	Elijah Kin	CPPg++14.2.0	Success	2,145
Jun 9, 2026 01:48	Elijah Kin	CPPg++14.2.0	Success	2,238
Jun 9, 2026 01:44	Elijah Kin	CPPg++14.2.0	Success	2,283
Jun 9, 2026 01:29	Elijah Kin	CPPg++14.2.0	Success	2,327
Jun 9, 2026 00:33	Elijah Kin	CPPg++14.2.0	Success	2,040+71.04 RP
Jun 9, 2026 00:23	Elijah Kin	CPPg++14.2.0	Success	2,178
Jun 9, 2026 00:21	Elijah Kin	CPPg++14.2.0	Success	2,701
Jun 8, 2026 23:55	Elijah Kin	CPPg++14.2.0	Success	2,264
Jun 8, 2026 23:51	Elijah Kin	CPPg++14.2.0	Success	2,813
Jun 8, 2026 23:48	Elijah Kin	CPPg++14.2.0	Success	3,392
Jun 8, 2026 23:26	Elijah Kin	CPPg++14.2.0	Error
Jun 8, 2026 23:13	Elijah Kin	CPPg++14.2.0	Success	2,268
Jun 8, 2026 23:06	Elijah Kin	CPPg++14.2.0	Success	2,363
Jun 8, 2026 22:58	Elijah Kin	CPPg++14.2.0	Success	2,311
Jun 8, 2026 22:50	Elijah Kin	CPPg++14.2.0	Success	2,170
Jun 8, 2026 22:00	Elijah Kin	CPPg++14.2.0	Success	2,070+20.91 RP
Jun 8, 2026 21:55	Elijah Kin	CPPg++14.2.0	Success	2,266
Jun 8, 2026 21:48	Elijah Kin	CPPg++14.2.0	Success	2,443
Jun 8, 2026 21:32	Elijah Kin	CPPg++14.2.0	Success	2,448
Jun 8, 2026 21:24	Elijah Kin	CPPg++14.2.0	Success	2,370
Jun 8, 2026 21:20	Elijah Kin	CPPg++14.2.0	Success	2,401
Jun 8, 2026 21:08	Elijah Kin	CPPg++14.2.0	Success	2,174
Jun 8, 2026 20:48	Elijah Kin	CPPg++14.2.0	Success	2,341
Jun 8, 2026 19:09	Victor Mercklé	RUSTrust-1.95.0	Success	3,586
Jun 8, 2026 17:44	Elijah Kin	CPPg++14.2.0	Success	2,489
Jun 8, 2026 15:59	Elijah Kin	CPPg++14.2.0	Success	2,502
Jun 8, 2026 15:36	Elijah Kin	CPPg++14.2.0	Success	2,281
Jun 8, 2026 15:33	Elijah Kin	CPPg++14.2.0	Success	2,479
Jun 8, 2026 15:23	Elijah Kin	CPPg++14.2.0	Success	2,370
Jun 8, 2026 15:11	Elijah Kin	CPPg++14.2.0	Success	2,284
Jun 8, 2026 12:18	Victor Mercklé	CPPg++14.2.0	Success	1,803
Jun 8, 2026 12:06	Victor Mercklé	CPPg++14.2.0	Success	1,756
Jun 8, 2026 11:53	Victor Mercklé	CPPg++14.2.0	Success	1,787
Jun 8, 2026 11:41	Victor Mercklé	CPPg++14.2.0	Success	1,829
Jun 8, 2026 11:35	Victor Mercklé	CPPg++14.2.0	Success	1,756+5.00 RP
Jun 8, 2026 05:03	Elijah Kin	CPPg++14.2.0	Success	2,261
Jun 8, 2026 03:23	Elijah Kin	CPPg++14.2.0	Success	2,222
Jun 8, 2026 03:16	Elijah Kin	CPPg++14.2.0	Success	2,396
Jun 8, 2026 03:12	Elijah Kin	CPPg++14.2.0	Success	2,364
Jun 8, 2026 02:54	Elijah Kin	CPPg++14.2.0	Success	2,079+84.11 RP
Jun 8, 2026 02:47	Elijah Kin	CPPg++14.2.0	Success	2,116+261.61 RP
Jun 8, 2026 02:32	Elijah Kin	CPPg++14.2.0	Success	2,240+43.42 RP
Jun 8, 2026 02:17	Elijah Kin	CPPg++14.2.0	Success	2,290
Jun 8, 2026 02:11	Elijah Kin	CPPg++14.2.0	Success	2,342+5.00 RP
Jun 7, 2026 16:41	Elijah Kin	CPPg++14.2.0	Success	2,496
Jun 7, 2026 16:19	Elijah Kin	CPPg++14.2.0	Success	2,474
Jun 7, 2026 16:14	Elijah Kin	CPPg++14.2.0	Success	2,460

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