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
Aug 30, 2026 23:13	Victor Mercklé	CPPg++14.2.0	Success	1,480
Aug 30, 2026 22:58	Victor Mercklé	CPPg++14.2.0	Success	1,584
Aug 30, 2026 22:34	Victor Mercklé	CPPg++14.2.0	Success	1,474
Aug 30, 2026 21:39	Victor Mercklé	CPPg++14.2.0	Success	1,580
Aug 30, 2026 21:29	Victor Mercklé	CPPg++14.2.0	Success	1,501
Aug 30, 2026 21:24	Victor Mercklé	CPPg++14.2.0	Success	1,550
Aug 30, 2026 20:55	Victor Mercklé	GOgo1.26.2	Success	1,999
Aug 30, 2026 20:44	Victor Mercklé	GOgo1.26.2	Success	2,059
Aug 30, 2026 20:40	Victor Mercklé	CSHARP10.0.7	Error
Aug 30, 2026 20:31	Victor Mercklé	CSHARP10.0.7	Error
Aug 30, 2026 20:21	Victor Mercklé	CSHARP10.0.7	Error
Aug 30, 2026 20:18	Victor Mercklé	GOgo1.26.2	Error
Aug 30, 2026 20:16	Victor Mercklé	RUSTrust-1.95.0	Error
Aug 30, 2026 20:12	Victor Mercklé	ZIG0.16.0	Error
Aug 30, 2026 16:37	Tomislav Tunkovic	RUSTrust-1.95.0	Success	1,662
Aug 30, 2026 16:32	Tomislav Tunkovic	CSHARP9.0.15	Success	2,250+935.67 RP
Aug 30, 2026 16:30	Tomislav Tunkovic	GOgo1.26.2	Success	2,047+416.92 RP
Aug 30, 2026 16:23	Tomislav Tunkovic	ZIG0.15.1	Success	1,653+174.17 RP
Aug 30, 2026 16:17	Tomislav Tunkovic	RUSTrust-1.95.0	Success	1,748
Aug 29, 2026 17:51	Victor Mercklé	CPPg++14.2.0	Success	1,469+64.56 RP
Aug 29, 2026 17:26	Victor Mercklé	CPPg++14.2.0	Success	1,494
Aug 29, 2026 17:14	Victor Mercklé	CPPg++14.2.0	Success	1,548
Aug 29, 2026 16:56	Victor Mercklé	CPPg++14.2.0	Success	1,508
Aug 29, 2026 16:36	Victor Mercklé	CPPg++14.2.0	Success	1,476+400.80 RP
Aug 29, 2026 15:54	Victor Mercklé	CPPg++14.2.0	Success	1,525+97.43 RP
Aug 29, 2026 15:50	Victor Mercklé	CPPg++14.2.0	Success	1,548+74.25 RP
Aug 29, 2026 15:16	Victor Mercklé	CPPg++14.2.0	Success	1,586
Aug 29, 2026 14:53	Victor Mercklé	CPPg++14.2.0	Success	1,597
Aug 29, 2026 14:35	Victor Mercklé	CPPclang++20.1.2	Success	1,637
Aug 29, 2026 14:19	Victor Mercklé	CPPg++14.2.0	Success	1,577
Aug 29, 2026 14:11	Victor Mercklé	CPPg++14.2.0	Success	1,584
Aug 29, 2026 14:09	Victor Mercklé	CPPg++14.2.0	Success	1,582
Aug 29, 2026 13:56	Victor Mercklé	CPPg++14.2.0	Success	1,566+40.52 RP
Aug 29, 2026 13:46	Victor Mercklé	CPPg++14.2.0	Success	1,576+47.95 RP
Aug 29, 2026 13:31	Victor Mercklé	CPPg++14.2.0	Success	1,634
Aug 29, 2026 13:25	Victor Mercklé	CPPg++14.2.0	Success	1,589
Aug 29, 2026 13:17	Victor Mercklé	CPPg++14.2.0	Success	1,658
Aug 29, 2026 13:09	Victor Mercklé	CPPg++14.2.0	Success	1,632
Aug 29, 2026 13:02	Victor Mercklé	CPPg++14.2.0	Success	1,683
Aug 29, 2026 12:55	Victor Mercklé	CPPg++14.2.0	Success	1,646
Aug 29, 2026 12:39	Victor Mercklé	CPPg++14.2.0	Success	1,673
Aug 29, 2026 12:29	Victor Mercklé	CPPg++14.2.0	Success	1,626
Aug 29, 2026 12:19	Victor Mercklé	CPPg++14.2.0	Success	1,642
Aug 29, 2026 12:06	Victor Mercklé	CPPg++14.2.0	Success	1,650
Aug 29, 2026 11:53	Victor Mercklé	CPPg++14.2.0	Success	1,629
Aug 29, 2026 11:49	Victor Mercklé	CPPg++14.2.0	Success	1,648
Aug 29, 2026 11:39	Victor Mercklé	CPPg++14.2.0	Success	1,788
Aug 29, 2026 11:28	Victor Mercklé	CPPg++14.2.0	Success	1,844
Aug 29, 2026 11:25	Victor Mercklé	CPPg++14.2.0	Success	1,638
Aug 29, 2026 11:19	Victor Mercklé	CPPg++14.2.0	Success	1,802
Aug 29, 2026 11:12	Victor Mercklé	CPPg++14.2.0	Success	1,615
Aug 29, 2026 11:03	Victor Mercklé	CPPg++13.3.0	Success	1,675
Aug 29, 2026 10:42	Victor Mercklé	CPPclang++20.1.2	Success	1,754
Aug 29, 2026 10:25	Victor Mercklé	CPPg++14.2.0	Success	1,664
Aug 29, 2026 10:19	Victor Mercklé	CPPg++14.2.0	Success	1,738
Aug 29, 2026 10:08	Victor Mercklé	CPPg++14.2.0	Success	1,654
Aug 29, 2026 10:01	Victor Mercklé	CPPg++14.2.0	Success	1,625
Aug 29, 2026 09:52	Victor Mercklé	CPPg++14.2.0	Success	1,914
Aug 29, 2026 09:45	Victor Mercklé	CPPg++14.2.0	Success	1,799
Aug 29, 2026 09:42	Victor Mercklé	CPPg++14.2.0	Success	1,601
Aug 29, 2026 09:31	Victor Mercklé	CPPg++14.2.0	Success	1,600
Aug 29, 2026 09:25	Victor Mercklé	CPPg++14.2.0	Success	1,596
Aug 29, 2026 09:17	Victor Mercklé	CPPg++14.2.0	Success	1,598
Aug 29, 2026 09:13	Victor Mercklé	CPPg++14.2.0	Success	1,616
Aug 29, 2026 09:08	Victor Mercklé	CPPg++14.2.0	Success	1,629
Aug 29, 2026 09:03	Victor Mercklé	CPPg++14.2.0	Success	1,670
Aug 29, 2026 08:57	Victor Mercklé	CPPg++14.2.0	Success	1,690
Aug 29, 2026 08:45	Victor Mercklé	CPPg++14.2.0	Success	1,594
Aug 29, 2026 08:34	Victor Mercklé	CPPg++14.2.0	Success	1,600
Aug 27, 2026 22:48	Elijah Kin	CPPg++14.2.0	Success	2,295
Aug 27, 2026 22:36	Elijah Kin	CPPg++14.2.0	Success	2,694
Aug 27, 2026 22:34	Elijah Kin	CPPg++14.2.0	Success	2,701
Aug 27, 2026 22:28	Elijah Kin	CPPg++14.2.0	Success	2,226
Aug 27, 2026 22:26	Elijah Kin	CPPg++14.2.0	Success	2,309
Aug 27, 2026 22:21	Elijah Kin	CPPg++14.2.0	Success	2,300
Aug 27, 2026 22:20	Elijah Kin	CPPg++14.2.0	Success	3,044
Aug 27, 2026 22:08	Elijah Kin	CPPg++14.2.0	Success	2,291
Aug 27, 2026 22:00	Elijah Kin	CPPg++14.2.0	Success	2,633
Aug 27, 2026 21:43	Elijah Kin	CPPg++14.2.0	Success	2,316
Aug 27, 2026 21:33	Elijah Kin	CPPg++14.2.0	Success	2,231
Aug 27, 2026 21:28	Elijah Kin	CPPg++14.2.0	Success	2,298
Aug 27, 2026 21:26	Elijah Kin	CPPg++14.2.0	Success	2,276
Aug 27, 2026 21:19	Elijah Kin	CPPg++14.2.0	Success	2,509
Aug 27, 2026 21:14	Elijah Kin	CPPg++14.2.0	Success	2,219
Aug 27, 2026 21:11	Elijah Kin	CPPg++14.2.0	Success	2,268
Aug 27, 2026 21:05	Elijah Kin	CPPg++14.2.0	Success	3,132
Aug 27, 2026 20:59	Elijah Kin	CPPg++14.2.0	Success	2,326
Aug 27, 2026 20:55	Elijah Kin	CPPg++14.2.0	Success	3,075
Aug 27, 2026 20:52	Elijah Kin	CPPg++14.2.0	Success	2,292
Aug 27, 2026 20:51	Elijah Kin	CPPg++14.2.0	Success	2,236
Aug 27, 2026 18:24	Elijah Kin	CPPg++14.2.0	Success	2,578
Aug 27, 2026 18:22	Elijah Kin	CPPg++14.2.0	Success	2,281
Aug 27, 2026 18:02	Elijah Kin	CPPg++14.2.0	Success	2,429
Aug 27, 2026 17:59	Elijah Kin	CPPg++14.2.0	Success	2,374
Aug 27, 2026 17:56	Elijah Kin	CPPg++14.2.0	Success	2,391
Aug 27, 2026 17:51	Elijah Kin	CPPg++14.2.0	Success	2,504
Aug 27, 2026 17:43	Elijah Kin	CPPg++14.2.0	Success	2,292
Aug 27, 2026 17:41	Elijah Kin	CPPg++14.2.0	Success	2,680
Aug 27, 2026 17:36	Elijah Kin	CPPg++14.2.0	Error
Aug 27, 2026 17:34	Elijah Kin	CPPg++14.2.0	Success	2,310

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