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
May 30, 2026 07:38	Victor Mercklé	CPPg++14.2.0	Success	2,627
May 30, 2026 07:33	Victor Mercklé	CPPg++14.2.0	Success	2,605
May 30, 2026 07:25	Victor Mercklé	CPPg++14.2.0	Success	2,638
May 30, 2026 07:20	Victor Mercklé	CPPg++14.2.0	Success	2,598
May 30, 2026 07:08	Victor Mercklé	CPPg++14.2.0	Success	2,623
May 30, 2026 07:04	Victor Mercklé	CPPg++14.2.0	Success	2,626
May 30, 2026 07:01	Victor Mercklé	CPPg++14.2.0	Success	2,634
May 30, 2026 06:52	Victor Mercklé	CPPg++14.2.0	Success	2,558
May 30, 2026 06:48	Victor Mercklé	CPPg++14.2.0	Success	2,625
May 30, 2026 06:39	Victor Mercklé	CPPg++14.2.0	Success	2,632
May 30, 2026 06:36	Victor Mercklé	CPPg++14.2.0	Success	2,612
May 30, 2026 06:31	Victor Mercklé	CPPg++14.2.0	Success	2,626
May 30, 2026 06:23	Victor Mercklé	CPPg++14.2.0	Success	2,620
May 30, 2026 06:20	Victor Mercklé	CPPg++14.2.0	Success	2,614
May 30, 2026 06:09	Victor Mercklé	CPPg++14.2.0	Success	2,622
May 30, 2026 06:06	Victor Mercklé	CPPg++14.2.0	Success	2,572
May 30, 2026 06:02	Victor Mercklé	CPPg++14.2.0	Success	2,606
May 30, 2026 05:55	Victor Mercklé	CPPg++14.2.0	Success	2,626
May 30, 2026 05:50	Victor Mercklé	CPPg++14.2.0	Success	2,567
May 30, 2026 05:43	Victor Mercklé	CPPg++14.2.0	Success	2,611
May 30, 2026 05:38	Victor Mercklé	CPPg++14.2.0	Success	2,559
May 30, 2026 05:28	Victor Mercklé	CPPg++14.2.0	Success	2,623
May 30, 2026 05:20	Victor Mercklé	CPPg++14.2.0	Success	2,594
May 30, 2026 05:15	Victor Mercklé	CPPg++14.2.0	Success	2,745
May 30, 2026 05:07	Victor Mercklé	CPPg++14.2.0	Success	2,625
May 30, 2026 04:59	Victor Mercklé	CPPg++14.2.0	Success	2,621
May 30, 2026 04:56	Victor Mercklé	CPPg++14.2.0	Success	2,607
May 30, 2026 04:49	Victor Mercklé	CPPg++14.2.0	Success	2,587
May 30, 2026 04:43	Victor Mercklé	CPPg++14.2.0	Success	2,553
May 30, 2026 04:35	Victor Mercklé	CPPg++14.2.0	Success	2,605
May 30, 2026 04:25	Victor Mercklé	CPPg++14.2.0	Success	2,601
May 30, 2026 04:22	Victor Mercklé	CPPg++14.2.0	Success	2,624
May 30, 2026 04:19	Victor Mercklé	CPPg++14.2.0	Success	2,614
May 30, 2026 04:11	Victor Mercklé	CPPg++14.2.0	Success	2,560
May 30, 2026 04:06	Victor Mercklé	CPPg++14.2.0	Success	2,631
May 30, 2026 04:01	Victor Mercklé	CPPg++14.2.0	Success	2,556
May 30, 2026 03:55	Victor Mercklé	CPPg++14.2.0	Success	2,644
May 30, 2026 03:52	Victor Mercklé	CPPg++14.2.0	Success	2,720
May 30, 2026 03:47	Victor Mercklé	CPPg++14.2.0	Success	2,578
May 30, 2026 03:41	Victor Mercklé	CPPg++14.2.0	Success	2,539
May 30, 2026 03:34	Victor Mercklé	CPPg++14.2.0	Success	2,540
May 30, 2026 03:31	Victor Mercklé	CPPg++14.2.0	Success	2,605
May 30, 2026 03:27	Victor Mercklé	CPPg++14.2.0	Success	2,624
May 30, 2026 03:23	Victor Mercklé	CPPg++14.2.0	Success	2,602
May 30, 2026 03:20	Victor Mercklé	CPPg++14.2.0	Success	2,539
May 30, 2026 03:17	Victor Mercklé	CPPg++14.2.0	Success	2,531+1.56 RP
May 30, 2026 03:12	Victor Mercklé	CPPg++14.2.0	Success	2,541
May 30, 2026 03:08	Victor Mercklé	CPPg++14.2.0	Success	2,725
May 30, 2026 03:05	Victor Mercklé	CPPg++14.2.0	Success	2,534
May 30, 2026 03:02	Victor Mercklé	CPPg++14.2.0	Success	2,532
May 30, 2026 02:58	Victor Mercklé	CPPg++14.2.0	Success	2,541
May 30, 2026 02:55	Victor Mercklé	CPPg++14.2.0	Success	2,759
May 30, 2026 02:53	Elijah Kin	CPPg++14.2.0	Success	9,417
May 30, 2026 02:46	Victor Mercklé	CPPg++14.2.0	Success	2,532+4.67 RP
May 30, 2026 02:43	Victor Mercklé	CPPg++14.2.0	Success	2,536
May 30, 2026 02:40	Victor Mercklé	CPPg++14.2.0	Success	2,546
May 30, 2026 02:35	Elijah Kin	CPPg++14.2.0	Error
May 30, 2026 02:29	Victor Mercklé	CPPg++14.2.0	Success	2,579
May 30, 2026 02:26	Victor Mercklé	CPPg++14.2.0	Success	2,592
May 30, 2026 02:15	Victor Mercklé	CPPg++14.2.0	Success	2,570
May 30, 2026 02:15	Elijah Kin	CPPg++14.2.0	Success	10,574
May 30, 2026 02:12	Victor Mercklé	CPPg++14.2.0	Success	2,561
May 30, 2026 02:08	Victor Mercklé	CPPg++14.2.0	Success	2,549
May 30, 2026 02:01	Victor Mercklé	CPPg++14.2.0	Success	2,657
May 30, 2026 01:54	Victor Mercklé	CPPg++14.2.0	Success	2,545
May 30, 2026 01:42	Victor Mercklé	CPPg++14.2.0	Success	2,562
May 30, 2026 01:38	Victor Mercklé	CPPg++14.2.0	Success	2,544
May 30, 2026 01:35	Victor Mercklé	CPPg++14.2.0	Success	2,560
May 30, 2026 01:32	Victor Mercklé	CPPg++14.2.0	Success	2,544
May 30, 2026 01:29	Victor Mercklé	CPPg++14.2.0	Success	2,556
May 30, 2026 01:21	Victor Mercklé	CPPg++14.2.0	Success	2,624
May 30, 2026 01:18	Victor Mercklé	CPPg++14.2.0	Success	2,542
May 30, 2026 01:14	Victor Mercklé	CPPg++14.2.0	Success	2,592
May 30, 2026 01:10	Victor Mercklé	CPPg++14.2.0	Success	2,616
May 30, 2026 01:01	Victor Mercklé	CPPg++14.2.0	Success	2,614
May 30, 2026 00:57	Victor Mercklé	CPPg++14.2.0	Success	2,708
May 30, 2026 00:47	Victor Mercklé	CPPg++14.2.0	Success	2,564
May 30, 2026 00:42	Victor Mercklé	CPPg++14.2.0	Success	2,590
May 30, 2026 00:39	Victor Mercklé	CPPg++14.2.0	Success	2,560
May 30, 2026 00:36	Victor Mercklé	CPPg++14.2.0	Success	2,539
May 30, 2026 00:28	Victor Mercklé	CPPg++14.2.0	Success	2,588
May 30, 2026 00:25	Victor Mercklé	CPPg++14.2.0	Success	2,598
May 30, 2026 00:20	Victor Mercklé	CPPg++14.2.0	Success	2,629
May 30, 2026 00:16	Victor Mercklé	CPPg++14.2.0	Success	2,559
May 30, 2026 00:11	Victor Mercklé	CPPg++14.2.0	Success	2,582
May 30, 2026 00:05	Victor Mercklé	CPPg++14.2.0	Success	2,535
May 29, 2026 23:58	Victor Mercklé	CPPg++14.2.0	Success	2,777
May 29, 2026 23:55	Victor Mercklé	CPPg++14.2.0	Success	2,739
May 29, 2026 23:52	Victor Mercklé	CPPg++14.2.0	Success	2,560
May 29, 2026 23:49	Victor Mercklé	CPPg++14.2.0	Success	2,537
May 29, 2026 23:43	Victor Mercklé	CPPg++14.2.0	Success	2,548
May 29, 2026 23:40	Victor Mercklé	CPPg++14.2.0	Success	2,572
May 29, 2026 23:36	Victor Mercklé	CPPg++14.2.0	Success	2,552
May 29, 2026 23:33	Victor Mercklé	CPPg++14.2.0	Success	2,548
May 29, 2026 23:25	Victor Mercklé	CPPg++14.2.0	Success	2,580
May 29, 2026 23:21	Victor Mercklé	CPPg++14.2.0	Success	2,591
May 29, 2026 23:10	Victor Mercklé	CPPg++14.2.0	Success	2,621
May 29, 2026 23:07	Victor Mercklé	CPPg++14.2.0	Success	2,535+4.66 RP
May 29, 2026 23:04	Victor Mercklé	CPPg++14.2.0	Success	2,543
May 29, 2026 23:01	Victor Mercklé	CPPg++14.2.0	Success	2,625

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