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 1, 2026 16:50	Victor Mercklé	CPPg++14.2.0	Success	2,544
Jun 1, 2026 16:45	Victor Mercklé	CPPg++14.2.0	Success	2,509+4.76 RP
Jun 1, 2026 16:35	Victor Mercklé	CPPg++14.2.0	Success	2,604
Jun 1, 2026 16:30	Victor Mercklé	CPPg++14.2.0	Success	2,579
Jun 1, 2026 16:19	Victor Mercklé	CPPg++14.2.0	Success	2,773
Jun 1, 2026 15:55	Victor Mercklé	CPPg++14.2.0	Success	2,610
Jun 1, 2026 15:50	Victor Mercklé	CPPg++14.2.0	Success	2,566
Jun 1, 2026 15:45	Victor Mercklé	CPPg++14.2.0	Success	2,552
Jun 1, 2026 15:38	Victor Mercklé	CPPg++14.2.0	Success	2,533
Jun 1, 2026 15:33	Victor Mercklé	CPPg++14.2.0	Success	2,589
Jun 1, 2026 15:28	Victor Mercklé	CPPg++14.2.0	Success	2,582
Jun 1, 2026 15:23	Victor Mercklé	CPPg++14.2.0	Success	2,589
Jun 1, 2026 15:18	Victor Mercklé	CPPg++14.2.0	Success	2,512+6.33 RP
Jun 1, 2026 15:13	Victor Mercklé	CPPg++14.2.0	Success	2,529
Jun 1, 2026 15:07	Victor Mercklé	CPPg++14.2.0	Success	2,628
Jun 1, 2026 15:02	Victor Mercklé	CPPg++14.2.0	Success	2,541
Jun 1, 2026 14:57	Victor Mercklé	CPPg++14.2.0	Success	2,568
Jun 1, 2026 14:52	Victor Mercklé	CPPg++14.2.0	Success	2,535
Jun 1, 2026 14:47	Victor Mercklé	CPPg++14.2.0	Success	2,522
Jun 1, 2026 13:20	Victor Mercklé	CPPg++14.2.0	Success	2,596
Jun 1, 2026 13:03	Victor Mercklé	CPPg++14.2.0	Success	2,563
Jun 1, 2026 12:58	Victor Mercklé	CPPg++14.2.0	Success	2,618
Jun 1, 2026 12:53	Victor Mercklé	CPPg++14.2.0	Success	2,579
Jun 1, 2026 12:48	Victor Mercklé	CPPg++14.2.0	Success	2,611
Jun 1, 2026 12:43	Victor Mercklé	CPPg++14.2.0	Success	2,574
Jun 1, 2026 12:38	Victor Mercklé	CPPg++14.2.0	Success	2,526
Jun 1, 2026 12:32	Victor Mercklé	CPPg++14.2.0	Success	2,542
Jun 1, 2026 12:13	Victor Mercklé	CPPg++14.2.0	Success	2,621
Jun 1, 2026 12:08	Victor Mercklé	CPPg++14.2.0	Success	2,610
Jun 1, 2026 11:48	Victor Mercklé	CPPg++14.2.0	Success	2,605
Jun 1, 2026 11:43	Victor Mercklé	CPPg++14.2.0	Success	2,604
Jun 1, 2026 11:38	Victor Mercklé	CPPg++14.2.0	Success	2,564
Jun 1, 2026 11:30	Victor Mercklé	CPPg++14.2.0	Success	2,607
Jun 1, 2026 11:25	Victor Mercklé	CPPg++14.2.0	Success	2,616
Jun 1, 2026 11:20	Victor Mercklé	CPPg++14.2.0	Success	2,575
Jun 1, 2026 11:15	Victor Mercklé	CPPg++14.2.0	Success	2,526
Jun 1, 2026 11:10	Victor Mercklé	CPPg++14.2.0	Success	2,611
Jun 1, 2026 11:00	Victor Mercklé	CPPg++14.2.0	Success	2,616
Jun 1, 2026 10:55	Victor Mercklé	CPPg++14.2.0	Success	2,596
Jun 1, 2026 10:50	Victor Mercklé	CPPg++14.2.0	Success	2,606
Jun 1, 2026 10:41	Victor Mercklé	CPPg++14.2.0	Success	2,590
Jun 1, 2026 10:36	Victor Mercklé	CPPg++14.2.0	Success	2,604
Jun 1, 2026 10:31	Victor Mercklé	CPPg++14.2.0	Success	2,602
Jun 1, 2026 10:26	Victor Mercklé	CPPg++14.2.0	Success	2,606
Jun 1, 2026 10:21	Victor Mercklé	CPPg++14.2.0	Success	2,565
Jun 1, 2026 10:16	Victor Mercklé	CPPg++14.2.0	Success	2,528
Jun 1, 2026 10:11	Victor Mercklé	CPPg++14.2.0	Success	2,560
Jun 1, 2026 10:06	Victor Mercklé	CPPg++14.2.0	Success	2,516+11.03 RP
Jun 1, 2026 10:03	Victor Mercklé	CPPg++14.2.0	Success	2,614
Jun 1, 2026 10:00	Victor Mercklé	CPPg++14.2.0	Success	2,526
Jun 1, 2026 09:57	Victor Mercklé	CPPg++14.2.0	Success	2,523+9.40 RP
Jun 1, 2026 09:54	Victor Mercklé	CPPg++14.2.0	Success	2,595
Jun 1, 2026 09:52	Victor Mercklé	CPPg++14.2.0	Success	2,607
Jun 1, 2026 09:48	Victor Mercklé	CPPg++14.2.0	Success	2,529+3.12 RP
Jun 1, 2026 09:45	Victor Mercklé	CPPg++14.2.0	Success	2,658
Jun 1, 2026 09:43	Victor Mercklé	CPPg++14.2.0	Success	2,583
May 30, 2026 13:19	Victor Mercklé	CPPg++14.2.0	Success	2,636
May 30, 2026 13:13	Victor Mercklé	CPPg++14.2.0	Success	2,560
May 30, 2026 13:08	Victor Mercklé	CPPg++14.2.0	Success	2,619
May 30, 2026 13:01	Victor Mercklé	CPPg++14.2.0	Success	2,566
May 30, 2026 12:51	Victor Mercklé	CPPg++14.2.0	Success	2,606
May 30, 2026 12:42	Victor Mercklé	CPPg++14.2.0	Success	2,603
May 30, 2026 12:30	Victor Mercklé	CPPg++14.2.0	Success	2,596
May 30, 2026 12:21	Victor Mercklé	CPPg++14.2.0	Success	2,612
May 30, 2026 12:15	Victor Mercklé	CPPg++14.2.0	Success	2,621
May 30, 2026 12:12	Victor Mercklé	CPPg++14.2.0	Success	2,608
May 30, 2026 12:02	Victor Mercklé	CPPg++14.2.0	Success	2,666
May 30, 2026 11:53	Victor Mercklé	CPPg++14.2.0	Success	2,539
May 30, 2026 11:50	Victor Mercklé	CPPg++14.2.0	Success	2,542
May 30, 2026 11:47	Victor Mercklé	CPPg++14.2.0	Success	2,537
May 30, 2026 11:44	Victor Mercklé	CPPg++14.2.0	Success	2,604
May 30, 2026 11:32	Victor Mercklé	CPPg++14.2.0	Success	2,612
May 30, 2026 11:21	Victor Mercklé	CPPg++14.2.0	Success	2,594
May 30, 2026 11:13	Victor Mercklé	CPPg++14.2.0	Success	2,548
May 30, 2026 11:04	Victor Mercklé	CPPg++14.2.0	Success	2,596
May 30, 2026 11:00	Victor Mercklé	CPPg++14.2.0	Success	2,579
May 30, 2026 10:48	Victor Mercklé	CPPg++14.2.0	Success	2,796
May 30, 2026 10:41	Victor Mercklé	CPPg++14.2.0	Success	2,566
May 30, 2026 10:37	Victor Mercklé	CPPg++14.2.0	Success	2,567
May 30, 2026 10:30	Victor Mercklé	CPPg++14.2.0	Success	2,634
May 30, 2026 10:14	Victor Mercklé	CPPg++14.2.0	Success	2,621
May 30, 2026 10:00	Victor Mercklé	CPPg++14.2.0	Success	2,616
May 30, 2026 09:42	Victor Mercklé	CPPg++14.2.0	Success	2,566
May 30, 2026 09:36	Victor Mercklé	CPPg++14.2.0	Success	2,595
May 30, 2026 09:27	Victor Mercklé	CPPg++14.2.0	Success	2,616
May 30, 2026 09:22	Victor Mercklé	CPPg++14.2.0	Success	2,808
May 30, 2026 09:10	Victor Mercklé	CPPg++14.2.0	Success	2,643
May 30, 2026 09:06	Victor Mercklé	CPPg++14.2.0	Success	2,673
May 30, 2026 08:54	Victor Mercklé	CPPg++14.2.0	Success	2,672
May 30, 2026 08:48	Victor Mercklé	CPPg++14.2.0	Success	2,648
May 30, 2026 08:43	Victor Mercklé	CPPg++14.2.0	Success	2,598
May 30, 2026 08:37	Victor Mercklé	CPPg++14.2.0	Success	2,623
May 30, 2026 08:28	Victor Mercklé	CPPg++14.2.0	Success	2,657
May 30, 2026 08:24	Victor Mercklé	CPPg++14.2.0	Success	2,634
May 30, 2026 08:14	Victor Mercklé	CPPg++14.2.0	Success	2,582
May 30, 2026 08:06	Victor Mercklé	CPPg++14.2.0	Success	2,806
May 30, 2026 08:00	Victor Mercklé	CPPg++14.2.0	Success	2,570
May 30, 2026 07:53	Victor Mercklé	CPPg++14.2.0	Success	2,616
May 30, 2026 07:49	Victor Mercklé	CPPg++14.2.0	Success	2,554
May 30, 2026 07:41	Victor Mercklé	CPPg++14.2.0	Success	2,630

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