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 29, 2026 17:54	Victor Mercklé	CPPg++14.2.0	Success	2,623
May 29, 2026 17:48	Victor Mercklé	CPPg++14.2.0	Success	2,654
May 29, 2026 17:46	Victor Mercklé	CPPg++14.2.0	Success	2,713
May 29, 2026 17:41	Victor Mercklé	CPPg++14.2.0	Success	2,686
May 29, 2026 17:36	Victor Mercklé	CPPg++14.2.0	Success	2,687
May 29, 2026 17:31	Victor Mercklé	CPPg++14.2.0	Success	2,701
May 29, 2026 17:26	Victor Mercklé	CPPg++14.2.0	Success	2,602
May 29, 2026 17:22	Victor Mercklé	CPPg++14.2.0	Success	2,644
May 29, 2026 16:39	Victor Mercklé	CPPg++14.2.0	Success	2,694
May 29, 2026 16:36	Victor Mercklé	CPPg++14.2.0	Success	2,593
May 29, 2026 16:33	Victor Mercklé	CPPg++14.2.0	Success	2,696
May 29, 2026 16:25	Victor Mercklé	CPPg++14.2.0	Success	2,658
May 29, 2026 16:18	Victor Mercklé	CPPg++14.2.0	Success	2,583+17.90 RP
May 29, 2026 16:14	Victor Mercklé	CPPg++14.2.0	Success	2,713
May 29, 2026 16:08	Victor Mercklé	CPPg++14.2.0	Success	2,687
May 29, 2026 15:54	Victor Mercklé	CPPg++14.2.0	Success	2,682
May 29, 2026 12:28	Victor Mercklé	CPPg++14.2.0	Success	2,656
May 29, 2026 12:22	Victor Mercklé	CPPg++14.2.0	Success	2,686
May 29, 2026 12:15	Victor Mercklé	CPPg++14.2.0	Success	2,654
May 29, 2026 12:09	Victor Mercklé	CPPg++14.2.0	Success	2,628
May 29, 2026 12:02	Victor Mercklé	CPPg++14.2.0	Success	2,595+68.55 RP
May 29, 2026 11:57	Victor Mercklé	CPPg++14.2.0	Success	2,737
May 29, 2026 11:47	Victor Mercklé	CPPg++14.2.0	Success	2,746
May 29, 2026 11:45	Victor Mercklé	CPPg++14.2.0	Success	2,744
May 29, 2026 11:42	Victor Mercklé	CPPg++14.2.0	Success	2,738
May 29, 2026 11:40	Victor Mercklé	CPPg++14.2.0	Success	2,743
May 29, 2026 11:37	Victor Mercklé	CPPg++14.2.0	Success	2,642+4.29 RP
May 29, 2026 11:34	Victor Mercklé	CPPg++14.2.0	Success	2,760
May 29, 2026 11:31	Victor Mercklé	CPPg++14.2.0	Success	2,650
May 29, 2026 11:27	Victor Mercklé	CPPg++14.2.0	Success	2,742
May 29, 2026 11:20	Victor Mercklé	CPPg++14.2.0	Success	2,670
May 29, 2026 11:16	Victor Mercklé	CPPg++14.2.0	Success	2,707
May 29, 2026 10:37	Victor Mercklé	CPPg++14.2.0	Success	2,734
May 29, 2026 10:35	Victor Mercklé	CPPg++14.2.0	Success	2,703
May 29, 2026 10:30	Victor Mercklé	CPPg++14.2.0	Success	2,729
May 29, 2026 10:23	Victor Mercklé	CPPg++14.2.0	Success	2,645+12.82 RP
May 29, 2026 10:21	Victor Mercklé	CPPg++14.2.0	Success	2,654+1.42 RP
May 29, 2026 10:17	Victor Mercklé	CPPg++14.2.0	Success	2,791
May 29, 2026 10:15	Victor Mercklé	CPPg++14.2.0	Success	2,655+33.74 RP
May 29, 2026 10:10	Victor Mercklé	CPPg++14.2.0	Success	2,679+50.85 RP
May 29, 2026 10:08	Victor Mercklé	CPPg++14.2.0	Success	2,832
May 29, 2026 09:57	Victor Mercklé	CPPg++14.2.0	Success	2,716+4.06 RP
May 29, 2026 09:55	Victor Mercklé	CPPg++14.2.0	Success	2,776
May 29, 2026 09:52	Victor Mercklé	CPPg++14.2.0	Success	2,835
May 29, 2026 09:50	Victor Mercklé	CPPg++14.2.0	Success	3,087+5.00 RP
May 29, 2026 09:16	Elijah Kin	CPPg++14.2.0	Success	5,005
May 29, 2026 08:23	Elijah Kin	CPPg++14.2.0	Success	5,026
May 29, 2026 08:11	Elijah Kin	CPPg++14.2.0	Success	8,358
May 29, 2026 06:29	Elijah Kin	CPPclang++18.1.3	Success	7,531
May 29, 2026 06:05	Elijah Kin	CPPclang++20.1.2	Success	7,581
May 29, 2026 05:59	Elijah Kin	CPPg++14.2.0	Success	4,937+20.31 RP
May 29, 2026 05:37	Elijah Kin	CPPg++14.2.0	Success	5,274
May 29, 2026 05:22	Elijah Kin	CPPg++14.2.0	Success	5,416
May 29, 2026 05:19	Elijah Kin	CPPg++14.2.0	Success	5,127
May 29, 2026 03:38	Elijah Kin	CPPg++14.2.0	Success	4,987+255.21 RP
May 28, 2026 03:33	Elijah Kin	CPPg++14.2.0	Success	5,698+145.47 RP
May 27, 2026 18:52	Elijah Kin	CPPg++14.2.0	Success	6,405
May 27, 2026 18:33	Elijah Kin	CPPg++14.2.0	Success	6,287
May 27, 2026 18:29	Elijah Kin	CPPg++13.3.0	Success	6,629
May 27, 2026 18:26	Elijah Kin	CPPg++14.2.0	Success	6,213+108.48 RP
May 27, 2026 18:23	Elijah Kin	CPPg++14.2.0	Success	6,662+17.81 RP
May 27, 2026 17:01	Elijah Kin	CPPclang++20.1.2	Success	11,103
May 27, 2026 16:59	Elijah Kin	CPPg++14.2.0	Success	6,742+35.64 RP
May 27, 2026 16:46	Elijah Kin	CPPg++14.2.0	Success	6,908+376.70 RP
May 26, 2026 17:19	Elijah Kin	CPPg++14.2.0	Success	9,854
May 26, 2026 17:04	Elijah Kin	CPPg++14.2.0	Success	9,338+93.57 RP
May 26, 2026 17:02	Elijah Kin	CPPclang++20.1.2	Success	11,061
May 26, 2026 16:48	Elijah Kin	CPPclang++20.1.2	Success	11,166
May 25, 2026 22:14	Elijah Kin	CPPclang++20.1.2	Success	13,925
May 22, 2026 13:11	M-Rochat	CPPclang++17.0.6	Success	4,307
May 22, 2026 13:09	M-Rochat	CPPclang++17.0.6	Success	4,307
May 22, 2026 13:08	M-Rochat	CPPclang++17.0.6	Success	4,317
May 22, 2026 13:07	M-Rochat	CPPclang++17.0.6	Success	4,302+4.31 RP
May 22, 2026 13:04	M-Rochat	CPPclang++17.0.6	Success	4,310+32.90 RP
May 22, 2026 13:03	M-Rochat	CPPclang++17.0.6	Success	4,481
May 22, 2026 13:02	M-Rochat	CPPclang++17.0.6	Success	4,498
May 22, 2026 13:00	M-Rochat	CPPclang++20.1.2	Success	4,496
May 22, 2026 12:58	M-Rochat	CPPclang++17.0.6	Success	4,472
May 22, 2026 12:57	M-Rochat	CPPclang++17.0.6	Success	4,441
May 22, 2026 12:55	M-Rochat	CPPclang++17.0.6	Success	4,487
May 22, 2026 12:54	M-Rochat	CPPclang++17.0.6	Success	4,495
May 22, 2026 12:52	M-Rochat	CPPclang++17.0.6	Success	4,372+1.57 RP
May 22, 2026 12:50	M-Rochat	CPPclang++17.0.6	Success	4,688
May 22, 2026 09:56	M-Rochat	CPPclang++17.0.6	Success	4,699
May 22, 2026 09:54	M-Rochat	CPPg++13.3.0	Success	4,673
May 22, 2026 09:53	M-Rochat	CPPclang++17.0.6	Success	4,568
May 22, 2026 09:51	M-Rochat	CPPclang++17.0.6	Success	4,692
May 22, 2026 09:50	M-Rochat	CPPclang++17.0.6	Success	4,689
May 22, 2026 09:48	M-Rochat	CPPclang++20.1.2	Success	4,682
May 22, 2026 09:47	M-Rochat	CPPclang++17.0.6	Success	4,762
May 22, 2026 09:45	M-Rochat	CPPclang++17.0.6	Success	4,674
May 22, 2026 09:43	M-Rochat	CPPclang++17.0.6	Success	4,737
May 22, 2026 09:41	M-Rochat	CPPclang++17.0.6	Success	4,684
May 21, 2026 22:23	Jacob McDaniel	CPPg++14.2.0	Success	2,922
May 21, 2026 22:07	Jacob McDaniel	CPPclang++20.1.2	Success	2,726
May 21, 2026 22:06	Jacob McDaniel	CPPg++12.4.0	Success	2,509
May 21, 2026 22:06	Jacob McDaniel	CPPg++13.3.0	Success	2,476
May 21, 2026 21:57	Jacob McDaniel	CPPg++14.2.0	Success	2,548
May 21, 2026 21:56	Jacob McDaniel	CPPg++14.2.0	Success	2,467
May 21, 2026 21:56	Jacob McDaniel	CPPg++14.2.0	Success	2,516

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