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 4, 2026 01:30	Victor Mercklé	GOgo1.26.2	Success	2,830
Aug 4, 2026 00:19	Victor Mercklé	CSHARP10.0.7	Success	3,460
Aug 2, 2026 18:56	Victor Mercklé	CPPg++14.2.0	Success	1,690
Aug 2, 2026 17:53	Victor Mercklé	CPPg++14.2.0	Success	1,694
Aug 2, 2026 17:15	Victor Mercklé	CPPg++14.2.0	Success	1,698
Aug 1, 2026 20:05	Victor Mercklé	CPPg++14.2.0	Success	1,655
Aug 1, 2026 19:32	Victor Mercklé	CPPg++14.2.0	Success	1,748
Aug 1, 2026 18:46	Victor Mercklé	CPPg++14.2.0	Success	1,703
Aug 1, 2026 18:33	Victor Mercklé	CPPg++14.2.0	Success	1,725
Aug 1, 2026 05:35	Victor Mercklé	CPPg++14.2.0	Success	1,696
Aug 1, 2026 05:18	Victor Mercklé	CPPg++14.2.0	Success	1,814
Aug 1, 2026 05:03	Victor Mercklé	CPPg++14.2.0	Success	1,685
Aug 1, 2026 04:52	Victor Mercklé	CPPg++14.2.0	Success	1,676
Aug 1, 2026 04:46	Victor Mercklé	CPPg++14.2.0	Success	1,806
Jul 31, 2026 06:15	Tony	CPPg++10.5.0	Success	1,573,112+6.36 RP
Jul 30, 2026 21:53	Andrew Tsibin	RUSTrust-1.95.0	Success	1,906+203.73 RP
Jul 30, 2026 21:46	Andrew Tsibin	RUSTrust-1.95.0	Success	1,983+67.74 RP
Jul 30, 2026 21:43	Andrew Tsibin	RUSTrust-1.95.0	Success	2,010+80.36 RP
Jul 30, 2026 21:40	Andrew Tsibin	RUSTrust-1.95.0	Success	2,043+126.05 RP
Jul 30, 2026 21:35	Andrew Tsibin	RUSTrust-1.95.0	Success	2,097+173.13 RP
Jul 30, 2026 21:34	Andrew Tsibin	RUSTrust-1.95.0	Error
Jul 30, 2026 21:32	Andrew Tsibin	RUSTrust-1.95.0	Success	484,326
Jul 30, 2026 21:31	Andrew Tsibin	RUSTrust-1.95.0	Error
Jul 30, 2026 21:30	Andrew Tsibin	RUSTrust-1.95.0	Success	2,176+722.62 RP
Jul 30, 2026 21:23	Andrew Tsibin	RUSTrust-1.95.0	Success	2,582+1'562.96 RP
Jul 17, 2026 21:19	Elijah Kin	CPPg++14.2.0	Success	2,929
Jul 17, 2026 19:08	Elijah Kin	CPPg++14.2.0	Success	2,202
Jul 16, 2026 20:16	Andrew Tsibin	RUSTrust-1.95.0	Success	4,329+73.37 RP
Jul 16, 2026 19:53	Andrew Tsibin	RUSTrust-1.97.0	Success	4,552
Jul 16, 2026 18:50	Andrew Tsibin	RUSTrust-1.97.0	Success	4,471+1'520.77 RP
Jul 16, 2026 18:11	Andrew Tsibin	RUSTrust-1.97.0	Success	13,969+715.87 RP
Jul 16, 2026 17:26	Andrew Tsibin	RUSTrust-1.95.0	Error
Jul 14, 2026 07:40	Victor Mercklé	CPPg++14.2.0	Success	1,706
Jul 14, 2026 07:35	Victor Mercklé	CPPg++14.2.0	Success	1,678
Jul 14, 2026 07:30	Victor Mercklé	CPPg++14.2.0	Success	1,747
Jul 14, 2026 07:25	Victor Mercklé	CPPg++14.2.0	Success	1,760
Jul 14, 2026 07:20	Victor Mercklé	CPPg++14.2.0	Success	2,095
Jul 9, 2026 01:11	Victor Mercklé	GOgo1.26.2	Success	2,238+247.08 RP
Jul 9, 2026 00:57	Victor Mercklé	CSHARP10.0.7	Success	4,103
Jul 8, 2026 15:05	Victor Mercklé	GOgo1.26.2	Success	2,430
Jul 8, 2026 14:51	Victor Mercklé	CSHARP10.0.7	Success	3,583
Jul 8, 2026 12:22	Victor Mercklé	GOgo1.26.2	Success	2,369+195.43 RP
Jul 8, 2026 11:33	Victor Mercklé	CSHARP10.0.7	Success	4,094
Jul 8, 2026 11:21	Victor Mercklé	GOgo1.26.2	Success	2,578
Jul 8, 2026 08:52	Victor Mercklé	CSHARP10.0.7	Success	3,263
Jul 8, 2026 08:42	Victor Mercklé	GOgo1.26.2	Success	2,823
Jul 8, 2026 06:48	Victor Mercklé	CSHARP10.0.7	Success	3,408
Jul 8, 2026 06:37	Victor Mercklé	GOgo1.26.2	Success	2,484+48.04 RP
Jul 8, 2026 02:37	Victor Mercklé	CPPg++14.2.0	Success	1,650
Jul 8, 2026 02:27	Victor Mercklé	CPPg++14.2.0	Success	1,601
Jul 8, 2026 02:18	Victor Mercklé	CPPg++14.2.0	Success	1,650
Jul 8, 2026 01:49	Victor Mercklé	CPPg++14.2.0	Success	1,606
Jul 8, 2026 01:38	Victor Mercklé	CPPg++14.2.0	Success	1,652
Jul 8, 2026 01:19	Victor Mercklé	CPPg++14.2.0	Success	1,639
Jul 8, 2026 00:40	Victor Mercklé	CSHARP10.0.7	Success	3,469
Jul 8, 2026 00:24	Victor Mercklé	GOgo1.26.2	Success	2,687
Jul 8, 2026 00:03	Victor Mercklé	RUSTrust-1.95.0	Success	1,660+260.41 RP
Jul 7, 2026 23:09	Victor Mercklé	CPPg++14.2.0	Success	1,603
Jul 7, 2026 23:01	Victor Mercklé	CPPg++14.2.0	Success	1,588+94.46 RP
Jul 7, 2026 22:48	Victor Mercklé	CPPg++14.2.0	Success	1,634
Jul 7, 2026 22:37	Victor Mercklé	CPPg++14.2.0	Success	1,608
Jul 7, 2026 22:20	Victor Mercklé	CPPg++14.2.0	Success	1,624
Jul 7, 2026 22:01	Victor Mercklé	CPPg++14.2.0	Success	1,781
Jul 7, 2026 21:45	Victor Mercklé	CPPg++14.2.0	Success	1,751
Jul 7, 2026 21:21	Victor Mercklé	CPPg++14.2.0	Success	1,658
Jul 7, 2026 21:05	Victor Mercklé	CPPg++14.2.0	Success	1,678
Jul 7, 2026 20:48	Victor Mercklé	CPPg++14.2.0	Success	1,600+184.72 RP
Jul 7, 2026 20:26	Victor Mercklé	CPPg++14.2.0	Success	1,635
Jul 7, 2026 19:51	Victor Mercklé	CSHARP10.0.7	Success	4,155
Jul 7, 2026 19:37	Victor Mercklé	GOgo1.26.2	Success	2,525
Jul 7, 2026 18:28	Victor Mercklé	CSHARP10.0.7	Success	3,144+122.56 RP
Jul 7, 2026 18:19	Victor Mercklé	CSHARP10.0.7	Success	3,294
Jul 7, 2026 18:09	Victor Mercklé	GOgo1.26.2	Success	2,529
Jul 7, 2026 17:45	Victor Mercklé	CSHARP10.0.7	Success	3,312
Jul 7, 2026 17:32	Victor Mercklé	GOgo1.26.2	Success	2,514+6.32 RP
Jul 7, 2026 16:49	Victor Mercklé	CSHARP10.0.7	Success	3,493
Jul 7, 2026 16:01	Victor Mercklé	GOgo1.26.2	Success	2,790
Jul 7, 2026 15:25	Victor Mercklé	GOgo1.26.2	Success	2,892
Jul 7, 2026 05:20	Victor Mercklé	CSHARP10.0.7	Success	3,431
Jul 7, 2026 01:51	Victor Mercklé	GOgo1.26.2	Success	2,844
Jul 5, 2026 22:10	Victor Mercklé	CPPg++14.2.0	Success	1,658
Jul 5, 2026 21:59	Victor Mercklé	CPPg++14.2.0	Success	1,702
Jul 5, 2026 21:52	Victor Mercklé	CPPg++14.2.0	Success	1,730
Jul 5, 2026 18:31	Victor Mercklé	CPPg++14.2.0	Success	1,670
Jul 5, 2026 18:19	Victor Mercklé	CPPg++14.2.0	Success	1,667
Jul 5, 2026 18:00	Victor Mercklé	CPPg++14.2.0	Success	1,652
Jul 5, 2026 17:51	Victor Mercklé	CPPg++14.2.0	Success	1,649
Jul 5, 2026 17:39	Victor Mercklé	CPPg++14.2.0	Success	1,624+142.42 RP
Jul 5, 2026 17:25	Victor Mercklé	CPPg++14.2.0	Success	1,713
Jul 5, 2026 17:10	Victor Mercklé	CPPg++14.2.0	Success	1,676
Jul 2, 2026 10:07	A_Shaman	CPPg++10.5.0	Success	12,946+2.73 RP
Jul 2, 2026 10:02	A_Shaman	CPPg++10.5.0	Success	12,992+9.42 RP
Jul 2, 2026 09:56	A_Shaman	CPPg++10.5.0	Success	14,162
Jul 2, 2026 09:51	A_Shaman	CPPg++10.5.0	Success	13,517
Jul 2, 2026 09:46	A_Shaman	CPPg++10.5.0	Success	15,246
Jul 2, 2026 09:43	A_Shaman	CPPg++10.5.0	Success	13,402
Jul 2, 2026 09:39	A_Shaman	CPPg++10.5.0	Success	13,153+98.43 RP
Jul 2, 2026 09:35	A_Shaman	CPPg++10.5.0	Success	15,289
Jul 2, 2026 09:31	A_Shaman	CPPg++10.5.0	Success	15,109+29.03 RP
Jul 2, 2026 09:24	A_Shaman	CPPg++10.5.0	Success	16,042

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