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 28, 2026 01:33	Victor Mercklé	CSHARP10.0.7	Success	3,535
Jun 28, 2026 00:38	Victor Mercklé	GOgo1.26.2	Success	2,518+176.34 RP
Jun 27, 2026 19:05	Elijah Kin	CPPg++14.2.0	Success	2,030+24.15 RP
Jun 27, 2026 18:57	Elijah Kin	CPPg++14.2.0	Success	2,238
Jun 27, 2026 18:52	Elijah Kin	CPPg++14.2.0	Success	2,086
Jun 27, 2026 18:25	Elijah Kin	CPPg++14.2.0	Success	2,259
Jun 27, 2026 18:20	Elijah Kin	CPPg++14.2.0	Success	2,080
Jun 27, 2026 05:53	Elijah Kin	CPPg++14.2.0	Success	2,196
Jun 27, 2026 05:02	Victor Mercklé	GOgo1.26.2	Success	2,755
Jun 27, 2026 04:58	Elijah Kin	CPPg++14.2.0	Success	2,301
Jun 27, 2026 04:50	Elijah Kin	CPPg++14.2.0	Success	2,286
Jun 27, 2026 04:42	Victor Mercklé	GOgo1.26.2	Success	2,801
Jun 27, 2026 04:22	Victor Mercklé	GOgo1.26.2	Success	2,659
Jun 27, 2026 04:01	Victor Mercklé	GOgo1.26.2	Success	2,635+308.32 RP
Jun 27, 2026 03:40	Victor Mercklé	GOgo1.26.2	Success	2,934
Jun 27, 2026 01:56	Victor Mercklé	CSHARP10.0.7	Success	3,270+17.67 RP
Jun 27, 2026 01:51	Victor Mercklé	CSHARP10.0.7	Success	3,289+129.23 RP
Jun 27, 2026 01:46	Victor Mercklé	CSHARP10.0.7	Success	3,435+4.23 RP
Jun 27, 2026 01:37	Victor Mercklé	CSHARP10.0.7	Success	3,487
Jun 27, 2026 01:20	Victor Mercklé	CSHARP10.0.7	Success	3,556
Jun 27, 2026 00:55	Victor Mercklé	GOgo1.26.2	Success	3,052
Jun 27, 2026 00:24	Victor Mercklé	GOgo1.26.2	Success	2,868+95.77 RP
Jun 26, 2026 23:52	Victor Mercklé	GOgo1.26.2	Success	3,788
Jun 26, 2026 20:00	A_Shaman	CPPg++10.5.0	Success	16,200
Jun 26, 2026 19:56	A_Shaman	CPPg++10.5.0	Success	15,802+8.85 RP
Jun 26, 2026 19:53	A_Shaman	CPPg++10.5.0	Success	16,026+15.34 RP
Jun 26, 2026 19:51	A_Shaman	CPPg++10.5.0	Success	16,528
Jun 26, 2026 19:49	A_Shaman	CPPg++10.5.0	Success	16,430+1.40 RP
Jun 21, 2026 17:42	A_Shaman	CPPg++10.5.0	Success	17,363
Jun 21, 2026 17:40	A_Shaman	CPPg++10.5.0	Success	16,468+24.28 RP
Jun 21, 2026 17:36	A_Shaman	CPPg++10.5.0	Success	17,334
Jun 21, 2026 17:35	A_Shaman	CPPg++10.5.0	Success	17,154+63.39 RP
Jun 21, 2026 17:32	A_Shaman	CPPg++10.5.0	Success	19,247+50.39 RP
Jun 21, 2026 17:28	A_Shaman	CPPg++10.5.0	Success	21,314+46.07 RP
Jun 21, 2026 17:26	A_Shaman	CPPg++10.5.0	Success	23,934
Jun 21, 2026 17:23	A_Shaman	CPPg++10.5.0	Error
Jun 21, 2026 17:20	A_Shaman	CPPg++10.5.0	Success	27,582
Jun 21, 2026 17:17	A_Shaman	CPPg++10.5.0	Error
Jun 21, 2026 17:17	A_Shaman	CPPg++10.5.0	Error
Jun 20, 2026 17:16	A_Shaman	CPPg++10.5.0	Success	50,809
Jun 20, 2026 17:13	A_Shaman	CPPg++10.5.0	Success	112,544
Jun 20, 2026 17:06	A_Shaman	CPPg++10.5.0	Success	105,054
Jun 20, 2026 17:04	A_Shaman	CPPg++10.5.0	Error
Jun 20, 2026 17:02	A_Shaman	CPPg++10.5.0	Success	23,635+423.10 RP
Jun 20, 2026 07:43	A_Shaman	CPPg++10.5.0	Error
Jun 16, 2026 06:40	Victor Mercklé	ZIG0.16.0	Success	1,758
Jun 16, 2026 06:15	Victor Mercklé	ZIG0.16.0	Success	1,763
Jun 16, 2026 05:49	Victor Mercklé	ZIG0.16.0	Success	1,724
Jun 16, 2026 05:22	Victor Mercklé	ZIG0.16.0	Success	1,732
Jun 16, 2026 04:51	Victor Mercklé	ZIG0.16.0	Success	1,702+287.57 RP
Jun 16, 2026 02:23	Victor Mercklé	ZIG0.16.0	Success	1,869
Jun 16, 2026 01:10	Victor Mercklé	ZIG0.16.0	Success	1,831
Jun 15, 2026 22:00	Victor Mercklé	ZIG0.16.0	Success	1,852
Jun 15, 2026 21:31	Victor Mercklé	ZIG0.16.0	Success	1,864
Jun 15, 2026 21:05	Victor Mercklé	ZIG0.16.0	Success	1,841
Jun 15, 2026 20:38	Victor Mercklé	ZIG0.16.0	Success	1,768+25.48 RP
Jun 15, 2026 20:09	Victor Mercklé	ZIG0.16.0	Success	1,859
Jun 15, 2026 19:43	Victor Mercklé	ZIG0.16.0	Success	1,776
Jun 15, 2026 19:16	Victor Mercklé	ZIG0.16.0	Success	1,810
Jun 15, 2026 16:49	Victor Mercklé	ZIG0.16.0	Success	1,814
Jun 15, 2026 16:37	Victor Mercklé	ZIG0.16.0	Success	1,776+154.18 RP
Jun 15, 2026 16:13	Victor Mercklé	ZIG0.16.0	Success	1,826+20.91 RP
Jun 15, 2026 13:40	Victor Mercklé	ZIG0.16.0	Success	1,860
Jun 15, 2026 13:19	Victor Mercklé	ZIG0.16.0	Success	1,833+26.66 RP
Jun 15, 2026 12:51	Victor Mercklé	ZIG0.16.0	Success	2,264
Jun 14, 2026 14:57	Victor Mercklé	RUSTrust-1.95.0	Success	1,782
Jun 14, 2026 13:35	Victor Mercklé	RUSTrust-1.95.0	Success	1,870
Jun 14, 2026 12:47	Victor Mercklé	RUSTrust-1.95.0	Success	1,765
Jun 14, 2026 11:48	Victor Mercklé	RUSTrust-1.95.0	Success	1,735+251.01 RP
Jun 14, 2026 11:10	Victor Mercklé	RUSTrust-1.95.0	Success	1,814+74.94 RP
Jun 14, 2026 10:50	Victor Mercklé	RUSTrust-1.95.0	Success	1,839+2'028.26 RP
Jun 14, 2026 08:50	Victor Mercklé	ZIG0.16.0	Success	1,874
Jun 14, 2026 08:25	Victor Mercklé	ZIG0.16.0	Success	1,862
Jun 14, 2026 08:06	Victor Mercklé	ZIG0.16.0	Success	1,874
Jun 14, 2026 07:45	Victor Mercklé	ZIG0.16.0	Success	1,853
Jun 14, 2026 07:23	Victor Mercklé	ZIG0.16.0	Success	1,842+1'474.75 RP
Jun 14, 2026 03:45	Victor Mercklé	RUSTrust-1.95.0	Success	5,448
Jun 14, 2026 03:40	Victor Mercklé	RUSTrust-1.95.0	Success	5,440
Jun 14, 2026 03:35	Victor Mercklé	RUSTrust-1.95.0	Success	5,409
Jun 14, 2026 03:24	Victor Mercklé	RUSTrust-1.95.0	Success	5,488
Jun 14, 2026 03:19	Victor Mercklé	RUSTrust-1.95.0	Success	5,961
Jun 14, 2026 03:14	Victor Mercklé	RUSTrust-1.95.0	Success	6,729
Jun 14, 2026 03:02	Victor Mercklé	RUSTrust-1.95.0	Success	5,518
Jun 14, 2026 02:56	Victor Mercklé	RUSTrust-1.95.0	Success	5,748
Jun 14, 2026 02:51	Victor Mercklé	RUSTrust-1.95.0	Success	5,965
Jun 14, 2026 02:40	Victor Mercklé	RUSTrust-1.95.0	Success	5,807
Jun 14, 2026 02:32	Victor Mercklé	RUSTrust-1.95.0	Success	5,964
Jun 14, 2026 02:27	Victor Mercklé	RUSTrust-1.95.0	Success	5,621
Jun 14, 2026 02:15	Victor Mercklé	RUSTrust-1.95.0	Success	5,649
Jun 14, 2026 02:10	Victor Mercklé	RUSTrust-1.95.0	Success	5,781
Jun 14, 2026 02:01	Victor Mercklé	RUSTrust-1.95.0	Success	5,782
Jun 14, 2026 01:49	Victor Mercklé	RUSTrust-1.95.0	Success	6,220
Jun 14, 2026 01:46	Victor Mercklé	RUSTrust-1.95.0	Success	6,270
Jun 14, 2026 01:39	Victor Mercklé	RUSTrust-1.95.0	Success	6,368
Jun 14, 2026 01:28	Victor Mercklé	RUSTrust-1.95.0	Success	5,976
Jun 14, 2026 01:23	Victor Mercklé	RUSTrust-1.95.0	Success	6,330
Jun 14, 2026 01:18	Victor Mercklé	RUSTrust-1.95.0	Success	6,121
Jun 14, 2026 01:07	Victor Mercklé	RUSTrust-1.95.0	Success	5,795
Jun 14, 2026 01:00	Victor Mercklé	RUSTrust-1.95.0	Success	5,941
Jun 14, 2026 00:55	Victor Mercklé	RUSTrust-1.95.0	Success	5,792

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