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 27, 2026 21:05	Elijah Kin	CPPg++14.2.0	Success	3,132
Aug 27, 2026 20:59	Elijah Kin	CPPg++14.2.0	Success	2,326
Aug 27, 2026 20:55	Elijah Kin	CPPg++14.2.0	Success	3,075
Aug 27, 2026 20:52	Elijah Kin	CPPg++14.2.0	Success	2,292
Aug 27, 2026 20:51	Elijah Kin	CPPg++14.2.0	Success	2,236
Aug 27, 2026 18:24	Elijah Kin	CPPg++14.2.0	Success	2,578
Aug 27, 2026 18:22	Elijah Kin	CPPg++14.2.0	Success	2,281
Aug 27, 2026 18:02	Elijah Kin	CPPg++14.2.0	Success	2,429
Aug 27, 2026 17:59	Elijah Kin	CPPg++14.2.0	Success	2,374
Aug 27, 2026 17:56	Elijah Kin	CPPg++14.2.0	Success	2,391
Aug 27, 2026 17:51	Elijah Kin	CPPg++14.2.0	Success	2,504
Aug 27, 2026 17:43	Elijah Kin	CPPg++14.2.0	Success	2,292
Aug 27, 2026 17:41	Elijah Kin	CPPg++14.2.0	Success	2,680
Aug 27, 2026 17:36	Elijah Kin	CPPg++14.2.0	Error
Aug 27, 2026 17:34	Elijah Kin	CPPg++14.2.0	Success	2,310
Aug 27, 2026 17:31	Elijah Kin	CPPg++14.2.0	Success	2,285
Aug 27, 2026 17:29	Elijah Kin	CPPg++14.2.0	Success	2,422
Aug 27, 2026 17:27	Elijah Kin	CPPg++14.2.0	Error
Aug 27, 2026 17:11	Elijah Kin	CPPg++14.2.0	Success	2,272
Aug 27, 2026 17:09	Elijah Kin	CPPg++14.2.0	Success	2,320
Aug 27, 2026 17:00	Elijah Kin	CPPg++14.2.0	Success	3,086
Aug 27, 2026 16:57	Elijah Kin	CPPg++14.2.0	Success	2,244
Aug 27, 2026 16:51	Elijah Kin	CPPg++14.2.0	Success	2,290
Aug 27, 2026 16:47	Elijah Kin	CPPg++14.2.0	Success	2,230
Aug 24, 2026 02:01	Andrew Epstein	CPPg++14.2.0	Success	1,653+585.13 RP
Aug 23, 2026 14:40	Andrew Epstein	CPPg++14.2.0	Success	1,830+256.15 RP
Aug 23, 2026 04:31	Andrew Epstein	CPPg++14.2.0	Success	1,920+21.61 RP
Aug 23, 2026 04:00	Andrew Epstein	CPPg++14.2.0	Success	1,930
Aug 23, 2026 03:56	Andrew Epstein	CPPg++14.2.0	Success	1,928+1'550.36 RP
Aug 23, 2026 03:31	Andrew Epstein	CPPg++14.2.0	Success	2,750+89.01 RP
Aug 23, 2026 03:30	Andrew Epstein	CPPg++14.2.0	Success	2,958
Aug 23, 2026 03:22	Andrew Epstein	CPPg++14.2.0	Success	2,819+533.49 RP
Aug 23, 2026 02:59	Andrew Epstein	CPPg++14.2.0	Success	3,318+3'004.66 RP
Aug 21, 2026 19:30	Andrew Epstein	CPPg++14.2.0	Success	1,086,691+9.20 RP
Aug 19, 2026 00:38	Victor Mercklé	GOgo1.26.2	Success	2,574
Aug 19, 2026 00:30	Victor Mercklé	CSHARP10.0.7	Success	2,906
Aug 18, 2026 07:35	Victor Mercklé	GOgo1.26.2	Success	2,519
Aug 18, 2026 03:46	Victor Mercklé	CSHARP10.0.7	Success	2,900+5.00 RP
Aug 17, 2026 13:00	Victor Mercklé	CSHARP10.0.7	Success	3,016
Aug 17, 2026 01:56	Victor Mercklé	CSHARP10.0.7	Success	3,479
Aug 17, 2026 01:36	Victor Mercklé	CSHARP10.0.7	Success	2,850+311.84 RP
Aug 17, 2026 01:13	Victor Mercklé	CSHARP10.0.7	Success	3,128+16.27 RP
Aug 17, 2026 00:04	Victor Mercklé	CSHARP10.0.7	Success	4,086
Aug 16, 2026 23:09	Tomislav Tunkovic	GOgo1.26.2	Success	6,251
Aug 16, 2026 23:08	Tomislav Tunkovic	ZIG0.15.1	Success	2,479
Aug 16, 2026 23:08	Tomislav Tunkovic	RUSTrust-1.95.0	Success	2,787
Aug 16, 2026 13:17	marko1597	CPPg++13.3.0	Success	1,654
Aug 16, 2026 09:04	marko1597	CPPg++13.3.0	Success	1,517+242.73 RP
Aug 16, 2026 08:26	marko1597	CPPg++14.2.0	Success	1,554+231.53 RP
Aug 16, 2026 08:00	marko1597	CPPg++13.3.0	Success	1,623
Aug 16, 2026 07:33	marko1597	CPPg++13.3.0	Success	1,700
Aug 16, 2026 07:11	marko1597	CPPg++12.4.0	Success	1,710
Aug 16, 2026 00:03	marko1597	CPPg++13.3.0	Success	1,612+226.19 RP
Aug 15, 2026 23:53	marko1597	CPPg++12.4.0	Success	1,673+74.10 RP
Aug 15, 2026 23:34	marko1597	CPPg++14.2.0	Success	1,700
Aug 15, 2026 23:15	marko1597	CPPg++13.3.0	Success	1,699
Aug 15, 2026 22:50	marko1597	CPPg++14.2.0	Success	1,701
Aug 15, 2026 22:30	marko1597	CPPg++14.2.0	Success	1,694+253.47 RP
Aug 15, 2026 22:22	marko1597	CPPg++14.2.0	Error
Aug 15, 2026 22:20	marko1597	CPPg++14.2.0	Success	1,976
Aug 15, 2026 22:08	marko1597	CPPg++14.2.0	Success	1,888
Aug 15, 2026 17:32	Tomislav Tunkovic	CPPg++14.2.0	Success	1,537+417.90 RP
Aug 15, 2026 17:28	Tomislav Tunkovic	CPPg++14.2.0	Success	1,588+70.58 RP
Aug 15, 2026 17:24	Tomislav Tunkovic	CPPg++14.2.0	Success	1,639
Aug 15, 2026 17:05	Tomislav Tunkovic	CPPg++13.3.0	Success	1,704
Aug 15, 2026 17:03	Tomislav Tunkovic	CPPg++13.3.0	Success	2,144
Aug 15, 2026 16:58	Tomislav Tunkovic	CPPg++13.3.0	Success	2,014
Aug 15, 2026 16:54	Tomislav Tunkovic	CPPg++13.3.0	Success	1,720
Aug 15, 2026 16:48	Tomislav Tunkovic	CPPg++13.3.0	Success	1,665
Aug 15, 2026 16:42	Tomislav Tunkovic	CPPg++13.3.0	Success	1,646
Aug 15, 2026 16:40	Tomislav Tunkovic	CPPg++13.3.0	Success	1,606+110.44 RP
Aug 15, 2026 16:23	Tomislav Tunkovic	CPPg++14.2.0	Success	1,708
Aug 15, 2026 16:19	Tomislav Tunkovic	CPPg++13.3.0	Success	1,635+135.35 RP
Aug 15, 2026 16:13	Tomislav Tunkovic	CPPg++13.3.0	Success	1,672+256.76 RP
Aug 15, 2026 16:05	Tomislav Tunkovic	CPPg++13.3.0	Success	1,747+350.64 RP
Aug 15, 2026 15:53	Tomislav Tunkovic	CPPg++13.3.0	Success	1,861+165.12 RP
Aug 15, 2026 15:44	Tomislav Tunkovic	CPPg++13.3.0	Success	1,920+198.31 RP
Aug 15, 2026 15:32	Tomislav Tunkovic	CPPg++13.3.0	Success	2,033
Aug 15, 2026 15:11	Tomislav Tunkovic	CPPg++13.3.0	Success	1,996+141.47 RP
Aug 15, 2026 10:45	Tomislav Tunkovic	CPPg++13.3.0	Success	2,330
Aug 15, 2026 10:41	Tomislav Tunkovic	CPPclang++18.1.3	Success	2,080
Aug 15, 2026 10:34	Tomislav Tunkovic	CPPg++12.4.0	Success	2,334
Aug 15, 2026 10:30	Tomislav Tunkovic	CPPg++13.3.0	Success	2,054+60.86 RP
Aug 15, 2026 10:17	Tomislav Tunkovic	CPPg++14.2.0	Success	2,080+425.57 RP
Aug 15, 2026 10:10	Tomislav Tunkovic	CPPg++14.2.0	Success	2,282+720.46 RP
Aug 15, 2026 09:55	Tomislav Tunkovic	CPPg++14.2.0	Success	2,731+179.77 RP
Aug 15, 2026 09:27	Tomislav Tunkovic	CPPg++14.2.0	Success	3,034
Aug 14, 2026 20:17	marko1597	CPPg++13.3.0	Success	1,924
Aug 14, 2026 19:48	marko1597	CPPg++14.2.0	Success	1,903
Aug 14, 2026 19:14	marko1597	CPPg++14.2.0	Success	1,931
Aug 14, 2026 18:53	marko1597	CPPg++14.2.0	Success	1,820
Aug 14, 2026 18:46	marko1597	CPPg++14.2.0	Success	1,954
Aug 14, 2026 18:41	marko1597	CPPg++14.2.0	Success	1,981
Aug 14, 2026 18:25	marko1597	CPPg++13.3.0	Success	1,813
Aug 14, 2026 18:23	marko1597	CPPclang++20.1.2	Error
Aug 14, 2026 18:13	marko1597	CPPg++14.2.0	Error
Aug 14, 2026 18:03	marko1597	CPPg++14.2.0	Success	1,770+1'578.06 RP
Aug 14, 2026 17:54	marko1597	CPPg++14.2.0	Success	2,456+100.26 RP
Aug 14, 2026 17:51	marko1597	CPPg++14.2.0	Success	2,518+245.62 RP
Aug 14, 2026 17:42	marko1597	CPPg++14.2.0	Success	2,684+118.28 RP

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