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	1:20.1.2-0ubuntu1~24.04.2	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.
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	3.0.13-0ubuntu3.9	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
Apr 26, 2026 05:01	olliecrow	CPPclang++18.1.3	Success	4,663
Apr 26, 2026 04:54	olliecrow	CPPg++10.5.0	Success	4,975
Apr 26, 2026 00:35	olliecrow	RUSTrust-1.95.0	Success	4,359+45.40 RP
Apr 25, 2026 18:05	olliecrow	RUSTrust-1.95.0	Success	4,854
Apr 25, 2026 06:20	olliecrow	RUSTrust-1.95.0	Success	4,484
Apr 24, 2026 23:44	Charles Cabergs	CPPg++13.3.0	Success	7,322+125.98 RP
Apr 24, 2026 14:09	olliecrow	RUSTrust-1.95.0	Success	4,455
Apr 24, 2026 08:40	Dominique Garmier	CPPclang++20.1.2	Success	8,593
Apr 24, 2026 02:52	olliecrow	CPPclang++18.1.3	Success	4,874
Apr 23, 2026 19:01	olliecrow	CPPclang++18.1.3	Success	4,852
Apr 23, 2026 18:52	olliecrow	CPPg++10.5.0	Success	30,210
Apr 23, 2026 05:07	Charles Cabergs	CPPg++13.3.0	Success	8,066+47.31 RP
Apr 23, 2026 04:22	olliecrow	RUSTrust-1.95.0	Success	4,470
Apr 23, 2026 03:56	olliecrow	CPPclang++18.1.3	Success	4,844
Apr 22, 2026 23:23	Charles Cabergs	CPPg++13.3.0	Success	8,386+47.51 RP
Apr 22, 2026 21:47	Charles Cabergs	CPPg++13.3.0	Success	8,734+170.77 RP
Apr 22, 2026 21:15	olliecrow	RUSTrust-1.95.0	Success	4,447+29.94 RP
Apr 22, 2026 20:41	Dominique Garmier	CPPclang++20.1.2	Success	8,567
Apr 22, 2026 20:39	Dominique Garmier	CPPclang++20.1.2	Success	8,552
Apr 22, 2026 15:58	olliecrow	RUSTrust-1.95.0	Success	4,507+48.63 RP
Apr 22, 2026 15:10	Dominique Garmier	CSHARP9.0.15	Success	82,773
Apr 22, 2026 14:57	Dominique Garmier	GOgo1.26.1	Success	33,921
Apr 22, 2026 14:00	Ben	CPPclang++18.1.3	Success	28,176
Apr 22, 2026 11:45	Dominique Garmier	CPPclang++20.1.2	Success	8,577
Apr 22, 2026 05:38	olliecrow	ZIG0.14.0	Success	6,607+303.62 RP
Apr 22, 2026 05:33	olliecrow	ZIG0.14.0	Error
Apr 22, 2026 04:39	olliecrow	CSHARP9.0.15	Success	44,421
Apr 22, 2026 04:15	olliecrow	CSHARP9.0.15	Error
Apr 21, 2026 19:21	Charles Cabergs	CPPg++13.3.0	Success	11,888
Apr 21, 2026 17:22	Charles Cabergs	CPPg++13.3.0	Success	10,265+38.38 RP
Apr 21, 2026 17:10	olliecrow	CPPclang++18.1.3	Success	4,972
Apr 21, 2026 15:24	Charles Cabergs	CPPg++13.3.0	Success	10,686+43.35 RP
Apr 21, 2026 10:42	Charles Cabergs	CPPg++13.3.0	Success	11,312
Apr 21, 2026 09:51	Dominique Garmier	CPPclang++20.1.2	Success	15,866
Apr 21, 2026 09:48	Dominique Garmier	CPPclang++20.1.2	Success	16,435
Apr 21, 2026 09:24	Dominique Garmier	CPPclang++20.1.2	Success	8,598
Apr 21, 2026 09:20	Dominique Garmier	CPPclang++20.1.2	Success	8,356
Apr 21, 2026 09:19	Dominique Garmier	CPPclang++20.1.2	Error
Apr 21, 2026 09:16	Dominique Garmier	CPPclang++20.1.2	Success	8,397
Apr 21, 2026 08:51	Charles Cabergs	CPPg++13.3.0	Success	11,205+83.00 RP
Apr 21, 2026 08:30	Dominique Garmier	CPPclang++20.1.2	Success	8,344+2.01 RP
Apr 21, 2026 08:29	Dominique Garmier	CPPclang++19.1.1	Success	8,425
Apr 21, 2026 08:28	Dominique Garmier	CPPclang++20.1.2	Success	8,358+3.71 RP
Apr 21, 2026 08:27	Dominique Garmier	CPPclang++18.1.3	Success	8,448
Apr 21, 2026 08:26	Dominique Garmier	CPPg++13.3.0	Success	24,777
Apr 21, 2026 04:57	Charles Cabergs	CPPg++13.3.0	Success	14,504
Apr 21, 2026 03:20	olliecrow	CPPclang++18.1.3	Success	4,752
Apr 21, 2026 03:15	olliecrow	CPPg++10.5.0	Success	4,938
Apr 21, 2026 01:30	Taylor Dettling	RUSTrust-1.95.0	Success	401,425+24.91 RP
Apr 20, 2026 20:45	Charles Cabergs	CPPg++13.3.0	Success	12,354+25.45 RP
Apr 20, 2026 19:05	olliecrow	CPPclang++18.1.3	Success	5,149
Apr 20, 2026 16:47	Ben	CPPg++13.3.0	Success	27,562+0.08 RP
Apr 20, 2026 16:47	Ben	CPPclang++18.1.3	Success	28,566
Apr 20, 2026 16:47	Ben	CPPclang++18.1.3	Success	27,568+362.74 RP
Apr 20, 2026 16:10	olliecrow	CPPclang++18.1.3	Success	6,430
Apr 20, 2026 15:35	olliecrow	ZIG0.14.0	Success	8,514
Apr 20, 2026 15:31	olliecrow	RUSTrust-1.94.0	Success	13,410
Apr 20, 2026 13:19	Dominique Garmier	CSHARP9.0.15	Success	82,750
Apr 19, 2026 09:11	olliecrow	CPPclang++18.1.3	Success	4,966
Apr 19, 2026 09:09	olliecrow	CPPclang++18.1.3	Success	4,979
Apr 19, 2026 09:04	olliecrow	CPPclang++18.1.3	Success	4,922
Apr 19, 2026 05:11	olliecrow	CPPclang++18.1.3	Success	5,255
Apr 19, 2026 05:07	olliecrow	CPPclang++18.1.3	Success	4,985
Apr 19, 2026 03:33	olliecrow	CPPclang++18.1.3	Success	4,760
Apr 19, 2026 03:28	olliecrow	CPPclang++18.1.3	Success	5,057
Apr 19, 2026 01:00	Charles Cabergs	CPPg++13.3.0	Success	12,755+6.70 RP
Apr 18, 2026 22:43	Charles Cabergs	CPPg++13.3.0	Success	12,865+16.73 RP
Apr 18, 2026 20:27	Charles Cabergs	CPPg++13.3.0	Success	13,148+135.02 RP
Apr 18, 2026 16:07	Charles Cabergs	CPPg++13.3.0	Success	15,986+15.05 RP
Apr 18, 2026 14:23	Charles Cabergs	CPPg++13.3.0	Success	16,832
Apr 18, 2026 04:57	Charles Cabergs	CPPg++13.3.0	Success	16,380+166.37 RP
Apr 18, 2026 01:08	Charles Cabergs	CPPg++13.3.0	Success	22,516+41.45 RP
Apr 17, 2026 23:33	olliecrow	RUSTrust-1.94.0	Success	4,608+19.60 RP
Apr 17, 2026 22:46	olliecrow	RUSTrust-1.94.0	Success	4,767
Apr 17, 2026 22:41	olliecrow	RUSTrust-1.94.0	Success	4,965
Apr 17, 2026 22:29	Charles Cabergs	CPPg++13.3.0	Success	24,834+365.27 RP
Apr 17, 2026 21:05	olliecrow	RUSTrust-1.94.0	Success	13,316
Apr 17, 2026 19:21	Charles Cabergs	CPPg++13.3.0	Success	267,362+37.40 RP
Apr 17, 2026 14:04	olliecrow	RUSTrust-1.94.0	Success	4,679
Apr 17, 2026 13:34	olliecrow	GOgo1.26.1	Success	18,245+170.68 RP
Apr 17, 2026 03:08	olliecrow	RUSTrust-1.94.0	Success	4,768
Apr 17, 2026 03:02	olliecrow	RUSTrust-1.94.0	Error
Apr 17, 2026 02:57	olliecrow	CPPclang++18.1.3	Success	5,383
Apr 17, 2026 02:51	olliecrow	RUSTrust-1.94.0	Success	4,750
Apr 17, 2026 02:49	olliecrow	RUSTrust-1.94.0	Success	4,902
Apr 17, 2026 02:38	olliecrow	RUSTrust-1.94.0	Success	4,766
Apr 17, 2026 02:31	olliecrow	CPPclang++18.1.3	Success	5,315
Apr 17, 2026 02:27	olliecrow	RUSTrust-1.94.0	Success	4,791
Apr 17, 2026 02:19	olliecrow	CPPclang++18.1.3	Success	5,452
Apr 17, 2026 02:15	olliecrow	CPPclang++18.1.3	Success	5,275
Apr 17, 2026 02:15	olliecrow	RUSTrust-1.94.0	Success	4,682
Apr 17, 2026 02:11	olliecrow	RUSTrust-1.94.0	Success	5,338
Apr 17, 2026 02:04	olliecrow	RUSTrust-1.94.0	Success	4,670
Apr 17, 2026 02:00	olliecrow	CPPclang++18.1.3	Error
Apr 17, 2026 01:58	olliecrow	RUSTrust-1.94.0	Success	4,923
Apr 17, 2026 01:51	olliecrow	RUSTrust-1.94.0	Success	4,803
Apr 17, 2026 01:49	olliecrow	CPPclang++18.1.3	Success	6,484
Apr 17, 2026 01:47	olliecrow	RUSTrust-1.94.0	Success	4,829
Apr 17, 2026 01:43	olliecrow	RUSTrust-1.94.0	Success	4,973
Apr 17, 2026 01:43	olliecrow	RUSTrust-1.94.0	Success	4,871

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