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 17, 2026 01:40	olliecrow	RUSTrust-1.94.0	Success	4,764
Apr 17, 2026 01:39	olliecrow	RUSTrust-1.94.0	Success	5,034
Apr 17, 2026 01:37	olliecrow	RUSTrust-1.94.0	Success	4,751
Apr 17, 2026 01:34	olliecrow	RUSTrust-1.94.0	Success	5,794
Apr 17, 2026 01:33	olliecrow	RUSTrust-1.94.0	Success	5,162
Apr 17, 2026 01:28	olliecrow	RUSTrust-1.94.0	Success	4,937
Apr 17, 2026 01:28	olliecrow	RUSTrust-1.94.0	Success	4,927
Apr 17, 2026 01:25	olliecrow	RUSTrust-1.94.0	Success	4,700
Apr 17, 2026 00:11	olliecrow	ZIG0.14.0	Success	90,059
Apr 16, 2026 23:09	olliecrow	CPPclang++18.1.3	Success	5,412
Apr 16, 2026 04:22	olliecrow	CPPclang++18.1.3	Success	6,292
Apr 15, 2026 07:38	olliecrow	RUSTrust-1.94.0	Success	4,764
Apr 15, 2026 06:44	olliecrow	RUSTrust-1.94.0	Success	4,650+21.97 RP
Apr 15, 2026 05:44	olliecrow	RUSTrust-1.94.0	Success	4,698+379.09 RP
Apr 15, 2026 04:56	olliecrow	RUSTrust-1.94.0	Success	35,747
Apr 13, 2026 15:51	limanjun99	CPPg++13.3.0	Success	3,007
Apr 13, 2026 15:50	limanjun99	CPPg++13.3.0	Success	3,006
Apr 13, 2026 15:50	limanjun99	CPPg++13.3.0	Success	3,024
Apr 13, 2026 15:49	limanjun99	CPPg++13.3.0	Success	3,117
Apr 13, 2026 15:39	limanjun99	CPPg++13.3.0	Success	3,010
Apr 13, 2026 15:33	limanjun99	CPPg++13.3.0	Success	3,020
Apr 13, 2026 15:32	limanjun99	CPPg++13.3.0	Success	3,008
Apr 13, 2026 15:32	limanjun99	CPPg++13.3.0	Success	3,013
Apr 13, 2026 15:31	limanjun99	CPPg++13.3.0	Success	3,034
Apr 13, 2026 15:29	limanjun99	CPPg++13.3.0	Success	3,034
Apr 13, 2026 15:28	limanjun99	CPPg++13.3.0	Success	3,034
Apr 13, 2026 15:26	limanjun99	CPPg++13.3.0	Success	2,999+30.84 RP
Apr 13, 2026 15:25	limanjun99	CPPg++13.3.0	Success	3,027+6.54 RP
Apr 13, 2026 15:24	limanjun99	CPPg++13.3.0	Success	3,058
Apr 13, 2026 15:24	limanjun99	CPPg++13.3.0	Success	3,076
Apr 13, 2026 15:09	limanjun99	CPPg++13.3.0	Success	3,050
Apr 13, 2026 15:08	limanjun99	CPPg++13.3.0	Success	3,033+5.43 RP
Apr 13, 2026 15:04	limanjun99	CPPg++13.3.0	Success	3,048
Apr 13, 2026 14:58	limanjun99	CPPg++13.3.0	Success	3,065
Apr 13, 2026 14:56	limanjun99	CPPg++13.3.0	Success	3,166
Apr 13, 2026 14:43	limanjun99	CPPg++13.3.0	Success	3,165
Apr 13, 2026 14:41	limanjun99	CPPg++13.3.0	Success	3,038+8.65 RP
Apr 13, 2026 14:31	limanjun99	CPPg++13.3.0	Success	3,170
Apr 13, 2026 13:59	limanjun99	CPPg++13.3.0	Success	3,046+3.23 RP
Apr 13, 2026 13:52	limanjun99	CPPg++13.3.0	Success	3,167
Apr 13, 2026 13:50	limanjun99	CPPg++13.3.0	Success	3,049+60.19 RP
Apr 13, 2026 13:49	limanjun99	CPPg++13.3.0	Success	3,116
Apr 13, 2026 13:24	limanjun99	CPPg++13.3.0	Success	3,168
Apr 13, 2026 13:23	limanjun99	CPPg++13.3.0	Success	3,167
Apr 13, 2026 13:23	limanjun99	CPPg++13.3.0	Success	3,162
Apr 13, 2026 11:45	limanjun99	CPPg++13.3.0	Success	3,108
Apr 13, 2026 11:45	limanjun99	CPPg++13.3.0	Success	3,168
Apr 13, 2026 11:43	limanjun99	CPPg++13.3.0	Success	3,218
Apr 13, 2026 11:32	limanjun99	CPPg++13.3.0	Success	3,892
Apr 13, 2026 11:30	limanjun99	CPPg++13.3.0	Success	3,827
Apr 13, 2026 11:17	limanjun99	CPPg++13.3.0	Success	3,575
Apr 13, 2026 10:12	limanjun99	CPPg++13.3.0	Success	3,215
Apr 13, 2026 10:07	limanjun99	CPPg++13.3.0	Success	3,112
Apr 13, 2026 09:23	limanjun99	CPPg++13.3.0	Success	3,107
Apr 13, 2026 09:23	limanjun99	CPPg++13.3.0	Success	3,165
Apr 13, 2026 09:18	limanjun99	CPPg++13.3.0	Success	3,219
Apr 13, 2026 09:08	limanjun99	CPPg++13.3.0	Success	3,180
Apr 13, 2026 08:45	limanjun99	CPPg++13.3.0	Success	3,106+61.02 RP
Apr 13, 2026 08:43	limanjun99	CPPg++13.3.0	Success	3,166+220.84 RP
Apr 13, 2026 08:42	limanjun99	CPPg++13.3.0	Success	3,452
Apr 13, 2026 08:40	limanjun99	CPPg++13.3.0	Success	3,429
Apr 13, 2026 08:39	limanjun99	CPPg++13.3.0	Success	3,427
Apr 13, 2026 08:36	limanjun99	CPPg++13.3.0	Success	3,404+12.03 RP
Apr 13, 2026 08:22	limanjun99	CPPg++13.3.0	Success	3,474
Apr 13, 2026 08:22	limanjun99	CPPg++13.3.0	Success	3,444
Apr 13, 2026 08:21	limanjun99	CPPg++13.3.0	Success	3,442
Apr 13, 2026 08:16	limanjun99	CPPg++13.3.0	Success	3,444
Apr 13, 2026 08:12	limanjun99	CPPg++13.3.0	Success	3,418+367.49 RP
Apr 13, 2026 08:05	limanjun99	CPPg++13.3.0	Success	3,909+34.86 RP
Apr 13, 2026 07:39	limanjun99	CPPg++13.3.0	Success	4,167
Apr 13, 2026 07:38	limanjun99	CPPg++13.3.0	Success	4,367
Apr 13, 2026 05:51	limanjun99	CPPg++13.3.0	Success	4,515
Apr 13, 2026 05:27	limanjun99	CPPg++13.3.0	Success	3,963+118.34 RP
Apr 13, 2026 05:22	limanjun99	CPPg++13.3.0	Success	6,178
Apr 13, 2026 05:13	limanjun99	CPPg++13.3.0	Success	4,198
Apr 13, 2026 05:06	limanjun99	CPPg++13.3.0	Success	4,191
Apr 13, 2026 05:06	limanjun99	CPPg++13.3.0	Success	4,162
Apr 13, 2026 04:55	limanjun99	CPPg++13.3.0	Success	4,158+84.82 RP
Apr 13, 2026 04:54	limanjun99	CPPg++13.3.0	Success	4,310+1'546.31 RP
Apr 12, 2026 15:19	limanjun99	CPPg++13.3.0	Success	12,922+19.90 RP
Apr 12, 2026 15:17	limanjun99	CPPg++13.3.0	Success	13,263+403.59 RP
Apr 12, 2026 15:10	limanjun99	CPPg++13.3.0	Success	28,540+88.41 RP
Apr 12, 2026 15:00	limanjun99	CPPg++13.3.0	Success	38,171+1.72 RP
Apr 12, 2026 14:50	limanjun99	CPPg++13.3.0	Success	38,432
Apr 12, 2026 14:46	limanjun99	CPPg++13.3.0	Success	38,424+0.57 RP
Apr 12, 2026 14:45	limanjun99	CPPg++13.3.0	Success	103,717
Apr 12, 2026 14:32	limanjun99	CPPg++13.3.0	Success	38,612
Apr 12, 2026 14:25	limanjun99	CPPg++13.3.0	Success	38,509+0.20 RP
Apr 12, 2026 14:12	limanjun99	CPPg++13.3.0	Success	46,837
Apr 12, 2026 14:12	limanjun99	CPPg++13.3.0	Success	38,539+9.33 RP
Apr 12, 2026 13:49	limanjun99	CPPg++13.3.0	Success	49,124
Apr 12, 2026 13:48	limanjun99	CPPg++13.3.0	Success	41,933
Apr 12, 2026 13:48	limanjun99	CPPg++13.3.0	Success	39,977+100.97 RP
Apr 12, 2026 13:39	limanjun99	CPPg++13.3.0	Success	73,862
Apr 12, 2026 13:38	limanjun99	CPPg++13.3.0	Success	67,035+4.60 RP
Apr 12, 2026 13:38	limanjun99	CPPg++13.3.0	Success	69,168+131.32 RP
Apr 12, 2026 04:26	limanjun99	CPPg++13.3.0	Success	754,136
Apr 12, 2026 04:26	limanjun99	CPPg++13.3.0	Success	754,398+13.26 RP
Apr 9, 2026 17:51	olliecrow	ZIG0.14.0	Success	8,265+613.05 RP
Apr 9, 2026 15:47	olliecrow	RUSTrust-1.94.0	Success	5,750

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