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
Nov 9, 2026 01:54	highload-churner	CPPg++14.2.0	Success	1,218
Nov 9, 2026 01:33	highload-churner	CPPg++14.2.0	Success	1,246
Nov 9, 2026 01:13	highload-churner	CPPg++14.2.0	Success	1,272
Nov 9, 2026 00:51	highload-churner	CPPg++14.2.0	Success	1,263
Nov 8, 2026 12:54	highload-churner	CPPg++14.2.0	Success	1,270
Nov 8, 2026 12:03	highload-churner	CPPg++14.2.0	Success	1,291
Nov 8, 2026 11:17	highload-churner	CPPg++14.2.0	Success	1,287
Nov 8, 2026 10:31	highload-churner	CPPg++14.2.0	Success	1,292
Nov 8, 2026 10:00	highload-churner	CPPg++14.2.0	Success	1,243
Nov 8, 2026 09:53	highload-churner	CPPg++14.2.0	Success	1,261
Nov 8, 2026 09:46	highload-churner	CPPg++14.2.0	Success	1,296
Nov 8, 2026 09:40	highload-churner	CPPg++14.2.0	Success	1,287
Nov 8, 2026 09:33	highload-churner	CPPg++14.2.0	Success	1,302
Nov 8, 2026 09:32	highload-churner	CPPg++14.2.0	Success	1,232
Nov 8, 2026 09:24	highload-churner	CPPg++14.2.0	Success	1,262
Nov 8, 2026 09:15	highload-churner	CPPg++14.2.0	Success	1,215
Nov 8, 2026 09:06	highload-churner	CPPg++14.2.0	Success	1,246
Nov 8, 2026 08:58	highload-churner	CPPg++14.2.0	Success	1,266
Nov 8, 2026 08:56	highload-churner	CPPg++14.2.0	Success	1,244
Nov 8, 2026 08:56	highload-churner	CPPg++14.2.0	Success	1,321
Nov 8, 2026 08:48	highload-churner	CPPg++14.2.0	Success	1,260
Nov 8, 2026 08:47	highload-churner	CPPg++14.2.0	Success	1,286
Nov 8, 2026 08:40	highload-churner	CPPg++14.2.0	Success	1,250
Nov 8, 2026 08:39	highload-churner	CPPg++14.2.0	Success	1,289
Nov 8, 2026 08:32	highload-churner	CPPg++14.2.0	Success	1,240
Nov 8, 2026 08:31	highload-churner	CPPg++14.2.0	Success	1,330
Nov 8, 2026 08:24	highload-churner	CPPg++14.2.0	Success	1,236
Nov 8, 2026 08:23	highload-churner	CPPg++14.2.0	Success	1,338
Nov 8, 2026 08:22	highload-churner	CPPg++14.2.0	Success	1,283
Nov 8, 2026 08:16	highload-churner	CPPg++14.2.0	Success	1,293
Nov 8, 2026 08:11	highload-churner	CPPg++14.2.0	Success	1,260
Nov 8, 2026 08:05	highload-churner	CPPg++14.2.0	Success	1,311
Nov 8, 2026 07:59	highload-churner	CPPg++14.2.0	Success	1,224
Nov 8, 2026 07:54	highload-churner	CPPg++14.2.0	Success	1,239
Nov 8, 2026 07:48	highload-churner	CPPg++14.2.0	Success	1,274
Nov 8, 2026 07:42	highload-churner	CPPg++14.2.0	Success	1,312
Nov 8, 2026 07:35	highload-churner	CPPg++14.2.0	Success	1,219
Nov 8, 2026 07:28	highload-churner	CPPg++14.2.0	Success	1,287
Nov 8, 2026 07:21	highload-churner	CPPg++14.2.0	Success	1,338
Nov 8, 2026 07:18	highload-churner	CPPg++14.2.0	Success	1,344
Nov 8, 2026 07:04	highload-churner	CPPg++14.2.0	Success	1,294
Nov 8, 2026 07:01	highload-churner	CPPg++14.2.0	Success	1,319
Nov 8, 2026 06:58	highload-churner	CPPg++14.2.0	Success	1,343
Nov 8, 2026 06:55	highload-churner	CPPg++14.2.0	Success	1,205
Nov 8, 2026 06:42	highload-churner	CPPg++14.2.0	Success	1,222
Nov 8, 2026 06:41	highload-churner	CPPg++14.2.0	Success	1,339
Nov 8, 2026 06:40	highload-churner	CPPg++14.2.0	Success	1,304
Nov 8, 2026 06:37	highload-churner	CPPg++14.2.0	Success	1,342
Nov 8, 2026 06:34	highload-churner	CPPg++14.2.0	Success	1,274
Nov 8, 2026 06:31	highload-churner	CPPg++14.2.0	Success	1,195
Nov 8, 2026 06:29	highload-churner	CPPg++14.2.0	Success	1,349
Nov 8, 2026 06:24	highload-churner	CPPg++14.2.0	Success	1,306
Nov 8, 2026 06:23	highload-churner	CPPg++14.2.0	Success	1,336
Nov 8, 2026 06:19	highload-churner	CPPg++14.2.0	Success	1,338
Nov 8, 2026 06:16	highload-churner	CPPg++14.2.0	Success	1,338
Nov 8, 2026 05:41	highload-churner	CPPg++14.2.0	Success	1,394
Nov 8, 2026 05:09	highload-churner	CPPg++14.2.0	Error
Nov 8, 2026 05:07	highload-churner	CPPg++14.2.0	Error
Nov 6, 2026 14:24	Andrew Epstein	ZIG0.15.1	Success	1,259
Nov 6, 2026 14:23	Andrew Epstein	GOgo1.26.2	Success	1,259+62.59 RP
Nov 3, 2026 00:46	Andrew Epstein	CSHARP10.0.8	Success	1,263
Nov 3, 2026 00:41	Andrew Epstein	CSHARP10.0.8	Success	1,227+226.03 RP
Nov 3, 2026 00:29	Andrew Epstein	CSHARP10.0.8	Success	1,268
Nov 3, 2026 00:24	Andrew Epstein	CSHARP9.0.18	Success	1,270
Nov 3, 2026 00:17	Andrew Epstein	RUSTrust-1.95.0	Success	1,226
Nov 3, 2026 00:12	Andrew Epstein	RUSTrust-1.95.0	Success	1,165+587.13 RP
Nov 3, 2026 00:09	Andrew Epstein	CSHARP10.0.8	Success	1,262
Nov 2, 2026 23:57	Andrew Epstein	RUSTrust-1.95.0	Success	1,242
Nov 2, 2026 23:57	Andrew Epstein	GOgo1.26.2	Success	1,269+79.91 RP
Nov 2, 2026 23:51	Andrew Epstein	CSHARP10.0.8	Success	1,300
Nov 2, 2026 23:43	Andrew Epstein	RUSTrust-1.95.0	Success	1,252
Nov 2, 2026 23:43	Andrew Epstein	GOgo1.26.2	Success	1,303
Nov 2, 2026 23:43	Andrew Epstein	CPPg++14.2.0	Success	8,091
Nov 2, 2026 23:43	Andrew Epstein	CSHARP10.0.8	Success	1,374
Nov 2, 2026 23:27	Andrew Epstein	ZIG0.15.1	Success	1,224+124.88 RP
Nov 2, 2026 23:26	Andrew Epstein	RUSTrust-1.95.0	Success	1,256
Nov 2, 2026 23:26	Andrew Epstein	GOgo1.26.2	Success	1,304
Nov 2, 2026 22:13	Andrew Epstein	CPPg++14.2.0	Success	1,177+897.82 RP
Nov 2, 2026 22:13	Andrew Epstein	GOgo1.26.2	Success	1,300
Nov 2, 2026 22:13	Andrew Epstein	GOgo1.26.2	Success	1,325
Nov 2, 2026 22:03	Andrew Epstein	GOgo1.26.2	Success	1,303
Nov 2, 2026 21:50	Andrew Epstein	CPPg++14.2.0	Success	8,926
Nov 2, 2026 21:50	Andrew Epstein	CPPclang++20.1.2	Success	8,790
Nov 2, 2026 21:44	Andrew Epstein	CPPg++14.2.0	Success	9,158
Nov 2, 2026 21:41	Andrew Epstein	CPPg++14.2.0	Success	1,389
Nov 2, 2026 21:41	Andrew Epstein	CPPclang++20.1.2	Success	16,399
Nov 2, 2026 21:41	Andrew Epstein	CPPg++14.2.0	Success	16,264
Nov 2, 2026 21:37	Andrew Epstein	CPPg++14.2.0	Success	44,613
Nov 2, 2026 21:34	Andrew Epstein	CPPclang++20.1.2	Success	12,700
Nov 2, 2026 21:34	Andrew Epstein	CPPg++14.2.0	Success	12,762
Nov 2, 2026 21:28	Andrew Epstein	CPPg++14.2.0	Success	1,387
Nov 2, 2026 21:22	Andrew Epstein	CPPclang++20.1.2	Success	24,182
Nov 2, 2026 21:22	Andrew Epstein	CPPg++14.2.0	Success	24,501
Nov 2, 2026 21:20	Andrew Epstein	CPPclang++20.1.2	Success	12,775
Nov 2, 2026 21:20	Andrew Epstein	CPPg++14.2.0	Success	12,735
Nov 2, 2026 21:13	Andrew Epstein	CPPg++14.2.0	Success	24,444
Nov 2, 2026 21:13	Andrew Epstein	CPPclang++20.1.2	Success	24,175
Oct 20, 2026 00:30	highload-churner	CPPg++14.2.0	Success	1,393
Oct 20, 2026 00:27	highload-churner	CPPg++14.2.0	Success	1,409
Oct 20, 2026 00:26	highload-churner	CPPg++14.2.0	Success	1,219

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