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 3, 2026 23:10	Elijah Kin	CPPg++14.2.0	Success	2,883
Jun 3, 2026 22:42	Elijah Kin	CPPg++14.2.0	Success	2,889
Jun 3, 2026 22:19	Elijah Kin	CPPg++14.2.0	Success	6,313
Jun 3, 2026 20:51	Elijah Kin	CPPg++14.2.0	Success	2,861
Jun 3, 2026 20:46	Elijah Kin	CPPg++14.2.0	Success	2,956
Jun 3, 2026 20:33	Elijah Kin	CPPg++14.2.0	Success	3,024
Jun 3, 2026 20:06	Elijah Kin	CPPg++14.2.0	Success	3,165
Jun 3, 2026 19:56	Elijah Kin	CPPg++14.2.0	Success	3,146
Jun 3, 2026 18:43	Elijah Kin	CPPg++14.2.0	Success	2,984
Jun 3, 2026 18:33	Elijah Kin	CPPg++14.2.0	Success	2,778+132.31 RP
Jun 3, 2026 17:24	Elijah Kin	CPPg++14.2.0	Success	2,884+3.60 RP
Jun 3, 2026 17:12	Elijah Kin	CPPg++14.2.0	Success	3,010
Jun 3, 2026 16:47	Elijah Kin	CPPg++14.2.0	Success	2,987
Jun 3, 2026 16:40	Elijah Kin	CPPg++14.2.0	Success	2,887+503.47 RP
Jun 3, 2026 16:31	Elijah Kin	CPPg++14.2.0	Success	3,562
Jun 3, 2026 16:22	Elijah Kin	CPPg++14.2.0	Success	3,378+188.71 RP
Jun 3, 2026 16:15	Elijah Kin	CPPg++14.2.0	Success	3,676
Jun 3, 2026 15:46	Elijah Kin	CPPg++14.2.0	Success	3,865
Jun 3, 2026 15:29	Elijah Kin	CPPg++14.2.0	Success	3,608+479.09 RP
Jun 3, 2026 15:21	Elijah Kin	CPPg++14.2.0	Success	4,362+243.77 RP
Jun 3, 2026 10:02	Victor Mercklé	CPPg++14.2.0	Success	1,722+40.32 RP
Jun 3, 2026 09:04	Victor Mercklé	CPPg++14.2.0	Success	1,836
Jun 3, 2026 07:42	Elijah Kin	CPPg++14.2.0	Success	5,219
Jun 3, 2026 07:33	Elijah Kin	CPPg++14.2.0	Success	5,276
Jun 3, 2026 07:33	Victor Mercklé	CPPg++14.2.0	Success	1,728+79.82 RP
Jun 3, 2026 07:30	Elijah Kin	CPPg++14.2.0	Success	5,422
Jun 3, 2026 07:26	Elijah Kin	CPPg++14.2.0	Success	5,240
Jun 3, 2026 07:16	Elijah Kin	CPPg++14.2.0	Success	4,881+23.24 RP
Jun 3, 2026 07:01	Elijah Kin	CPPg++14.2.0	Success	10,412
Jun 3, 2026 06:46	Elijah Kin	CPPg++14.2.0	Success	10,358
Jun 3, 2026 06:31	Elijah Kin	CPPg++14.2.0	Success	6,066
Jun 3, 2026 06:08	Elijah Kin	CPPg++14.2.0	Success	7,093
Jun 3, 2026 06:01	Elijah Kin	CPPg++14.2.0	Success	10,786
Jun 3, 2026 04:40	Elijah Kin	CPPg++14.2.0	Success	8,307
Jun 3, 2026 03:22	Victor Mercklé	CPPg++14.2.0	Success	1,799
Jun 3, 2026 01:16	Victor Mercklé	CPPg++14.2.0	Success	1,744
Jun 2, 2026 23:59	Victor Mercklé	CPPg++14.2.0	Success	1,740+207.58 RP
Jun 2, 2026 22:18	Victor Mercklé	CPPg++14.2.0	Success	1,823
Jun 2, 2026 21:41	Victor Mercklé	CPPg++14.2.0	Success	1,822
Jun 2, 2026 18:21	Victor Mercklé	CPPg++14.2.0	Success	1,772+88.48 RP
Jun 2, 2026 17:45	Victor Mercklé	CPPg++14.2.0	Success	1,786+666.34 RP
Jun 2, 2026 17:31	Victor Mercklé	CPPg++14.2.0	Success	1,899+1'220.88 RP
Jun 2, 2026 17:14	Victor Mercklé	CPPg++14.2.0	Success	2,220
Jun 2, 2026 15:58	Victor Mercklé	CPPg++14.2.0	Success	2,224
Jun 2, 2026 15:18	Victor Mercklé	CPPg++14.2.0	Success	2,152
Jun 2, 2026 13:51	Victor Mercklé	CPPg++14.2.0	Success	2,231
Jun 2, 2026 13:36	Victor Mercklé	CPPg++14.2.0	Success	2,252
Jun 2, 2026 13:30	Victor Mercklé	CPPg++14.2.0	Success	2,212
Jun 2, 2026 13:25	Victor Mercklé	CPPg++14.2.0	Success	2,236
Jun 2, 2026 13:19	Victor Mercklé	CPPg++14.2.0	Success	2,238
Jun 2, 2026 13:03	Victor Mercklé	CPPg++14.2.0	Success	2,148+68.84 RP
Jun 2, 2026 12:38	Victor Mercklé	CPPg++14.2.0	Success	2,242
Jun 2, 2026 12:32	Victor Mercklé	CPPg++14.2.0	Success	2,222
Jun 2, 2026 12:23	Victor Mercklé	CPPg++14.2.0	Success	2,166
Jun 2, 2026 12:03	Victor Mercklé	CPPg++14.2.0	Success	2,230
Jun 2, 2026 11:17	Victor Mercklé	CPPg++14.2.0	Success	2,187
Jun 2, 2026 10:21	Victor Mercklé	CPPg++14.2.0	Success	2,196
Jun 2, 2026 08:52	Victor Mercklé	CPPg++14.2.0	Success	2,229
Jun 2, 2026 08:46	Victor Mercklé	CPPg++14.2.0	Success	2,169
Jun 2, 2026 08:16	Victor Mercklé	CPPg++14.2.0	Success	2,174
Jun 2, 2026 08:11	Victor Mercklé	CPPg++14.2.0	Success	2,235
Jun 2, 2026 07:57	Victor Mercklé	CPPg++14.2.0	Success	2,176
Jun 2, 2026 07:52	Victor Mercklé	CPPg++14.2.0	Success	2,164+8.54 RP
Jun 2, 2026 07:16	Victor Mercklé	CPPg++14.2.0	Error	+63.07 RP
Jun 2, 2026 07:11	Victor Mercklé	CPPg++14.2.0	Success	2,208
Jun 2, 2026 06:53	Victor Mercklé	CPPg++14.2.0	Success	2,196+90.34 RP
Jun 2, 2026 05:41	Victor Mercklé	CPPg++14.2.0	Success	2,245
Jun 2, 2026 05:19	Victor Mercklé	CPPg++14.2.0	Success	2,218+64.58 RP
Jun 2, 2026 05:14	Victor Mercklé	CPPg++14.2.0	Success	2,253
Jun 2, 2026 04:35	Victor Mercklé	CPPg++14.2.0	Success	2,234+153.60 RP
Jun 2, 2026 04:19	Victor Mercklé	CPPg++14.2.0	Success	2,273+114.62 RP
Jun 2, 2026 04:09	Victor Mercklé	CPPg++14.2.0	Success	2,310
Jun 2, 2026 03:58	Victor Mercklé	CPPg++14.2.0	Success	2,312
Jun 2, 2026 03:53	Victor Mercklé	CPPg++14.2.0	Success	2,305
Jun 2, 2026 03:47	Victor Mercklé	CPPg++14.2.0	Success	2,314
Jun 2, 2026 03:28	Victor Mercklé	CPPg++14.2.0	Success	2,303+63.64 RP
Jun 2, 2026 03:12	Victor Mercklé	CPPg++14.2.0	Success	2,329
Jun 2, 2026 03:05	Victor Mercklé	CPPg++14.2.0	Success	2,324
Jun 2, 2026 02:56	Victor Mercklé	CPPg++14.2.0	Success	2,320+40.68 RP
Jun 2, 2026 02:51	Victor Mercklé	CPPg++14.2.0	Success	2,331
Jun 2, 2026 02:36	Victor Mercklé	CPPg++14.2.0	Success	2,331+3.68 RP
Jun 2, 2026 02:31	Victor Mercklé	CPPg++14.2.0	Success	2,332+36.62 RP
Jun 2, 2026 02:26	Victor Mercklé	CPPg++14.2.0	Success	2,349
Jun 2, 2026 00:56	Victor Mercklé	CPPg++14.2.0	Success	2,390
Jun 2, 2026 00:51	Victor Mercklé	CPPg++14.2.0	Success	2,367
Jun 2, 2026 00:34	Victor Mercklé	CPPg++14.2.0	Success	2,372
Jun 2, 2026 00:27	Victor Mercklé	CPPg++14.2.0	Success	2,360
Jun 2, 2026 00:16	Victor Mercklé	CPPg++14.2.0	Success	2,367
Jun 2, 2026 00:02	Victor Mercklé	CPPg++14.2.0	Success	2,350
Jun 1, 2026 23:57	Victor Mercklé	CPPg++14.2.0	Success	2,342+319.40 RP
Jun 1, 2026 23:12	Victor Mercklé	CPPg++14.2.0	Success	2,566
Jun 1, 2026 21:22	Victor Mercklé	CPPg++14.2.0	Success	2,476
Jun 1, 2026 21:11	Victor Mercklé	CPPg++14.2.0	Success	2,433+166.30 RP
Jun 1, 2026 20:15	Victor Mercklé	CPPg++14.2.0	Success	2,677
Jun 1, 2026 18:40	Victor Mercklé	CPPg++14.2.0	Success	2,600
Jun 1, 2026 17:51	Victor Mercklé	CPPg++14.2.0	Success	2,562
Jun 1, 2026 17:39	Victor Mercklé	CPPg++14.2.0	Success	2,612
Jun 1, 2026 17:15	Victor Mercklé	CPPg++14.2.0	Success	2,584
Jun 1, 2026 17:00	Victor Mercklé	CPPg++14.2.0	Success	2,611
Jun 1, 2026 16:55	Victor Mercklé	CPPg++14.2.0	Success	2,850

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