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
Sep 19, 2026 20:03	Elijah Kin	CPPg++14.2.0	Success	2,266
Sep 19, 2026 19:27	Elijah Kin	CPPg++14.2.0	Success	2,284
Sep 19, 2026 18:58	Elijah Kin	CPPg++14.2.0	Success	2,278
Sep 19, 2026 18:46	Elijah Kin	CPPg++14.2.0	Success	2,294
Sep 19, 2026 18:35	Elijah Kin	CPPg++14.2.0	Success	2,174
Sep 19, 2026 13:33	Andrew Epstein	CPPg++14.2.0	Success	4,312
Sep 19, 2026 13:28	Andrew Epstein	CPPg++14.2.0	Success	4,858
Sep 17, 2026 20:12	Andrew Epstein	ZIG0.15.1	Success	1,402
Sep 17, 2026 20:12	Andrew Epstein	RUSTrust-1.95.0	Success	1,425
Sep 17, 2026 20:12	Andrew Epstein	CPPg++14.2.0	Success	1,394
Sep 17, 2026 20:05	Andrew Epstein	CSHARP10.0.8	Success	1,529+340.59 RP
Sep 17, 2026 20:04	Andrew Epstein	GOgo1.26.2	Success	1,299+1'357.27 RP
Sep 16, 2026 00:17	Josu San Martin	CPPclang++18.1.3	Success	2,804
Sep 15, 2026 22:34	Josu San Martin	CPPclang++18.1.3	Success	2,766
Sep 15, 2026 21:37	Josu San Martin	CPPclang++18.1.3	Success	2,813
Sep 15, 2026 21:03	Josu San Martin	CPPclang++18.1.3	Success	2,759
Sep 15, 2026 20:48	Josu San Martin	CPPclang++18.1.3	Success	2,775
Sep 15, 2026 20:31	Josu San Martin	CPPclang++18.1.3	Success	2,795
Sep 15, 2026 20:20	Josu San Martin	CPPclang++18.1.3	Success	2,811
Sep 15, 2026 19:43	Josu San Martin	CPPclang++18.1.3	Success	2,752
Sep 15, 2026 18:15	Josu San Martin	CPPclang++18.1.3	Success	2,790
Sep 15, 2026 17:59	Josu San Martin	CPPclang++18.1.3	Success	2,839
Sep 15, 2026 17:30	Josu San Martin	CPPclang++20.1.2	Success	2,861
Sep 15, 2026 17:28	Josu San Martin	CPPclang++18.1.3	Success	2,748+68.86 RP
Sep 15, 2026 17:20	Josu San Martin	CPPclang++18.1.3	Success	2,801+2.55 RP
Sep 15, 2026 16:58	Josu San Martin	CPPclang++18.1.3	Success	2,803+177.78 RP
Sep 15, 2026 11:06	Victor Mercklé	CPPg++14.2.0	Success	1,401
Sep 15, 2026 10:51	Victor Mercklé	CPPg++14.2.0	Success	1,470
Sep 15, 2026 10:36	Victor Mercklé	CPPg++14.2.0	Success	1,406
Sep 15, 2026 10:21	Victor Mercklé	CPPg++14.2.0	Success	1,403
Sep 15, 2026 10:12	Victor Mercklé	CPPg++14.2.0	Success	1,381
Sep 15, 2026 10:09	Victor Mercklé	CPPg++14.2.0	Success	1,391
Sep 15, 2026 10:05	Victor Mercklé	CPPg++14.2.0	Success	1,464
Sep 15, 2026 09:48	Victor Mercklé	CPPg++14.2.0	Success	1,460
Sep 15, 2026 09:35	Victor Mercklé	CPPg++14.2.0	Success	1,484
Sep 15, 2026 09:26	Victor Mercklé	CPPg++14.2.0	Success	1,524
Sep 15, 2026 09:15	Victor Mercklé	CPPg++14.2.0	Success	1,451
Sep 15, 2026 09:02	Victor Mercklé	CPPg++14.2.0	Success	1,426
Sep 15, 2026 08:47	Victor Mercklé	CPPg++14.2.0	Success	1,379
Sep 15, 2026 08:38	Victor Mercklé	CPPg++14.2.0	Success	1,470
Sep 15, 2026 08:17	Victor Mercklé	CPPg++14.2.0	Success	1,513
Sep 15, 2026 08:05	Victor Mercklé	CPPg++14.2.0	Success	1,470
Sep 15, 2026 07:47	Victor Mercklé	CPPg++14.2.0	Success	1,400
Sep 15, 2026 07:23	Victor Mercklé	CPPg++14.2.0	Success	1,384
Sep 15, 2026 05:54	Victor Mercklé	CPPg++14.2.0	Success	1,485
Sep 15, 2026 05:47	Victor Mercklé	CPPg++14.2.0	Success	1,500
Sep 15, 2026 05:42	Victor Mercklé	CPPg++14.2.0	Success	1,397
Sep 15, 2026 05:29	Victor Mercklé	CPPg++14.2.0	Success	1,473
Sep 15, 2026 05:26	Victor Mercklé	CPPg++14.2.0	Success	1,411
Sep 15, 2026 04:59	Victor Mercklé	CPPg++14.2.0	Success	1,470
Sep 15, 2026 03:45	Victor Mercklé	CPPg++14.2.0	Success	1,464
Sep 15, 2026 03:08	Victor Mercklé	CPPg++14.2.0	Success	1,684
Sep 15, 2026 02:30	Victor Mercklé	CPPg++14.2.0	Success	1,413
Sep 15, 2026 01:42	Victor Mercklé	CPPg++14.2.0	Success	1,375
Sep 15, 2026 01:18	Victor Mercklé	CPPg++14.2.0	Success	1,454
Sep 15, 2026 00:57	Victor Mercklé	CPPg++14.2.0	Success	1,444
Sep 15, 2026 00:40	Victor Mercklé	CPPg++14.2.0	Success	1,456
Sep 15, 2026 00:36	Victor Mercklé	CPPg++14.2.0	Success	1,478
Sep 15, 2026 00:28	Victor Mercklé	CPPg++14.2.0	Success	1,465
Sep 15, 2026 00:26	Victor Mercklé	CPPg++14.2.0	Success	1,476
Sep 15, 2026 00:10	Victor Mercklé	CPPg++14.2.0	Success	1,391
Sep 15, 2026 00:02	Victor Mercklé	CPPg++14.2.0	Success	1,483
Sep 14, 2026 23:46	Victor Mercklé	CPPg++14.2.0	Success	1,458
Sep 14, 2026 22:54	Victor Mercklé	CPPg++14.2.0	Success	1,464
Sep 14, 2026 22:24	Victor Mercklé	CPPg++14.2.0	Success	1,470
Sep 14, 2026 22:07	Victor Mercklé	CPPg++14.2.0	Success	1,438
Sep 14, 2026 21:32	Victor Mercklé	CPPg++14.2.0	Success	1,437
Sep 14, 2026 21:00	Victor Mercklé	CPPg++14.2.0	Success	1,374+322.90 RP
Sep 14, 2026 19:36	Victor Mercklé	CPPg++14.2.0	Success	1,438
Sep 14, 2026 19:20	Victor Mercklé	CPPg++14.2.0	Success	1,503
Sep 14, 2026 18:53	Victor Mercklé	CPPg++14.2.0	Success	1,437
Sep 14, 2026 18:25	Victor Mercklé	CPPg++14.2.0	Success	1,465
Sep 14, 2026 17:37	Victor Mercklé	CPPg++14.2.0	Success	1,448
Sep 14, 2026 17:16	Victor Mercklé	CPPg++14.2.0	Success	1,447
Sep 14, 2026 16:24	Victor Mercklé	CPPg++14.2.0	Success	1,723
Sep 14, 2026 15:59	Victor Mercklé	CPPg++14.2.0	Success	1,439
Sep 14, 2026 15:33	Victor Mercklé	CPPg++14.2.0	Success	1,490
Sep 14, 2026 15:25	Victor Mercklé	CPPg++14.2.0	Success	1,456
Sep 14, 2026 15:10	Victor Mercklé	CPPg++14.2.0	Success	1,495
Sep 14, 2026 14:37	Victor Mercklé	CPPg++14.2.0	Success	1,440
Sep 14, 2026 14:21	Victor Mercklé	CPPg++14.2.0	Success	1,459
Sep 14, 2026 14:16	Victor Mercklé	CPPg++14.2.0	Success	1,458
Sep 14, 2026 14:03	Victor Mercklé	CPPg++14.2.0	Success	1,494
Sep 14, 2026 13:59	Victor Mercklé	CPPg++14.2.0	Success	1,427+48.77 RP
Sep 14, 2026 13:29	Victor Mercklé	CPPg++14.2.0	Success	1,472
Sep 14, 2026 13:22	Victor Mercklé	CPPg++14.2.0	Success	1,490
Sep 14, 2026 13:19	Victor Mercklé	CPPg++14.2.0	Success	1,437+9.67 RP
Sep 14, 2026 13:13	Victor Mercklé	CPPg++14.2.0	Success	1,514
Sep 14, 2026 12:51	Victor Mercklé	CPPg++14.2.0	Success	1,474
Sep 14, 2026 11:29	Victor Mercklé	CPPg++14.2.0	Success	1,439+24.06 RP
Sep 14, 2026 11:14	Victor Mercklé	CPPg++14.2.0	Success	1,444+47.63 RP
Sep 14, 2026 10:59	Victor Mercklé	CPPg++14.2.0	Success	1,454+14.16 RP
Sep 14, 2026 10:46	Victor Mercklé	CPPg++14.2.0	Success	1,572
Sep 14, 2026 10:41	Victor Mercklé	CPPg++14.2.0	Success	1,562
Sep 14, 2026 10:22	Victor Mercklé	CPPg++14.2.0	Success	1,465
Sep 14, 2026 10:06	Victor Mercklé	CPPg++14.2.0	Success	1,545
Sep 14, 2026 09:52	Victor Mercklé	CPPg++14.2.0	Success	1,466
Sep 14, 2026 09:30	Victor Mercklé	CPPg++14.2.0	Success	1,509
Sep 14, 2026 09:03	Victor Mercklé	CPPg++14.2.0	Success	1,539
Sep 14, 2026 01:00	Andrew Epstein	ZIG0.15.1	Success	1,391

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