Large matrix multiplication

Multiply two square matrices as fast as possible.

Input

Two 2000 x 2000 matrices of uint32 values on STDIN, encoded back-to-back in row-major order, little-endian byte order.

Output

Write the resulting 2000 x 2000 product matrix to STDOUT in the same binary format (row-major, little-endian uint32).

Restrictions:60s256Mb 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 13:28	Andrew Epstein	CPPg++14.2.0	Success	3,485
Sep 19, 2026 13:23	Andrew Epstein	CPPg++14.2.0	Success	4,109
Sep 15, 2026 23:44	Josu San Martin	CPPg++13.3.0	Success	3,211
Sep 15, 2026 16:40	Haha Expert	CPPg++14.2.0	Success	4,246+6.64 RP
Sep 15, 2026 16:36	Haha Expert	CPPg++14.2.0	Success	4,656
Sep 15, 2026 16:26	Haha Expert	CPPg++14.2.0	Success	4,258+77.86 RP
Sep 15, 2026 16:10	Haha Expert	CPPg++14.2.0	Success	4,404+120.13 RP
Sep 15, 2026 16:03	Haha Expert	CPPg++13.3.0	Success	5,190
Sep 15, 2026 16:02	Haha Expert	CPPclang++20.1.2	Success	5,446
Sep 15, 2026 15:59	Haha Expert	CPPg++14.2.0	Success	4,668
Sep 15, 2026 15:52	Haha Expert	CPPg++14.2.0	Success	5,058
Sep 15, 2026 15:47	Haha Expert	CPPg++14.2.0	Error
Sep 15, 2026 15:41	Haha Expert	CPPg++14.2.0	Success	4,650+279.98 RP
Sep 15, 2026 15:34	Haha Expert	CPPg++14.2.0	Success	5,346+1'085.13 RP
Sep 15, 2026 15:25	Haha Expert	CPPg++14.2.0	Success	12,732+599.78 RP
Sep 14, 2026 09:39	Haha Expert	CPPg++14.2.0	Success	53,868+0.36 RP
Sep 10, 2026 03:20	Andrew Epstein	CPPg++14.2.0	Success	3,294+106.71 RP
Sep 10, 2026 03:13	Andrew Epstein	CPPg++14.2.0	Success	3,414+622.31 RP
Sep 4, 2026 09:22	Victor Mercklé	CPPg++14.2.0	Success	1,585
Sep 4, 2026 08:19	Victor Mercklé	CPPg++14.2.0	Success	1,587
Sep 4, 2026 07:18	Victor Mercklé	CPPg++14.2.0	Success	1,583+5.00 RP
Sep 4, 2026 05:55	Haha Expert	CPPclang++20.1.2	Success	381,343+5.00 RP
Aug 31, 2026 11:27	Tomislav Tunkovic	CPPg++14.2.0	Success	1,720
Aug 30, 2026 23:13	Victor Mercklé	CPPg++14.2.0	Success	1,621
Aug 30, 2026 22:54	Victor Mercklé	CPPg++14.2.0	Success	1,581+8.00 RP
Aug 30, 2026 22:42	Victor Mercklé	CPPg++14.2.0	Success	1,598
Aug 30, 2026 22:20	Victor Mercklé	CPPg++14.2.0	Success	1,582
Aug 30, 2026 20:57	Victor Mercklé	CPPg++14.2.0	Success	1,582+23.92 RP
Aug 30, 2026 20:51	Victor Mercklé	CPPg++14.2.0	Success	1,585+31.76 RP
Aug 30, 2026 20:20	Victor Mercklé	CPPg++14.2.0	Success	1,589+129.36 RP
Aug 30, 2026 20:14	Victor Mercklé	CPPg++14.2.0	Success	1,606+3.87 RP
Aug 30, 2026 20:08	Victor Mercklé	CPPg++14.2.0	Success	1,610
Aug 30, 2026 19:22	Victor Mercklé	GOgo1.26.2	Success	1,610+121.05 RP
Aug 30, 2026 19:21	Victor Mercklé	ZIG0.16.0	Success	1,606+106.70 RP
Aug 30, 2026 19:19	Victor Mercklé	RUSTrust-1.95.0	Success	1,605+107.07 RP
Aug 30, 2026 19:13	Victor Mercklé	CSHARP10.0.7	Success	1,611+102.32 RP
Aug 27, 2026 14:58	Victor Mercklé	CPPg++14.2.0	Success	1,607+15.46 RP
Aug 27, 2026 14:48	Victor Mercklé	CPPg++14.2.0	Success	2,301
Aug 27, 2026 14:27	Victor Mercklé	CPPg++14.2.0	Success	1,879
Aug 27, 2026 13:57	Victor Mercklé	CPPg++14.2.0	Success	1,609+7.72 RP
Aug 27, 2026 13:47	Victor Mercklé	CPPg++14.2.0	Success	1,610+61.42 RP
Aug 27, 2026 12:59	Victor Mercklé	CPPg++14.2.0	Success	1,986
Aug 27, 2026 12:48	Victor Mercklé	CPPg++14.2.0	Success	1,619
Aug 27, 2026 12:41	Victor Mercklé	CPPg++14.2.0	Success	3,994
Aug 27, 2026 12:35	Victor Mercklé	CPPg++14.2.0	Success	1,621
Aug 27, 2026 12:24	Victor Mercklé	CPPg++14.2.0	Success	1,647
Aug 27, 2026 12:18	Victor Mercklé	CPPg++14.2.0	Success	1,624
Aug 27, 2026 11:12	Victor Mercklé	CPPg++14.2.0	Success	1,645
Aug 27, 2026 10:58	Victor Mercklé	CPPg++14.2.0	Success	1,618+38.08 RP
Aug 27, 2026 10:49	Victor Mercklé	CPPg++14.2.0	Success	1,628
Aug 27, 2026 10:25	Victor Mercklé	CPPg++14.2.0	Success	1,624
Aug 27, 2026 08:58	Victor Mercklé	CPPg++14.2.0	Success	1,623+15.16 RP
Aug 25, 2026 16:44	Navneet Raj	CPPg++10.5.0	Success	3,163
Aug 25, 2026 13:26	Navneet Raj	CPPg++10.5.0	Success	3,133
Aug 25, 2026 13:22	Navneet Raj	CPPg++10.5.0	Success	3,092+165.73 RP
Aug 25, 2026 13:19	Navneet Raj	CPPg++10.5.0	Success	3,908
Aug 25, 2026 13:02	Navneet Raj	CPPg++10.5.0	Error
Aug 25, 2026 12:47	Navneet Raj	CPPg++10.5.0	Success	3,259+194.86 RP
Aug 25, 2026 12:28	Navneet Raj	CPPg++10.5.0	Success	3,480+270.07 RP
Aug 24, 2026 17:20	Navneet Raj	CPPg++10.5.0	Error
Aug 24, 2026 17:16	Navneet Raj	CPPg++10.5.0	Error
Aug 24, 2026 17:14	Navneet Raj	CPPg++10.5.0	Error
Aug 24, 2026 16:24	Navneet Raj	CPPg++10.5.0	Success	3,965
Aug 24, 2026 16:11	Navneet Raj	CPPg++10.5.0	Success	3,841
Aug 24, 2026 15:39	Navneet Raj	CPPg++10.5.0	Success	3,841+69.28 RP
Aug 24, 2026 15:22	Navneet Raj	CPPg++10.5.0	Success	4,063
Aug 24, 2026 15:14	Navneet Raj	CPPg++10.5.0	Success	4,083
Aug 24, 2026 15:12	Navneet Raj	CPPg++10.5.0	Error
Aug 24, 2026 14:58	Navneet Raj	CPPg++10.5.0	Success	3,959
Aug 24, 2026 14:57	Navneet Raj	CPPg++10.5.0	Success	3,946+44.79 RP
Aug 24, 2026 14:41	Navneet Raj	CPPg++10.5.0	Success	4,104
Aug 24, 2026 14:12	Navneet Raj	CPPg++10.5.0	Success	4,035
Aug 24, 2026 14:10	Navneet Raj	CPPg++10.5.0	Success	4,020
Aug 24, 2026 14:08	Navneet Raj	CPPg++14.2.0	Success	4,128
Aug 24, 2026 14:06	Navneet Raj	CPPg++10.5.0	Success	4,017+1'619.48 RP
Aug 23, 2026 17:25	Navneet Raj	CPPg++10.5.0	Success	14,954
Aug 23, 2026 17:19	Navneet Raj	CPPg++14.2.0	Success	21,910
Aug 23, 2026 17:13	Navneet Raj	CPPg++14.2.0	Success	21,875
Aug 23, 2026 17:11	Navneet Raj	CPPg++10.5.0	Success	14,800
Aug 23, 2026 16:38	Navneet Raj	CPPg++14.2.0	Success	11,505
Aug 23, 2026 16:32	Navneet Raj	CPPg++14.2.0	Success	12,553
Aug 23, 2026 16:29	Navneet Raj	CPPg++14.2.0	Success	11,495+73.83 RP
Aug 23, 2026 16:24	Navneet Raj	CPPg++10.5.0	Error
Aug 23, 2026 16:12	Navneet Raj	CPPg++10.5.0	Success	12,561+615.80 RP
Aug 23, 2026 15:43	Navneet Raj	CPPg++10.5.0	Success	59,243
Aug 23, 2026 15:20	Andrew Epstein	CPPg++14.2.0	Success	4,335+2'284.91 RP
Aug 23, 2026 15:05	Cyrus Knopf	CPPclang++20.1.2	Success	12,371+813.34 RP
Aug 23, 2026 13:39	Navneet Raj	CPPg++10.5.0	Success	55,460+185.31 RP
Aug 19, 2026 17:44	Victor Mercklé	CPPg++14.2.0	Success	1,625+52.72 RP
Aug 19, 2026 16:56	Victor Mercklé	CPPg++14.2.0	Success	1,796
Aug 19, 2026 16:33	Victor Mercklé	CPPg++14.2.0	Success	1,659
Aug 19, 2026 15:35	Victor Mercklé	CPPg++14.2.0	Success	1,636+3.73 RP
Aug 19, 2026 15:18	Victor Mercklé	CPPg++14.2.0	Success	1,639
Aug 19, 2026 15:15	Victor Mercklé	CPPg++14.2.0	Success	1,637
Aug 19, 2026 15:12	Victor Mercklé	CPPg++14.2.0	Success	1,642
Aug 19, 2026 15:02	Victor Mercklé	CPPg++14.2.0	Success	1,637+3.73 RP
Aug 17, 2026 18:42	Tomislav Tunkovic	CSHARP9.0.15	Error
Aug 17, 2026 18:17	Tomislav Tunkovic	CSHARP9.0.15	Error
Aug 17, 2026 18:15	Tomislav Tunkovic	GOgo1.26.2	Success	1,642+25.85 RP
Aug 17, 2026 17:57	Tomislav Tunkovic	CSHARP9.0.15	Error

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