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.

Back to listMar 19, 2026 07:37

Dominique GarmierScore: 14,246Success

Source Code

Source code access is restricted. Log in to request access.

Challenge History

No challenges yet.

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory
1	Mar 19, 2026 07:01	14,157	60,800,899	29,325,000	6,067,000	2,289,664
2	Mar 19, 2026 07:27	14,160	57,817,305	30,344,000	5,057,000	2,408,448
3	Mar 19, 2026 07:01	14,166	63,617,121	32,380,000	3,035,000	2,289,664
4	Mar 19, 2026 06:49	14,176	56,734,137	31,389,000	4,050,000	2,301,952
5	Mar 19, 2026 07:43	14,178	58,835,666	32,407,000	3,038,000	2,289,664
6	Mar 19, 2026 07:27	14,178	58,109,742	29,370,000	6,076,000	2,265,088
7	Mar 19, 2026 07:01	14,184	63,849,579	32,420,000	3,039,000	2,289,664
8	Mar 19, 2026 06:49	14,185	59,444,449	30,397,000	5,066,000	2,424,832
9	Mar 19, 2026 07:23	14,185	56,270,237	31,410,000	4,052,000	2,277,376
10	Mar 19, 2026 07:27	14,189	57,601,787	30,405,000	5,067,000	2,469,888
11	Mar 19, 2026 06:57	14,192	61,916,209	31,426,000	4,054,000	2,449,408
12	Mar 19, 2026 06:57	14,192	57,977,375	31,426,000	4,055,000	2,289,664
13	Mar 19, 2026 07:13	14,198	62,121,387	32,453,000	3,042,000	2,514,944
14	Mar 19, 2026 07:37	14,199	62,651,157	30,426,000	5,071,000	2,506,752
15	Mar 19, 2026 07:27	14,200	57,451,339	30,428,000	5,071,000	2,490,368
16	Mar 19, 2026 07:27	14,200	60,530,046	30,430,000	5,071,000	2,445,312
17	Mar 19, 2026 07:20	14,202	59,764,074	32,463,000	3,043,000	2,478,080
18	Mar 19, 2026 06:57	14,203	58,350,152	30,435,000	5,072,000	2,396,160
19	Mar 19, 2026 07:48	14,204	61,718,456	28,409,000	7,102,000	2,355,200
20	Mar 19, 2026 07:20	14,204	57,598,330	31,451,000	4,058,000	2,465,792
21	Mar 19, 2026 07:40	14,204	59,646,503	32,467,000	3,043,000	2,392,064
22	Mar 19, 2026 07:27	14,206	59,772,109	34,502,000	1,014,000	2,289,664
23	Mar 19, 2026 07:08	14,207	61,039,157	31,458,000	4,059,000	2,330,624
24	Mar 19, 2026 07:05	14,207	56,962,159	32,474,000	3,044,000	2,297,856
25	Mar 19, 2026 07:43	14,209	57,138,741	33,493,000	2,029,000	2,293,760
26	Mar 19, 2026 06:49	14,209	64,267,320	33,494,000	2,029,000	2,465,792
27	Mar 19, 2026 07:05	14,209	61,985,591	30,448,000	5,074,000	2,281,472
28	Mar 19, 2026 06:54	14,213	56,785,280	33,503,000	2,030,000	2,297,856
29	Mar 19, 2026 07:05	14,213	59,447,091	35,532,000	0	2,318,336
30	Mar 19, 2026 07:05	14,215	61,645,731	30,461,000	5,076,000	2,351,104
31	Mar 19, 2026 07:05	14,215	56,272,492	31,477,000	4,061,000	2,265,088
32	Mar 19, 2026 07:08	14,220	57,358,166	33,520,000	2,031,000	2,277,376
33	Mar 19, 2026 06:49	14,223	61,102,093	33,527,000	2,031,000	2,289,664
34	Mar 19, 2026 07:05	14,223	57,299,134	30,479,000	5,079,000	2,277,376
35	Mar 19, 2026 07:05	14,230	68,123,876	30,492,000	5,082,000	2,469,888
36	Mar 19, 2026 07:59	14,232	62,993,835	31,514,000	4,066,000	2,293,760
37	Mar 19, 2026 06:54	14,236	56,894,198	30,506,000	5,084,000	2,392,064
38	Mar 19, 2026 07:20	14,236	56,986,826	32,539,000	3,050,000	2,273,280
39	Mar 19, 2026 07:40	14,238	61,993,408	28,476,000	7,119,000	2,281,472
40	Mar 19, 2026 07:33	14,239	60,958,567	30,512,000	5,085,000	2,289,664
41	Mar 19, 2026 07:23	14,240	58,577,102	29,497,000	6,102,000	2,289,664
42	Mar 19, 2026 06:57	14,242	65,630,813	30,519,000	5,086,000	2,498,560
43	Mar 19, 2026 07:33	14,243	62,433,216	31,538,000	4,069,000	2,498,560
44	Mar 19, 2026 07:37	14,243	61,001,278	29,503,000	6,104,000	2,420,736
45	Mar 19, 2026 07:51	14,244	57,862,406	30,522,000	5,087,000	2,502,656
46	Mar 19, 2026 07:31	14,245	64,092,744	28,491,000	7,122,000	2,289,664
47	Mar 19, 2026 07:05	14,246	60,549,094	30,528,000	5,088,000	2,265,088
48	Mar 19, 2026 06:57	14,250	58,440,447	32,572,000	3,053,000	2,375,680
49	Mar 19, 2026 07:15	14,250	56,688,370	32,573,000	3,053,000	2,494,464
50	Mar 19, 2026 07:37	14,252	61,081,591	31,558,000	4,072,000	2,281,472
51	Mar 19, 2026 07:01	14,259	63,591,771	33,611,000	2,037,000	2,297,856
52	Mar 19, 2026 06:49	14,260	61,593,460	34,633,000	1,018,000	2,289,664
53	Mar 19, 2026 07:23	14,264	58,751,507	31,584,000	4,075,000	2,420,736
54	Mar 19, 2026 07:40	14,270	60,930,765	33,638,000	2,038,000	2,265,088
55	Mar 19, 2026 07:37	14,273	60,278,995	28,546,000	7,136,000	2,289,664
56	Mar 19, 2026 07:27	14,284	63,567,375	30,609,000	5,101,000	2,498,560
57	Mar 19, 2026 07:01	14,285	63,260,093	30,753,000	4,960,000	2,289,664
58	Mar 19, 2026 06:49	14,286	66,527,881	31,633,000	4,081,000	2,494,464
59	Mar 19, 2026 06:49	14,288	68,379,588	32,658,000	3,061,000	2,469,888
60	Mar 19, 2026 07:59	14,290	65,852,631	31,643,000	4,082,000	2,330,624
61	Mar 19, 2026 07:48	14,292	59,564,550	31,647,000	4,083,000	2,289,664
62	Mar 19, 2026 07:48	14,293	60,869,843	31,650,000	4,083,000	2,379,776
63	Mar 19, 2026 07:27	14,296	61,171,487	30,776,000	4,963,000	2,400,256
64	Mar 19, 2026 07:33	14,298	62,108,917	31,659,000	4,085,000	2,420,736
65	Mar 19, 2026 07:13	14,314	62,005,823	30,814,000	4,970,000	2,412,544
66	Mar 19, 2026 07:31	14,314	61,708,815	28,827,000	6,958,000	2,265,088
67	Mar 19, 2026 07:15	14,318	64,624,091	31,819,000	3,977,000	2,400,256
68	Mar 19, 2026 06:57	14,320	66,924,257	27,844,000	7,955,000	2,506,752
69	Mar 19, 2026 06:49	14,329	61,693,219	30,847,000	4,975,000	2,289,664
70	Mar 19, 2026 06:57	14,337	64,587,161	30,865,000	4,978,000	2,433,024
71	Mar 19, 2026 07:51	14,338	60,836,552	30,866,000	4,978,000	2,281,472
72	Mar 19, 2026 07:43	14,339	70,803,398	29,873,000	5,974,000	2,404,352
73	Mar 19, 2026 07:37	14,340	61,451,592	30,870,000	4,979,000	2,506,752
74	Mar 19, 2026 07:37	14,345	58,468,947	31,879,000	3,984,000	2,457,600
75	Mar 19, 2026 07:05	14,347	62,714,559	30,886,000	4,981,000	2,453,504
76	Mar 19, 2026 06:54	14,349	61,066,495	30,891,000	4,982,000	2,281,472
77	Mar 19, 2026 06:49	14,350	67,766,708	29,895,000	5,979,000	2,465,792
78	Mar 19, 2026 07:01	14,352	64,254,118	32,890,000	2,990,000	2,334,720
79	Mar 19, 2026 07:31	14,354	61,954,798	30,901,000	4,984,000	2,342,912
80	Mar 19, 2026 07:01	14,356	59,651,763	33,896,000	1,993,000	2,449,408
81	Mar 19, 2026 07:37	14,357	60,513,338	32,901,000	2,991,000	2,437,120
82	Mar 19, 2026 07:15	14,358	62,675,772	31,906,000	3,988,000	2,457,600
83	Mar 19, 2026 06:57	14,358	57,135,260	29,912,000	5,982,000	2,482,176
84	Mar 19, 2026 07:08	14,364	67,593,328	32,918,000	2,992,000	2,322,432
85	Mar 19, 2026 07:59	14,387	58,322,682	32,970,000	2,997,000	2,379,776
86	Mar 19, 2026 07:01	14,390	58,215,752	28,979,000	6,995,000	2,416,640
87	Mar 19, 2026 07:51	14,398	62,412,366	31,996,000	3,999,000	2,433,024
88	Mar 19, 2026 07:37	14,408	58,672,677	31,018,000	5,002,000	2,404,352
89	Mar 19, 2026 07:13	14,417	61,358,188	28,034,000	8,009,000	2,265,088
90	Mar 19, 2026 06:57	14,420	61,564,594	32,046,000	4,005,000	2,281,472
91	Mar 19, 2026 07:27	14,442	62,535,499	31,090,000	5,014,000	2,293,760
92	Mar 19, 2026 07:37	14,462	60,023,431	28,121,000	8,034,000	2,351,104
93	Mar 19, 2026 07:01	14,529	58,071,270	31,278,000	5,044,000	2,392,064

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