Median

Find the median of a stream of binary integers as fast as possible.

Input: 100 000 000 uint32 values in little-endian binary on STDIN (4 bytes each).

Output: The median value, printed as a decimal string. The median is defined as the element at index N/2 (i.e., a[50000000]) in the sorted array.

Restrictions:20s512Mb 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.

Back to listApr 14, 2026 03:07

Yuriy Lyfenko

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Source Code

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Challenge History

Date	Challenger	Cost	Type	Status
Jul 5, 2026 12:44	Victor Mercklé	13.84	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 5, 2026 12:45	0	33,778,017	23,219,000	1,173,000	2,117,632	expected "0 ", got "2147483648 "	stderr
2	Jul 5, 2026 12:45	0	33,918,650	23,344,000	1,178,000	2,117,632	expected "0 ", got "2147483648 "	stderr
3	Jul 5, 2026 12:45	0	33,650,043	23,124,000	1,155,000	2,117,632	expected "0 ", got "2147483648 "	stderr
4	Apr 14, 2026 03:07	3,350	55,819,886	26,451,000	1,017,000	2,375,680
5	Apr 14, 2026 03:07	3,373	51,359,013	25,611,000	2,048,000	2,387,968
6	Apr 14, 2026 03:07	3,374	54,847,838	26,645,000	1,024,000	2,453,504
7	Apr 14, 2026 03:07	3,378	53,566,022	27,697,000	0	2,473,984
8	Apr 14, 2026 03:00	3,393	54,125,175	24,840,000	2,980,000	2,490,368
9	Apr 14, 2026 03:07	3,394	53,625,428	24,852,000	2,982,000	2,494,464
10	Apr 14, 2026 03:07	3,394	58,407,518	25,841,000	1,987,000	2,514,944
11	Apr 14, 2026 03:07	3,395	54,349,058	24,859,000	2,983,000	2,400,256
12	Apr 14, 2026 03:07	3,395	53,567,823	25,847,000	1,988,000	2,502,656
13	Apr 14, 2026 03:00	3,397	58,173,154	24,869,000	2,984,000	2,326,528
14	Apr 14, 2026 03:07	3,398	56,443,093	24,878,000	2,985,000	2,514,944
15	Apr 14, 2026 03:07	3,403	55,557,535	25,910,000	1,993,000	2,502,656
16	Apr 14, 2026 03:07	3,406	55,202,675	23,938,000	3,989,000	2,453,504
17	Apr 14, 2026 03:00	3,406	55,572,334	25,937,000	1,995,000	2,514,944
18	Apr 14, 2026 03:07	3,411	50,941,058	24,972,000	2,996,000	2,367,488
19	Apr 14, 2026 03:07	3,414	53,322,619	25,998,000	1,999,000	2,473,984
20	Apr 14, 2026 03:00	3,420	54,665,539	25,042,000	3,005,000	2,265,088
21	Apr 14, 2026 03:07	3,423	58,651,684	25,059,000	3,007,000	2,326,528
22	Apr 14, 2026 03:07	3,431	54,677,611	26,129,000	2,009,000	2,506,752
23	Apr 14, 2026 03:00	3,432	52,678,527	27,136,000	1,005,000	2,293,760
24	Apr 14, 2026 03:00	3,433	55,999,359	26,143,000	2,011,000	2,355,200
25	Apr 14, 2026 03:07	3,435	54,923,148	24,140,000	4,023,000	2,465,792
26	Apr 14, 2026 03:07	3,441	54,065,631	25,193,000	3,023,000	2,469,888
27	Apr 14, 2026 03:07	3,441	56,921,265	25,196,000	3,023,000	2,490,368
28	Apr 14, 2026 03:00	3,446	54,951,851	27,249,000	1,009,000	2,416,640
29	Apr 14, 2026 03:07	3,448	59,905,048	25,241,000	3,029,000	2,445,312
30	Apr 14, 2026 03:07	3,449	54,164,337	24,242,000	4,040,000	2,306,048
31	Apr 14, 2026 03:07	3,450	58,913,535	28,286,000	0	2,310,144
32	Apr 14, 2026 03:00	3,452	54,663,849	26,284,000	2,021,000	2,416,640
33	Apr 14, 2026 03:00	3,455	53,781,910	27,323,000	1,011,000	2,342,912
34	Apr 14, 2026 03:07	3,464	56,629,464	24,349,000	4,058,000	2,482,176
35	Apr 14, 2026 03:07	3,467	55,549,695	25,384,000	3,046,000	2,379,776
36	Apr 14, 2026 03:07	3,475	51,373,808	26,458,000	2,035,000	2,490,368
37	Apr 14, 2026 03:07	3,490	62,134,050	23,505,000	5,109,000	2,301,952
38	Apr 14, 2026 03:07	3,491	56,759,655	27,606,000	1,022,000	2,273,280
39	Apr 14, 2026 03:07	3,497	58,718,561	26,629,000	2,048,000	2,310,144

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