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 listJan 2, 2026 06:01

Rajarshi Basu

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Source Code

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Challenge History

Date	Challenger	Cost	Type	Status
Oct 5, 2026 21:24	Andrew Epstein	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Oct 5, 2026 21:25	0	17,295,894	3,179,000	3,483,000	20,480	No answer to stdout. Died or killed?
2	Jan 2, 2026 06:04	5,299	72,331,808	40,417,000	3,031,000	2,506,752
3	Jan 2, 2026 06:06	5,313	71,810,350	39,513,000	4,052,000	2,359,296
4	Jan 2, 2026 06:01	5,457	71,111,714	40,772,000	3,977,000	2,293,760
5	Jan 2, 2026 06:06	5,504	73,803,290	40,115,000	5,014,000	2,322,432
6	Jan 2, 2026 06:02	5,853	69,961,970	45,992,000	1,999,000	2,478,080
7	Jan 2, 2026 06:04	5,913	75,483,072	46,470,000	2,020,000	2,461,696
8	Jan 2, 2026 06:02	5,915	76,516,615	40,418,000	8,083,000	2,490,368
9	Jan 2, 2026 06:06	5,961	74,001,531	43,890,000	4,987,000	2,514,944
10	Jan 2, 2026 06:06	6,073	76,370,175	43,825,000	5,976,000	2,510,848
11	Jan 2, 2026 06:01	6,114	76,162,624	46,127,000	4,011,000	2,404,352
12	Jan 2, 2026 06:02	6,171	75,912,938	44,531,000	6,072,000	2,351,104
13	Jan 2, 2026 06:06	6,194	78,384,859	44,816,000	5,975,000	2,297,856
14	Jan 2, 2026 06:04	6,196	76,423,911	44,831,000	5,977,000	2,531,328
15	Jan 2, 2026 06:06	6,321	78,974,692	48,841,000	2,990,000	2,412,544
16	Jan 2, 2026 06:06	6,342	78,409,603	43,004,000	9,000,000	2,428,928
17	Jan 2, 2026 06:04	6,426	77,175,566	44,740,000	7,953,000	2,428,928
18	Jan 2, 2026 06:05	6,443	84,716,914	47,848,000	4,984,000	2,301,952
19	Jan 2, 2026 06:06	6,537	77,450,789	50,569,000	3,034,000	2,510,848
20	Jan 2, 2026 06:01	6,584	81,872,519	48,988,000	4,998,000	2,314,240
21	Jan 2, 2026 06:02	6,889	88,494,188	52,452,000	4,034,000	2,281,472
22	Jan 2, 2026 06:02	85,641	727,615,686	593,373,000	108,884,000	2,510,848
23	Jan 2, 2026 06:02	86,260	738,257,769	599,438,000	107,898,000	2,281,472
24	Jan 2, 2026 06:01	88,302	754,271,504	594,243,000	129,834,000	2,379,776
25	Jan 2, 2026 06:06	88,622	756,056,261	624,741,000	101,957,000	2,469,888
26	Jan 2, 2026 06:05	95,020	807,452,291	654,295,000	124,865,000	2,514,944
27	Jan 2, 2026 06:04	96,384	817,256,405	675,444,000	114,905,000	2,371,584
28	Jan 2, 2026 06:02	97,450	829,276,944	683,225,000	115,868,000	2,527,232
29	Jan 2, 2026 06:04	97,958	833,335,779	682,370,000	120,888,000	2,428,928
30	Jan 2, 2026 06:05	98,352	840,735,285	671,570,000	134,913,000	2,412,544
31	Jan 2, 2026 06:02	99,279	839,746,262	701,217,000	112,874,000	2,510,848
32	Jan 2, 2026 06:04	100,505	850,808,963	710,261,000	113,881,000	2,371,584
33	Jan 2, 2026 06:04	100,709	852,732,936	703,840,000	121,972,000	2,408,448
34	Jan 2, 2026 06:01	105,538	889,763,055	757,483,000	107,926,000	2,318,336
35	Jan 2, 2026 06:01	105,730	893,000,080	734,986,000	131,997,000	2,437,120
36	Jan 2, 2026 06:04	108,675	927,734,548	773,249,000	117,885,000	2,465,792
37	Jan 2, 2026 06:01	110,610	936,700,495	793,124,000	113,874,000	2,416,640
38	Jan 2, 2026 06:01	111,003	937,444,522	780,337,000	129,889,000	2,387,968
39	Jan 2, 2026 06:01	114,322	966,497,646	822,511,000	114,931,000	2,392,064
40	Jan 2, 2026 06:02	115,444	975,028,295	834,802,000	111,839,000	2,318,336

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