Count uint8

Count the number of bytes equal to 127 in a binary stream as fast as possible.

Input: 250 000 000 uint8 values in binary on STDIN.

Output: The count of elements equal to 127, printed as a decimal string.

Restrictions:30s512Mb 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 25, 2025 20:58

vahook

Error

Source Code

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

Challenge History

Date	Challenger	Cost	Type	Status
Jul 4, 2026 06:37	Victor Mercklé	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	Jul 4, 2026 06:37	0	20,597,981	12,735,000	0	2,113,536	expected "25000000 ", got "24967232 "
2	Jul 4, 2026 06:37	0	20,606,551	12,766,000	0	2,113,536	expected "25000000 ", got "24967232 "
3	Jul 4, 2026 06:37	0	20,603,192	12,833,000	0	2,113,536	expected "25000000 ", got "24967232 "
4	Apr 24, 2025 23:36	4,103	25,948,166	12,119,000	1,009,000	2,494,464
5	Apr 25, 2025 20:59	4,112	25,888,868	12,147,000	1,012,000	2,273,280
6	Apr 24, 2025 23:36	4,122	33,894,112	12,176,000	1,014,000	2,494,464
7	Apr 25, 2025 20:58	4,123	26,807,520	12,179,000	1,014,000	2,494,464
8	Apr 24, 2025 23:35	4,135	34,519,360	13,233,000	0	2,486,272
9	Apr 24, 2025 23:36	4,135	25,162,551	13,231,000	0	2,494,464
10	Apr 24, 2025 23:36	4,135	30,010,446	13,233,000	0	2,494,464
11	Apr 24, 2025 23:35	4,137	32,958,464	13,238,000	0	2,502,656
12	Apr 24, 2025 23:36	4,139	36,250,081	13,246,000	0	2,273,280
13	Apr 24, 2025 23:36	4,140	29,001,981	13,247,000	0	2,273,280
14	Apr 24, 2025 23:36	4,141	28,926,953	13,252,000	0	2,273,280
15	Apr 25, 2025 20:59	4,145	29,887,608	13,264,000	0	2,494,464
16	Apr 24, 2025 23:36	4,145	28,910,630	13,263,000	0	2,273,280
17	Apr 24, 2025 23:36	4,145	33,441,756	13,263,000	0	2,498,560
18	Apr 25, 2025 20:58	4,146	32,811,319	13,268,000	0	2,273,280
19	Apr 25, 2025 20:59	4,152	32,150,598	13,287,000	0	2,273,280
20	Apr 25, 2025 20:59	4,158	32,740,283	13,307,000	0	2,531,328
21	Apr 25, 2025 20:58	4,159	28,954,312	13,309,000	0	2,498,560
22	Apr 24, 2025 23:36	4,163	29,625,072	13,320,000	0	2,498,560
23	Apr 24, 2025 23:36	4,165	30,057,470	13,328,000	0	2,273,280
24	Apr 25, 2025 20:59	4,165	30,911,934	13,328,000	0	2,531,328
25	Apr 24, 2025 23:36	4,167	29,699,902	13,333,000	0	2,273,280
26	Apr 24, 2025 23:36	4,168	26,670,489	13,336,000	0	2,273,280
27	Apr 24, 2025 23:36	4,170	34,240,083	13,345,000	0	2,490,368
28	Apr 25, 2025 20:58	4,172	26,749,145	13,351,000	0	2,273,280
29	Apr 25, 2025 20:58	4,173	27,142,366	13,355,000	0	2,531,328
30	Apr 24, 2025 23:36	4,175	29,616,760	13,359,000	0	2,273,280
31	Apr 24, 2025 23:36	4,187	38,195,797	13,399,000	0	2,273,280
32	Apr 25, 2025 20:58	4,188	29,942,364	13,401,000	0	2,273,280
33	Apr 24, 2025 23:36	4,191	25,587,592	13,411,000	0	2,498,560
34	Apr 24, 2025 23:35	4,191	27,976,185	13,412,000	0	2,498,560
35	Apr 24, 2025 23:36	4,196	28,095,363	13,428,000	0	2,273,280
36	Apr 25, 2025 20:59	4,209	34,879,537	13,468,000	0	2,531,328

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