{"id":45283,"date":"2023-02-06T04:53:29","date_gmt":"2023-07-08T05:25:19","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45283-2\/"},"modified":"2024-04-29T13:19:38","modified_gmt":"2024-04-29T05:19:38","slug":"45283-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45283-2\/","title":{"rendered":""},"content":{"rendered":"

\u8981\u7d04<\/h1>\n

C++ \u3060\u3068 11.44 \u79d2\u304b\u304b\u308b\u3082\u306e\u304c Rust \u3060\u3068 18.36 \u79d2\u3082\u304b\u304b\u3063\u3066\u9045\u3044\u3002\u306a\u305c\u3060\uff1f<\/p>\n

\u8b70\u8ad6\u3059\u308b\u5185\u5bb9<\/h2>\n

Leibniz \u7d1a\u6570\u3068\u3044\u3046\u3082\u306e\u3092\u4f7f\u3063\u3066\u5186\u5468\u7387\u3092\u8a08\u7b97\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092 Rust \u3068 C++ \u3067\u5b9f\u88c5\u3057\u3066\u901f\u5ea6\u3092\u6bd4\u8f03\u3059\u308b\u3002\u5b9f\u884c\u6642\u306b\u7d1a\u6570\u306e\u9805\u306e\u6570\u3092\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u3066\u8a08\u7b97\u3055\u305b\u308b\u3002\u3046\u307e\u304f\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u66f8\u3051\u3066\u3044\u308c\u3070\u3001Rust \u3068 C++\/Clang \u3067\u306f\u307b\u3068\u3093\u3069\u6027\u80fd\u304c\u5909\u308f\u3089\u306a\u3044\u306f\u305a\u3060\u304c\u2026<\/p>\n

Rust \u3067\u306e\u30b3\u30fc\u30c9\u30fb\u30b3\u30f3\u30d1\u30a4\u30eb\u30fb\u5b9f\u884c<\/h2>\n
use<\/span> std<\/span>::<\/span>env<\/span>;<\/span>\r\n\r\nfn<\/span> powersign<\/span>(<\/span>n<\/span>:<\/span> i64<\/span>)<\/span> -><\/span> i64<\/span> {<\/span>\r\n    if<\/span> n<\/span> %<\/span> 2<\/span> ==<\/span> 0<\/span> {<\/span>\r\n        1<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        -<\/span>1<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> leibniz<\/span>(<\/span>n<\/span>:<\/span> i64<\/span>)<\/span> -><\/span> f64<\/span> {<\/span>\r\n    let<\/span> mut<\/span> s<\/span>:<\/span> f64<\/span> =<\/span> 0.0<\/span>;<\/span>\r\n    for<\/span> k<\/span> in<\/span> 0<\/span>..=<\/span>n<\/span> {<\/span>\r\n        s<\/span> +=<\/span> powersign<\/span>(<\/span>k<\/span>)<\/span> as<\/span> f64<\/span>\/<\/span> (<\/span>2<\/span> *<\/span> k<\/span> +<\/span> 1<\/span>)<\/span> as<\/span> f64<\/span>;<\/span>\r\n    }<\/span>\r\n    4.0<\/span> *<\/span> s<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> args<\/span>:<\/span> Vec<\/span><<\/span>String<\/span>><\/span> =<\/span> env<\/span>::<\/span>args<\/span>()<\/span>.collect<\/span>();<\/span>\r\n    let<\/span> n<\/span> =<\/span> &<\/span>args<\/span>[<\/span>1<\/span>]<\/span>.parse<\/span>::<\/span><<\/span>i64<\/span>><\/span>()<\/span>.unwrap<\/span>();<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> leibniz<\/span>(<\/span>*<\/span>n<\/span>));<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30b3\u30f3\u30d1\u30a4\u30eb\uff1a<\/p>\n
$<\/span> rustc -C<\/span> opt-level=<\/span>3 -o<\/span> leibniz-rust leibniz.rs\r\n<\/code><\/pre>\n
\u5b9f\u884c\uff1a<\/p>\n
$<\/span> time<\/span> .\/leibniz-rust 10000000000\r\n3.141592653688346\r\n\r\n________________________________________________________\r\nExecuted in   19.24 secs    fish           external\r\n   usr time   18.36 secs    0.16 millis   18.36 secs\r\n   sys time    0.04 secs    1.74 millis    0.04 secs\r\n<\/span><\/code><\/pre>\n
C++ \u3067\u306e\u5b9f\u88c5\u30fb\u30b3\u30f3\u30d1\u30a4\u30eb\u30fb\u5b9f\u884c<\/h2>\n
#include<\/span> <cstdint><\/span>\r\n#include<\/span> <sstream><\/span>\r\n#include<\/span> <iostream><\/span>\r\n#include<\/span> <limits><\/span>\r\n\r\ntemplate<\/span> <<\/span>typename<\/span> T<\/span>><\/span>\r\nauto<\/span> is_even<\/span>(<\/span>T<\/span> n<\/span>)<\/span> {<\/span>\r\n    return<\/span> n<\/span> %<\/span> T<\/span>{<\/span>2<\/span>}<\/span> ==<\/span> T<\/span>{<\/span>0<\/span>};<\/span>\r\n}<\/span>\r\n\r\ntemplate<\/span> <<\/span>typename<\/span> T<\/span>><\/span>\r\nauto<\/span> powersign<\/span>(<\/span>T<\/span> n<\/span>)<\/span> {<\/span>\r\n    return<\/span> is_even<\/span>(<\/span>n<\/span>)<\/span> ?<\/span> T<\/span>{<\/span>1<\/span>}<\/span> :<\/span> T<\/span>{<\/span>-<\/span>1<\/span>};<\/span>\r\n}<\/span>\r\n\r\ntemplate<\/span> <<\/span>typename<\/span> T<\/span>><\/span>\r\nauto<\/span> leibniz<\/span>(<\/span>T<\/span> n<\/span>)<\/span> {<\/span>\r\n\tusing<\/span> F<\/span> =<\/span> double<\/span>;<\/span>\r\n    auto<\/span> s<\/span> =<\/span> F<\/span>{<\/span>0<\/span>};<\/span>\r\n    for<\/span> (<\/span>auto<\/span> k<\/span> =<\/span> T<\/span>{<\/span>0<\/span>};<\/span> k<\/span> <=<\/span> n<\/span>;<\/span> k<\/span>++<\/span>)<\/span> {<\/span>\r\n        s<\/span> +=<\/span> static_cast<\/span><<\/span>F<\/span>><\/span>(<\/span>powersign<\/span>(<\/span>k<\/span>))<\/span> \/<\/span> static_cast<\/span><<\/span>F<\/span>><\/span>(<\/span>T<\/span>{<\/span>2<\/span>}<\/span> *<\/span> k<\/span> +<\/span> T<\/span>{<\/span>1<\/span>});<\/span>\r\n    }<\/span>\r\n    return<\/span> F<\/span>{<\/span>4<\/span>}<\/span> *<\/span> s<\/span>;<\/span>\r\n}<\/span>\r\n\r\nint<\/span> main<\/span>(<\/span>int<\/span>,<\/span> char<\/span> *<\/span> argv<\/span>[])<\/span> {<\/span>\r\n    std<\/span>::<\/span>stringstream<\/span> stream<\/span>;<\/span>\r\n    stream<\/span> <<<\/span> argv<\/span>[<\/span>1<\/span>];<\/span>\r\n    int64_t<\/span> n<\/span>;<\/span>\r\n    stream<\/span> >><\/span> n<\/span>;<\/span>\r\n\r\n    typedef<\/span> std<\/span>::<\/span>numeric_limits<\/span><<\/span>double<\/span>><\/span> lim<\/span>;<\/span>\r\n    std<\/span>::<\/span>cout<\/span>.<\/span>precision<\/span>(<\/span>lim<\/span>::<\/span>max_digits10<\/span>);<\/span>\r\n    std<\/span>::<\/span>cout<\/span> <<<\/span> leibniz<\/span>(<\/span>n<\/span>)<\/span> <<<\/span> std<\/span>::<\/span>endl<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30b3\u30f3\u30d1\u30a4\u30eb\uff1a<\/p>\n
$<\/span> clang++ -O3<\/span> -o<\/span> leibniz-c++ leibniz.cpp\r\n<\/code><\/pre>\n
\u5b9f\u884c\uff1a<\/p>\n
$<\/span> time<\/span> .\/leibniz-c++ 10000000000\r\n3.1415926536883458\r\n\r\n________________________________________________________\r\nExecuted in   11.50 secs    fish           external\r\n   usr time   11.44 secs    0.11 millis   11.44 secs\r\n   sys time    0.03 secs    1.02 millis    0.03 secs\r\n<\/span><\/code><\/pre>\n
\u8003\u5bdf<\/h2>\n
C++ \u3067\u5b9f\u88c5\u3057 Clang-15.0.7 \u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u305f\u3082\u306e\u3060\u3068 11.44 \u79d2\u304b\u304b\u308b\u3082\u306e\u304c Rust\/rustc-1.67.1 \u3060\u3068 18.36 \u79d2\u3082\u304b\u304b\u308b\u3002\u9045\u3059\u304e\u308b\u3002<\/p>\n
\u6614\uff08\u6570\u5e74\u524d\uff09\u3001\u540c\u69d8\u306e\u30b3\u30fc\u30c9\u3067\u901f\u5ea6\u5dee\u3092\u30c6\u30b9\u30c8\u3057\u305f\u3068\u304d\u306f\u3001\u5dee\u7570\u306f\u307b\u3068\u3093\u3069\u306a\u304b\u3063\u305f\u306f\u305a\u306a\u306e\u306b\u3001\u306a\u305c\u306a\u306e\u3060\u308d\u3046\u304b\u3002\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u60aa\u304f\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u306e\u3060\u308d\u3046\u304b\u3002\u306a\u305c Rust \u306e\u30b3\u30fc\u30c9\u304c\u9045\u3044\u306e\u304b\u308f\u304b\u308b\u65b9\u304c\u3044\u3089\u3063\u3057\u3083\u3063\u305f\u3089\u6559\u3048\u3066\u4e0b\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8981\u7d04 C++ \u3060\u3068 11.44 \u79d2\u304b\u304b\u308b\u3082\u306e\u304c Rust \u3060\u3068 18.36 \u79d2\u3082\u304b\u304b\u3063\u3066\u9045\u3044\u3002\u306a\u305c\u3060\uff1f \u8b70\u8ad6\u3059 […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45283","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/45283-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u8981\u7d04 C++ \u3060\u3068 11.44 \u79d2\u304b\u304b\u308b\u3082\u306e\u304c Rust \u3060\u3068 18.36 \u79d2\u3082\u304b\u304b\u3063\u3066\u9045\u3044\u3002\u306a\u305c\u3060\uff1f \u8b70\u8ad6\u3059 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45283-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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