{"id":25395,"date":"2024-03-17T04:18:14","date_gmt":"2024-03-16T19:18:14","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%a7%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%83%9e%e3%83%83%e3%83%81%e3%83%b3%e3%82%b0%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%81%af%e3%81%a9%e3%81%ae%e3%82%88\/"},"modified":"2024-03-22T11:23:38","modified_gmt":"2024-03-22T02:23:38","slug":"c%e8%a8%80%e8%aa%9e%e3%81%a7%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%83%9e%e3%83%83%e3%83%81%e3%83%b3%e3%82%b0%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%81%af%e3%81%a9%e3%81%ae%e3%82%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%a7%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%83%9e%e3%83%83%e3%83%81%e3%83%b3%e3%82%b0%e3%82%a2%e3%83%ab%e3%82%b4%e3%83%aa%e3%82%ba%e3%83%a0%e3%81%af%e3%81%a9%e3%81%ae%e3%82%88\/","title":{"rendered":"C\u8a00\u8a9e\u3067\u306e\u6587\u5b57\u5217\u30de\u30c3\u30c1\u30f3\u30b0\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3069\u306e\u3088\u3046\u306b\u66f8\u304b\u308c\u307e\u3059\u304b\u3002"},"content":{"rendered":"<p>C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u30de\u30c3\u30c1\u30f3\u30b0\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u306f\u305f\u304f\u3055\u3093\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4ee5\u4e0b\u3067\u3044\u304f\u3064\u304b\u4e00\u822c\u7684\u306a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5b9f\u88c5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u30d6\u30eb\u30fc\u30c8\u30d5\u30a9\u30fc\u30b9\u6cd5\uff08\u7d20\u6734\u306a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\uff09<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">strStr<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* haystack, <span class=\"hljs-type\">char<\/span>* needle)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> i, j;\r\n    <span class=\"hljs-type\">int<\/span> len1 = <span class=\"hljs-built_in\">strlen<\/span>(haystack);\r\n    <span class=\"hljs-type\">int<\/span> len2 = <span class=\"hljs-built_in\">strlen<\/span>(needle);\r\n    \r\n    <span class=\"hljs-keyword\">for<\/span> (i = <span class=\"hljs-number\">0<\/span>; i &lt;= len1 - len2; i++) {\r\n        <span class=\"hljs-keyword\">for<\/span> (j = <span class=\"hljs-number\">0<\/span>; j &lt; len2; j++) {\r\n            <span class=\"hljs-keyword\">if<\/span> (haystack[i + j] != needle[j]) {\r\n                <span class=\"hljs-keyword\">break<\/span>;\r\n            }\r\n        }\r\n        <span class=\"hljs-keyword\">if<\/span> (j == len2) {\r\n            <span class=\"hljs-keyword\">return<\/span> i;\r\n        }\r\n    }\r\n    \r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>KMP\u6cd5\uff08\u30af\u30cc\u30fc\u30b9\u30fb\u30e2\u30ea\u30b9\u30fb\u30d7\u30e9\u30c3\u30c8\u6cd5\uff09<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">void<\/span> <span class=\"hljs-title function_\">getNext<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* needle, <span class=\"hljs-type\">int<\/span>* next)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> i, j;\r\n    <span class=\"hljs-type\">int<\/span> len = <span class=\"hljs-built_in\">strlen<\/span>(needle);\r\n    \r\n    next[<span class=\"hljs-number\">0<\/span>] = <span class=\"hljs-number\">-1<\/span>;\r\n    i = <span class=\"hljs-number\">0<\/span>;\r\n    j = <span class=\"hljs-number\">-1<\/span>;\r\n    <span class=\"hljs-keyword\">while<\/span> (i &lt; len) {\r\n        <span class=\"hljs-keyword\">if<\/span> (j == <span class=\"hljs-number\">-1<\/span> || needle[i] == needle[j]) {\r\n            i++;\r\n            j++;\r\n            next[i] = j;\r\n        } <span class=\"hljs-keyword\">else<\/span> {\r\n            j = next[j];\r\n        }\r\n    }\r\n}\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">strStr<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* haystack, <span class=\"hljs-type\">char<\/span>* needle)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> i, j;\r\n    <span class=\"hljs-type\">int<\/span> len1 = <span class=\"hljs-built_in\">strlen<\/span>(haystack);\r\n    <span class=\"hljs-type\">int<\/span> len2 = <span class=\"hljs-built_in\">strlen<\/span>(needle);\r\n    <span class=\"hljs-type\">int<\/span>* next = (<span class=\"hljs-type\">int<\/span>*)<span class=\"hljs-built_in\">malloc<\/span>(<span class=\"hljs-keyword\">sizeof<\/span>(<span class=\"hljs-type\">int<\/span>) * len2);\r\n    \r\n    getNext(needle, next);\r\n    \r\n    i = <span class=\"hljs-number\">0<\/span>;\r\n    j = <span class=\"hljs-number\">0<\/span>;\r\n    <span class=\"hljs-keyword\">while<\/span> (i &lt; len1 &amp;&amp; j &lt; len2) {\r\n        <span class=\"hljs-keyword\">if<\/span> (j == <span class=\"hljs-number\">-1<\/span> || haystack[i] == needle[j]) {\r\n            i++;\r\n            j++;\r\n        } <span class=\"hljs-keyword\">else<\/span> {\r\n            j = next[j];\r\n        }\r\n    }\r\n    \r\n    <span class=\"hljs-built_in\">free<\/span>(next);\r\n    <span class=\"hljs-keyword\">if<\/span> (j == len2) {\r\n        <span class=\"hljs-keyword\">return<\/span> i - j;\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>\u30dc\u30a4\u30e4\u30fc\u30fb\u30e0\u30fc\u30a2\u6cd5<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">define<\/span> MAX_CHAR 256<\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">max<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> a, <span class=\"hljs-type\">int<\/span> b)<\/span> {\r\n    <span class=\"hljs-keyword\">return<\/span> a &gt; b ? a : b;\r\n}\r\n\r\n<span class=\"hljs-type\">void<\/span> <span class=\"hljs-title function_\">badCharHeuristic<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* needle, <span class=\"hljs-type\">int<\/span>* badChar)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> i;\r\n    <span class=\"hljs-type\">int<\/span> len = <span class=\"hljs-built_in\">strlen<\/span>(needle);\r\n    <span class=\"hljs-keyword\">for<\/span> (i = <span class=\"hljs-number\">0<\/span>; i &lt; MAX_CHAR; i++) {\r\n        badChar[i] = <span class=\"hljs-number\">-1<\/span>;\r\n    }\r\n    <span class=\"hljs-keyword\">for<\/span> (i = <span class=\"hljs-number\">0<\/span>; i &lt; len; i++) {\r\n        badChar[(<span class=\"hljs-type\">int<\/span>)needle[i]] = i;\r\n    }\r\n}\r\n\r\n<span class=\"hljs-type\">void<\/span> <span class=\"hljs-title function_\">goodSuffixHeuristic<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* needle, <span class=\"hljs-type\">int<\/span>* goodSuffix)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> i, j;\r\n    <span class=\"hljs-type\">int<\/span> len = <span class=\"hljs-built_in\">strlen<\/span>(needle);\r\n    <span class=\"hljs-type\">int<\/span>* suffix = (<span class=\"hljs-type\">int<\/span>*)<span class=\"hljs-built_in\">malloc<\/span>(<span class=\"hljs-keyword\">sizeof<\/span>(<span class=\"hljs-type\">int<\/span>) * (len + <span class=\"hljs-number\">1<\/span>));\r\n    \r\n    <span class=\"hljs-keyword\">for<\/span> (i = <span class=\"hljs-number\">0<\/span>; i &lt;= len; i++) {\r\n        suffix[i] = <span class=\"hljs-number\">-1<\/span>;\r\n    }\r\n    \r\n    <span class=\"hljs-keyword\">for<\/span> (i = len - <span class=\"hljs-number\">1<\/span>; i &gt;= <span class=\"hljs-number\">0<\/span>; i--) {\r\n        <span class=\"hljs-keyword\">if<\/span> (suffix[i] == <span class=\"hljs-number\">-1<\/span>) {\r\n            suffix[i] = len - i - <span class=\"hljs-number\">1<\/span>;\r\n            <span class=\"hljs-keyword\">for<\/span> (j = <span class=\"hljs-number\">0<\/span>; j &lt; i; j++) {\r\n                <span class=\"hljs-keyword\">if<\/span> (needle[j] == needle[len - i + j]) {\r\n                    suffix[j] = len - i + j;\r\n                }\r\n            }\r\n        }\r\n    }\r\n    \r\n    <span class=\"hljs-keyword\">for<\/span> (i = <span class=\"hljs-number\">0<\/span>; i &lt; len; i++) {\r\n        goodSuffix[i] = len - suffix[i + <span class=\"hljs-number\">1<\/span>];\r\n    }\r\n    <span class=\"hljs-keyword\">for<\/span> (i = <span class=\"hljs-number\">0<\/span>; i &lt;= len; i++) {\r\n        goodSuffix[len] = len - suffix[i + <span class=\"hljs-number\">1<\/span>];\r\n    }\r\n    \r\n    <span class=\"hljs-built_in\">free<\/span>(suffix);\r\n}\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">strStr<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* haystack, <span class=\"hljs-type\">char<\/span>* needle)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>, j = <span class=\"hljs-number\">0<\/span>;\r\n    <span class=\"hljs-type\">int<\/span> len1 = <span class=\"hljs-built_in\">strlen<\/span>(haystack);\r\n    <span class=\"hljs-type\">int<\/span> len2 = <span class=\"hljs-built_in\">strlen<\/span>(needle);\r\n    <span class=\"hljs-type\">int<\/span> badChar[MAX_CHAR];\r\n    <span class=\"hljs-type\">int<\/span>* goodSuffix = (<span class=\"hljs-type\">int<\/span>*)<span class=\"hljs-built_in\">malloc<\/span>(<span class=\"hljs-keyword\">sizeof<\/span>(<span class=\"hljs-type\">int<\/span>) * (len2 + <span class=\"hljs-number\">1<\/span>));\r\n    \r\n    badCharHeuristic(needle, badChar);\r\n    goodSuffixHeuristic(needle, goodSuffix);\r\n    \r\n    <span class=\"hljs-keyword\">while<\/span> (i &lt;= len1 - len2) {\r\n        j = len2 - <span class=\"hljs-number\">1<\/span>;\r\n        <span class=\"hljs-keyword\">while<\/span> (j &gt;= <span class=\"hljs-number\">0<\/span> &amp;&amp; needle[j] == haystack[i + j]) {\r\n            j--;\r\n        }\r\n        <span class=\"hljs-keyword\">if<\/span> (j &lt; <span class=\"hljs-number\">0<\/span>) {\r\n            <span class=\"hljs-built_in\">free<\/span>(goodSuffix);\r\n            <span class=\"hljs-keyword\">return<\/span> i;\r\n        } <span class=\"hljs-keyword\">else<\/span> {\r\n            i += max(goodSuffix[j], j - badChar[(<span class=\"hljs-type\">int<\/span>)haystack[i + j]]);\r\n        }\r\n    }\r\n    \r\n    <span class=\"hljs-built_in\">free<\/span>(goodSuffix);\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306f\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b\u3044\u304f\u3064\u304b\u306e\u6587\u5b57\u5217\u30de\u30c3\u30c1\u30f3\u30b0\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306eC\u8a00\u8a9e\u7248\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u30de\u30c3\u30c1\u30f3\u30b0\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u306f\u305f\u304f\u3055\u3093\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4ee5\u4e0b\u3067\u3044\u304f\u3064\u304b\u4e00\u822c\u7684\u306a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5b9f\u88c5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002 \u30d6\u30eb\u30fc\u30c8\u30d5\u30a9\u30fc\u30b9\u6cd5\uff08\u7d20\u6734\u306a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\uff09 int strStr(char* haystack,  [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-25395","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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