{"id":29626,"date":"2024-03-18T21:44:26","date_gmt":"2024-03-18T12:44:26","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e8%87%aa%e5%8b%95%e7%9a%84%e3%81%absnake%e3%82%b2%e3%83%bc%e3%83%a0%e3%82%92%e8%a7%a3%e3%81%8f\/"},"modified":"2024-03-22T21:26:09","modified_gmt":"2024-03-22T12:26:09","slug":"java%e3%81%a7%e8%87%aa%e5%8b%95%e7%9a%84%e3%81%absnake%e3%82%b2%e3%83%bc%e3%83%a0%e3%82%92%e8%a7%a3%e3%81%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e8%87%aa%e5%8b%95%e7%9a%84%e3%81%absnake%e3%82%b2%e3%83%bc%e3%83%a0%e3%82%92%e8%a7%a3%e3%81%8f\/","title":{"rendered":"Java\u3067\u81ea\u52d5\u7684\u306bSnake\u30b2\u30fc\u30e0\u3092\u89e3\u304f"},"content":{"rendered":"<p>\u81ea\u52d5\u30d8\u30d3\u30b2\u30fc\u30e0\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u304c\u3001\u4ee5\u4e0b\u306b\u6df1\u3055\u512a\u5148\u63a2\u7d22\uff08DFS\uff09\u306b\u57fa\u3065\u304f1\u3064\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n<ol>\n<li>\u30b2\u30fc\u30e0\u30de\u30c3\u30d7\u3092\u8868\u3059\u305f\u3081\u306b\u30012\u6b21\u5143\u914d\u5217\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u30011\u306f\u86c7\u306e\u4f53\u3092\u8868\u3057\u30010\u306f\u7a7a\u304d\u5730\u3092\u8868\u3057\u3001-1\u306f\u98df\u3079\u7269\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li>\u86c7\u306e\u982d\u90e8\u306e4\u3064\u306e\u53ef\u80fd\u306a\u79fb\u52d5\u65b9\u5411\u3092\u793a\u3059\u65b9\u5411\u914d\u5217\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u305d\u308c\u306f\u4e0a\u3001\u4e0b\u3001\u5de6\u3001\u53f3\u3067\u3059\u3002<\/li>\n<li>\u86c7\u306e\u79fb\u52d5\u7d4c\u8def\u3092\u4fdd\u5b58\u3059\u308b\u30b9\u30bf\u30c3\u30af\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<li>\u73fe\u5728\u306e\u4f4d\u7f6e\u304c\u98df\u3079\u7269\u3067\u3042\u308c\u3070\u3001\u771f\u3092\u8fd4\u3059\u3002<\/li>\n<li>\uff14\u3064\u306e\u79fb\u52d5\u65b9\u5411\u3092\u8d70\u67fb\u3059\u308b\uff1a\u3082\u3057\u3082\u305d\u306e\u65b9\u5411\u304c\u6709\u52b9\u306a\u79fb\u52d5\u3067\u3042\u308b\uff08\u67a0\u5916\u306b\u51fa\u306a\u3044\u3057\u3001\u86c7\u306e\u4f53\u304c\u306a\u3044\u5834\u5408\uff09\u3001\u86c7\u306e\u982d\u3092\u305d\u306e\u4f4d\u7f6e\u306b\u79fb\u52d5\u3057\u3001\u305d\u306e\u4f4d\u7f6e\u3092\u86c7\u306e\u4f53\u3068\u3057\u3066\u8a2d\u5b9a\u3059\u308b\u3002<br \/>\n\u305d\u306e\u4f4d\u7f6e\u3092\u30b9\u30bf\u30c3\u30af\u306b\u7a4d\u3080\u3002<br \/>\nDFS\u63a2\u7d22\u95a2\u6570\u3092\u518d\u5e30\u7684\u306b\u547c\u3073\u51fa\u3059\u3002<br \/>\n\u3082\u3057\u771f\u304c\u8fd4\u3063\u3066\u304d\u305f\u3089\u3001\u771f\u3092\u8fd4\u3059\u3002<br \/>\n\u3082\u3057\u507d\u304c\u8fd4\u3063\u3066\u304d\u305f\u3089\u3001\u86c7\u306e\u982d\u306e\u4f4d\u7f6e\u3092\u5143\u306e\u4f4d\u7f6e\u306b\u623b\u3057\u3001\u305d\u306e\u4f4d\u7f6e\u3092\u7a7a\u5730\u306b\u8a2d\u5b9a\u3057\u3001\u305d\u306e\u4f4d\u7f6e\u3092\u30b9\u30bf\u30c3\u30af\u304b\u3089\u5916\u3059\u3002<\/li>\n<li>\u5618\u3060\u3002<\/li>\n<li>\u4e3b\u95a2\u6570\u3067DFS\u63a2\u7d22\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u3001\u771f\u304c\u8fd4\u3055\u308c\u305f\u5834\u5408\u306b\u306f\u3001\u30d1\u30b9\u30b9\u30bf\u30c3\u30af\u5185\u306e\u8981\u7d20\u3092\u51fa\u529b\u3057\u3001\u305d\u308c\u304c\u81ea\u52d5\u30b9\u30cd\u30fc\u30af\u306e\u89e3\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u306f\u7c21\u5358\u306aJava\u30b3\u30fc\u30c9\u306e\u4f8b\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.*;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">AutoSnake<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">int<\/span>[][] map;\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">int<\/span>[][] directions = {{-<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">0<\/span>}, {<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">0<\/span>}, {<span class=\"hljs-number\">0<\/span>, -<span class=\"hljs-number\">1<\/span>}, {<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">1<\/span>}};\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> Stack&lt;<span class=\"hljs-type\">int<\/span>[]&gt; path;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">dfs<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> x, <span class=\"hljs-type\">int<\/span> y)<\/span> {\r\n        <span class=\"hljs-keyword\">if<\/span> (map[x][y] == -<span class=\"hljs-number\">1<\/span>) {\r\n            <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\r\n        }\r\n\r\n        <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span>[] direction : directions) {\r\n            <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">newX<\/span> <span class=\"hljs-operator\">=<\/span> x + direction[<span class=\"hljs-number\">0<\/span>];\r\n            <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">newY<\/span> <span class=\"hljs-operator\">=<\/span> y + direction[<span class=\"hljs-number\">1<\/span>];\r\n\r\n            <span class=\"hljs-keyword\">if<\/span> (isValidMove(newX, newY)) {\r\n                map[newX][newY] = <span class=\"hljs-number\">1<\/span>;\r\n                path.push(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">int<\/span>[]{newX, newY});\r\n\r\n                <span class=\"hljs-keyword\">if<\/span> (dfs(newX, newY)) {\r\n                    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\r\n                }\r\n\r\n                map[newX][newY] = <span class=\"hljs-number\">0<\/span>;\r\n                path.pop();\r\n            }\r\n        }\r\n\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">false<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">isValidMove<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> x, <span class=\"hljs-type\">int<\/span> y)<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> x &gt;= <span class=\"hljs-number\">0<\/span> &amp;&amp; x &lt; map.length &amp;&amp; y &gt;= <span class=\"hljs-number\">0<\/span> &amp;&amp; y &lt; map[<span class=\"hljs-number\">0<\/span>].length &amp;&amp; map[x][y] == <span class=\"hljs-number\">0<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u5316\u5730\u56fe<\/span>\r\n        map = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">int<\/span>[<span class=\"hljs-number\">5<\/span>][<span class=\"hljs-number\">5<\/span>];\r\n        map[<span class=\"hljs-number\">0<\/span>][<span class=\"hljs-number\">0<\/span>] = <span class=\"hljs-number\">1<\/span>;  <span class=\"hljs-comment\">\/\/ \u86c7\u5934\u4f4d\u7f6e<\/span>\r\n        map[<span class=\"hljs-number\">2<\/span>][<span class=\"hljs-number\">2<\/span>] = -<span class=\"hljs-number\">1<\/span>;  <span class=\"hljs-comment\">\/\/ \u98df\u7269\u4f4d\u7f6e<\/span>\r\n\r\n        path = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Stack<\/span>&lt;&gt;();\r\n        path.push(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">int<\/span>[]{<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>});\r\n\r\n        <span class=\"hljs-keyword\">if<\/span> (dfs(<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>)) {\r\n            System.out.println(<span class=\"hljs-string\">\"\u627e\u5230\u8def\u5f84\uff1a\"<\/span>);\r\n            <span class=\"hljs-keyword\">while<\/span> (!path.isEmpty()) {\r\n                <span class=\"hljs-type\">int<\/span>[] pos = path.pop();\r\n                System.out.println(<span class=\"hljs-string\">\"(\"<\/span> + pos[<span class=\"hljs-number\">0<\/span>] + <span class=\"hljs-string\">\", \"<\/span> + pos[<span class=\"hljs-number\">1<\/span>] + <span class=\"hljs-string\">\")\"<\/span>);\r\n            }\r\n        } <span class=\"hljs-keyword\">else<\/span> {\r\n            System.out.println(<span class=\"hljs-string\">\"\u672a\u627e\u5230\u8def\u5f84\"<\/span>);\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u308c\u306f\u5358\u7d14\u306a\u5b9f\u88c5\u65b9\u6cd5\u3067\u3042\u308a\u3001\u86c7\u304c\u81ea\u5df1\u3092\u9589\u3058\u8fbc\u3081\u308b\u306a\u3069\u306e\u8907\u96d1\u306a\u72b6\u6cc1\u3092\u51e6\u7406\u3067\u304d\u307e\u305b\u3093\u306e\u3067\u3001\u81ea\u52d5\u7684\u306a\u30b9\u30cd\u30fc\u30af\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u3088\u308a\u5f37\u529b\u306b\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u5e45\u512a\u5148\u63a2\u7d22\uff08BFS\uff09\u3084A*\u63a2\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306a\u3069\u306e\u9ad8\u5ea6\u306a\u63a2\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3001\u86c7\u306e\u9577\u3055\u3084\u86c7\u306e\u65b9\u5411\u306a\u3069\u306e\u4ed6\u306e\u8981\u7d20\u3082\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u81ea\u52d5\u30d8\u30d3\u30b2\u30fc\u30e0\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u304c\u3001\u4ee5\u4e0b\u306b\u6df1\u3055\u512a\u5148\u63a2\u7d22\uff08DFS\uff09\u306b\u57fa\u3065\u304f1\u3064\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a \u30b2\u30fc\u30e0\u30de\u30c3\u30d7\u3092\u8868\u3059\u305f\u3081\u306b\u30012\u6b21\u5143\u914d\u5217\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u30011\u306f\u86c7\u306e\u4f53\u3092\u8868\u3057\u30010\u306f\u7a7a\u304d\u5730 [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-29626","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u3067\u81ea\u52d5\u7684\u306bSnake\u30b2\u30fc\u30e0\u3092\u89e3\u304f - 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\" 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\u30b2\u30fc\u30e0\u30de\u30c3\u30d7\u3092\u8868\u3059\u305f\u3081\u306b\u30012\u6b21\u5143\u914d\u5217\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u30011\u306f\u86c7\u306e\u4f53\u3092\u8868\u3057\u30010\u306f\u7a7a\u304d\u5730 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u81ea\u52d5\u7684\u306bsnake\u30b2\u30fc\u30e0\u3092\u89e3\u304f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-18T12:44:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T12:26:09+00:00\" \/>\n<meta name=\"author\" content=\"\u590f\u6a39, \u98a8\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u590f\u6a39, \u98a8\" \/>\n\t<meta name=\"twitter:label2\" 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