{"id":420,"date":"2023-02-21T04:39:42","date_gmt":"2023-06-20T13:28:20","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%a7%e3%81%ae%e6%9c%80%e5%a4%a7%e3%83%92%e3%83%bc%e3%83%97%e3%83%87%e3%83%bc%e3%82%bf%e6%a7%8b%e9%80%a0%e3%81%ae%e5%ae%9f%e8%a3%85\/"},"modified":"2025-07-31T23:27:12","modified_gmt":"2025-07-31T14:27:12","slug":"java%e3%81%a7%e3%81%ae%e6%9c%80%e5%a4%a7%e3%83%92%e3%83%bc%e3%83%97%e3%83%87%e3%83%bc%e3%82%bf%e6%a7%8b%e9%80%a0%e3%81%ae%e5%ae%9f%e8%a3%85","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%81%ae%e6%9c%80%e5%a4%a7%e3%83%92%e3%83%bc%e3%83%97%e3%83%87%e3%83%bc%e3%82%bf%e6%a7%8b%e9%80%a0%e3%81%ae%e5%ae%9f%e8%a3%85\/","title":{"rendered":"Java\u3067\u306e\u6700\u5927\u30d2\u30fc\u30d7\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u5b9f\u88c5"},"content":{"rendered":"

\u6700\u5927\u30d2\u30fc\u30d7\u306f\u3001\u3042\u308b\u30ce\u30fc\u30c9\u306e\u5024\u304c\u305d\u306e\u5b50\u30ce\u30fc\u30c9\u306e\u5024\u4ee5\u4e0a\u3067\u3042\u308b\u5b8c\u5168\u4e8c\u5206\u6728\u3067\u3059\u3002\u6700\u5927\u30d2\u30fc\u30d7\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u306f\u3001\u30d2\u30fc\u30d7\u30bd\u30fc\u30c8\u3092\u7528\u3044\u3066\u30c7\u30fc\u30bf\u3092\u30bd\u30fc\u30c8\u3059\u308b\u969b\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001Java\u3067\u6700\u5927\u30d2\u30fc\u30d7\u3092\u30b9\u30af\u30e9\u30c3\u30c1\u304b\u3089\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u3059\u3079\u3066\u306e\u3053\u3068\u3092\u30ab\u30d0\u30fc\u3057\u307e\u3059\u3002<\/p>\n

Java\u3067\u306e\u6700\u5927\u30d2\u30fc\u30d7\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u5b9f\u88c5<\/h2>\n

\u79c1\u305f\u3061\u306f\u914d\u5217\u3092\u4f7f\u7528\u3057\u3066\u30d2\u30fc\u30d7\u3092\u8868\u73fe\u3057\u307e\u3059\u3002\u30d2\u30fc\u30d7\u306f\u5b8c\u5168\u4e8c\u5206\u6728\u3067\u3042\u308b\u305f\u3081\u3001\u30b9\u30da\u30fc\u30b9\u306e\u6d6a\u8cbb\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n

\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306a\u30d2\u30fc\u30d7\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n

\"Heap\"<\/div>\n

\u914d\u5217\u306e\u8868\u73fe\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n

\"Array\"<\/div>\n

\u6700\u5927\u30d2\u30fc\u30d7\u306e\u5ba3\u8a00\u306f\u6b21\u306e\u3088\u3046\u306b\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n

 static<\/span> class<\/span> MaxHeap<\/span> {<\/span>\r\n        private<\/span> int<\/span>[<\/span>]<\/span> Heap<\/span>;<\/span> \/\/ array <\/span>\r\n        private<\/span> int<\/span> size;<\/span>\r\n        private<\/span> int<\/span> maxsize;<\/span> \r\n\r\n        public<\/span> MaxHeap<\/span>(<\/span>int<\/span> size)<\/span> {<\/span>\r\n            this<\/span>.<\/span>maxsize =<\/span> size;<\/span>\r\n            this<\/span>.<\/span>size =<\/span> 0<\/span>;<\/span>\r\n            Heap<\/span> =<\/span> new<\/span> int<\/span>[<\/span>this<\/span>.<\/span>maxsize +<\/span> 1<\/span>]<\/span>;<\/span>\r\n            Heap<\/span>[<\/span>0<\/span>]<\/span> =<\/span> Integer<\/span>.<\/span>MAX_VALUE<\/span>;<\/span>\r\n        }<\/span>\r\n<\/code><\/pre>\n
\u30d2\u30fc\u30d7\u306f\u3001\u6700\u5927\u30d2\u30fc\u30d7\u3092\u683c\u7d0d\u3059\u308b\u914d\u5217\u3067\u3059\u3002\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u30b5\u30a4\u30ba\u3092\u53d7\u3051\u53d6\u308a\u3001\u914d\u5217\u3092\u7121\u9650\u5927\u306e0\u756a\u76ee\u306e\u8981\u7d20\u3067\u521d\u671f\u5316\u3057\u307e\u3059\u3002\u30d2\u30fc\u30d7\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b91\u304b\u3089\u59cb\u3081\u307e\u3059\u3002<\/p>\n
1. \u30ce\u30fc\u30c9\u306e\u89aa\u3092\u53d6\u5f97\u3059\u308b (N\u014ddo no oyako o shutoku suru)<\/h3>\n
\u79c1\u305f\u3061\u306f\u30d2\u30fc\u30d7\u3092\u914d\u5217\u3068\u3057\u3066\u4fdd\u5b58\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30ce\u30fc\u30c9\u306e\u89aa\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u8981\u7d20i\u306e\u89aa\u306e\u4f4d\u7f6e\u306f\u6b21\u306e\u3088\u3046\u306b\u4e0e\u3048\u3089\u308c\u307e\u3059\uff1a<\/p>\n
(<\/span>i)<\/span>\/<\/span>2<\/span>\r\n<\/code><\/pre>\n
\u5b9f\u88c5\u4e2d\u306f\u3001\u6b21\u306e\u65b9\u6cd5\u3067\u89aa\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
private<\/span> int<\/span> parent<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n            return<\/span> pos \/<\/span> 2<\/span>;<\/span>\r\n        }<\/span>\r\n<\/code><\/pre>\n
\uff12\uff0e\u30ce\u30fc\u30c9\u306b\u5b50\u4f9b\u3092\u53d6\u5f97\u3059\u308b<\/h3>\n
\u4f4d\u7f6ei\u306b\u3042\u308b\u30ce\u30fc\u30c9\u306e\u5b50\u30ce\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u5f0f\u3067\u4e0e\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n
\u5de6\u306e\u5b50\u4f9b: \u5de6\u5074\u306e\u5b50\u4f9b<\/p>\n
(<\/span>2<\/span>*<\/span>i)<\/span>\r\n<\/code><\/pre>\n
\u53f3\u306e\u5b50\u4f9b : Migi no kodomo<\/p>\n
(<\/span>2<\/span>*<\/span>i)<\/span>+<\/span> 1<\/span>\r\n<\/code><\/pre>\n
\u6ce8\u610f\uff1a\u30d2\u30fc\u30d7\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c1\u304b\u3089\u59cb\u307e\u308b\u5834\u5408\u306b\u9650\u308a\u3001\u5de6\u306e\u5b50\u30ce\u30fc\u30c9\u3068\u53f3\u306e\u5b50\u30ce\u30fc\u30c9\u306e\u5024\u306f\u305d\u308c\u305e\u308c(2*i) + 1\u3068(2*i) + 2\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u30b3\u30fc\u30c9\u3067\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n
  private<\/span> int<\/span> leftChild<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n            return<\/span> (<\/span>2<\/span> *<\/span> pos)<\/span> ;<\/span>\r\n        }<\/span>\r\n\r\n  private<\/span> int<\/span> rightChild<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n            return<\/span> (<\/span>2<\/span> *<\/span> pos)<\/span> +<\/span> 1<\/span>;<\/span>\r\n        }<\/span>\r\n<\/code><\/pre>\n
\uff13\uff0e\u65b0\u3057\u304f\u633f\u5165\u3055\u308c\u305f\u8981\u7d20\u3092\u30d2\u30fc\u30d7\u5316\u3059\u308b\u3002<\/h3>\n
\u8981\u7d20\u3092\u30d2\u30fc\u30d7\u306b\u633f\u5165\u3057\u305f\u5f8c\u3001\u30d2\u30fc\u30d7\u306e\u6027\u8cea\u304c\u6e80\u305f\u3055\u308c\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u30d2\u30fc\u30d7\u306e\u4f4d\u7f6e\u3092\u8abf\u6574\u3057\u3066\u518d\u3073\u30d2\u30fc\u30d7\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u306f\u30d2\u30fc\u30d7\u5316\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u6700\u5927\u30d2\u30fc\u30d7\u3067\u8981\u7d20\u3092\u30d2\u30fc\u30d7\u5316\u3059\u308b\u306b\u306f\u3001\u305d\u306e\u5b50\u8981\u7d20\u306e\u4e2d\u3067\u6700\u5927\u5024\u3092\u898b\u3064\u3051\u3001\u73fe\u5728\u306e\u8981\u7d20\u3068\u5165\u308c\u66ff\u3048\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u3001\u5404\u30ce\u30fc\u30c9\u306b\u304a\u3044\u3066\u30d2\u30fc\u30d7\u306e\u6027\u8cea\u304c\u6e80\u305f\u3055\u308c\u308b\u307e\u3067\u7e70\u308a\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\u30d2\u30fc\u30d7\u30bd\u30fc\u30c8\u3092\u884c\u3046\u305f\u3081\u306b\u3001\u30eb\u30fc\u30c8\u304b\u3089\u8449\u307e\u3067\u4e0b\u3078\u79fb\u52d5\u3057\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u3053\u308c\u306f\u300c\u30c0\u30a6\u30f3\u30d2\u30fc\u30d7\u30bd\u30fc\u30c8\u300d\u3068\u3082\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3082\u3046\u4e00\u3064\u306e\u8208\u5473\u6df1\u3044\u70b9\u306f\u3001\u30c0\u30a6\u30f3\u30d2\u30fc\u30d7\u30d5\u30a1\u30a4\u3092\u975e\u8449\u30ce\u30fc\u30c9\u306e\u307f\u306b\u5b9f\u884c\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n
\u30c0\u30a6\u30f3\u30d2\u30fc\u30d7\u95a2\u6570\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n
 private<\/span> void<\/span> downHeapify<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n\r\n\/\/checking if the node is a leaf node <\/span>\r\n            if<\/span> (<\/span>pos >=<\/span> (<\/span>size \/<\/span> 2<\/span>)<\/span> &&<\/span> pos <=<\/span> size)<\/span>\r\n                return<\/span>;<\/span>\r\n\r\n\/\/checking if a swap is needed<\/span>\r\n            if<\/span> (<\/span>Heap<\/span>[<\/span>pos]<\/span> <<\/span> Heap<\/span>[<\/span>leftChild<\/span>(<\/span>pos)<\/span>]<\/span> ||<\/span>\r\n                    Heap<\/span>[<\/span>pos]<\/span> <<\/span> Heap<\/span>[<\/span>rightChild<\/span>(<\/span>pos)<\/span>]<\/span>)<\/span> {<\/span>\r\n\r\n\/\/replacing parent with maximum of left and right child <\/span>\r\n                if<\/span> (<\/span>Heap<\/span>[<\/span>leftChild<\/span>(<\/span>pos)<\/span>]<\/span> ><\/span> Heap<\/span>[<\/span>rightChild<\/span>(<\/span>pos)<\/span>]<\/span>)<\/span> {<\/span>\r\n                    swap<\/span>(<\/span>pos,<\/span> leftChild<\/span>(<\/span>pos)<\/span>)<\/span>;<\/span>\r\n\r\n\/\/after swaping, heapify is called on the children <\/span>\r\n                    downHeapify<\/span>(<\/span>leftChild<\/span>(<\/span>pos)<\/span>)<\/span>;<\/span>\r\n                }<\/span> else<\/span> {<\/span>\r\n\r\n                   swap<\/span>(<\/span>pos,<\/span> rightChild<\/span>(<\/span>pos)<\/span>)<\/span>;<\/span>\r\n\/\/after swaping, heapify is called on the children <\/span>\r\n                    downHeapify<\/span>(<\/span>rightChild<\/span>(<\/span>pos)<\/span>)<\/span>;<\/span>\r\n                }<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n<\/code><\/pre>\n
\u30b9\u30ef\u30c3\u30d7\u95a2\u6570\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
   private<\/span> void<\/span> swap<\/span>(<\/span>int<\/span> fpos,<\/span> int<\/span> spos)<\/span> {<\/span>\r\n            int<\/span> tmp;<\/span>\r\n            tmp =<\/span> Heap<\/span>[<\/span>fpos]<\/span>;<\/span>\r\n            Heap<\/span>[<\/span>fpos]<\/span> =<\/span> Heap<\/span>[<\/span>spos]<\/span>;<\/span>\r\n            Heap<\/span>[<\/span>spos]<\/span> =<\/span> tmp;<\/span>\r\n        }<\/span>\r\n<\/code><\/pre>\n
\u518d\u5e30\u3067\u306f\u306a\u304f\u3001while\u30eb\u30fc\u30d7\u3092\u4f7f\u3063\u3066\u540c\u3058\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u30c0\u30a6\u30f3\u30d2\u30fc\u30d7\u6cd5\u3067\u306f\u3001\u79c1\u305f\u3061\u306f\u89aa\u304b\u3089\u5b50\u3078\u3068\u79fb\u52d5\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u540c\u69d8\u306b\u3001\u30dc\u30c8\u30e0\u30a2\u30c3\u30d7\u306e\u65b9\u6cd5\u3067\u3082\u79fb\u52d5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30dc\u30c8\u30e0\u30a2\u30c3\u30d7\u306e\u65b9\u6cd5\u3067\u79fb\u52d5\u3059\u308b\u3068\u304d\u306f\u3001\u30ce\u30fc\u30c9\u3092\u305d\u306e\u89aa\u3068\u6bd4\u8f03\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u30a2\u30c3\u30d7\u30d2\u30fc\u30d7\u6cd5\u3068\u547c\u3070\u308c\u307e\u3059\u3002<\/p>\n
\u30a2\u30c3\u30d7\u30d2\u30fc\u30d7\u5316\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
  private<\/span> void<\/span> heapifyUp<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n            int<\/span> temp =<\/span> Heap<\/span>[<\/span>pos]<\/span>;<\/span>\r\n            while<\/span>(<\/span>pos><\/span>0<\/span> &&<\/span> temp ><\/span> Heap<\/span>[<\/span>parent<\/span>(<\/span>pos)<\/span>]<\/span>)<\/span>{<\/span>\r\n                Heap<\/span>[<\/span>pos]<\/span> =<\/span> Heap<\/span>[<\/span>parent<\/span>(<\/span>pos)<\/span>]<\/span>;<\/span>\r\n                pos =<\/span> parent<\/span>(<\/span>pos)<\/span>;<\/span>\r\n            }<\/span>\r\n            Heap<\/span>[<\/span>pos]<\/span> =<\/span> temp;<\/span>\r\n        }<\/span>\r\n\r\n<\/code><\/pre>\n
\u79c1\u305f\u3061\u306f\u518d\u5e30\u306e\u4ee3\u308f\u308a\u306b\u3001while\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066up_heapify\u306e\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u307e\u3057\u305f\u3002<\/p>\n
4. \u65b0\u3057\u3044\u30ce\u30fc\u30c9\u3092\u633f\u5165\u3057\u307e\u3059\u3002 (Atarashii nod\u014d o s\u014dny\u016b shimasu.)<\/h3>\n
\u914d\u5217\u306e\u672b\u5c3e\u306b\u65b0\u3057\u3044\u8981\u7d20\u304c\u8ffd\u52a0\u3055\u308c\u3001\u30d2\u30fc\u30d7\u306e\u7279\u6027\u304c\u4fdd\u6301\u3055\u308c\u308b\u3088\u3046\u306b\u30b9\u30ef\u30c3\u30d7\u304c\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n
\u633f\u5165\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
    \n
  1. \n
      \u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\u3092\u5897\u3084\u3059<\/ol>\n<\/li>\n<\/ol>\n
       <\/p>\n
        \n
      1. \n
          \u65b0\u3057\u3044\u8981\u7d20\u3092\u30d2\u30fc\u30d7\u306e\u6700\u5f8c\u306b\u7f6e\u304f<\/ol>\n<\/li>\n<\/ol>\n
           <\/p>\n
            \u4e0b\u304b\u3089\u4e0a\u3078\u30d2\u30fc\u30d7\u5316\u3059\u308b<\/ol>\n
            \u633f\u5165\u306e\u305f\u3081\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n
             public<\/span> void<\/span> insert<\/span>(<\/span>int<\/span> element)<\/span> {<\/span>\r\n            Heap<\/span>[<\/span>++<\/span>size]<\/span> =<\/span> element;<\/span> \r\n            int<\/span> current =<\/span> size;<\/span>\r\n            heapifyUp<\/span>(<\/span>current)<\/span>;<\/span>\r\n        }<\/span>\r\n<\/code><\/pre>\n
            5. \u30ce\u30fc\u30c9\u306e\u524a\u9664\/\u62bd\u51fa<\/h3>\n
            \u30d2\u30fc\u30d7\u304b\u3089\u30ce\u30fc\u30c9\u3092\u524a\u9664\uff0f\u62bd\u51fa\u3059\u308b\u305f\u3081\u306b\u3001\u30eb\u30fc\u30c8\u304b\u3089\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u30eb\u30fc\u30c8\u306f\u5e38\u306b\u6700\u5927\u306e\u8981\u7d20\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
            \u524a\u9664\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
              \n
            1. \n
                \u6700\u521d\u306e\u8981\u7d20\u3092\u5909\u6570\u306b\u30b3\u30d4\u30fc\u3059\u308b\u3002<\/ol>\n<\/li>\n<\/ol>\n
                 <\/p>\n
                  \n
                1. \n
                    \u6700\u5f8c\u306e\u8981\u7d20\u3092\u6700\u521d\u306e\u4f4d\u7f6e\uff08\u30eb\u30fc\u30c8\uff09\u306b\u30b3\u30d4\u30fc\u3059\u308b\u3002<\/ol>\n<\/li>\n<\/ol>\n
                     <\/p>\n
                      downHeapify() \u3092\u547c\u3073\u51fa\u3059\u3002<\/ol>\n
                      \u524a\u9664\u306e\u305f\u3081\u306e\u30b3\u30fc\u30c9\u306f\uff1a<\/p>\n
                        public<\/span> int<\/span> extractMax<\/span>(<\/span>)<\/span> {<\/span>\r\n            int<\/span> max =<\/span> Heap<\/span>[<\/span>1<\/span>]<\/span>;<\/span>\r\n            Heap<\/span>[<\/span>1<\/span>]<\/span> =<\/span> Heap<\/span>[<\/span>size--<\/span>]<\/span>;<\/span>\r\n            downHeapify<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\r\n            return<\/span> max;<\/span>\r\n        }<\/span>\r\n<\/code><\/pre>\n
                      \u3053\u3053\u3067\u306f\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u3059\u308b\u305f\u3081\u306b\u3001\u30b5\u30a4\u30ba\u2212\u2212\u3092\u4f7f\u7528\u3057\u3066\u30d2\u30fc\u30d7\u306e\u30b5\u30a4\u30ba\u3092\u6e1b\u3089\u3057\u307e\u3059\u3002<\/p>\n
                      Java\u3067\u306eMax Heap\u306e\u5b8c\u5168\u5b9f\u88c5<\/h2>\n
                      \u5b8c\u5168\u306aJava\u5b9f\u88c5\u306eMax Heap\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
                      package<\/span> com.<\/span><\/span>JournalDev<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n    static<\/span> class<\/span> MaxHeap<\/span> {<\/span>\r\n        private<\/span> int<\/span>[<\/span>]<\/span> Heap<\/span>;<\/span>\r\n        private<\/span> int<\/span> size;<\/span>\r\n        private<\/span> int<\/span> maxsize;<\/span>\r\n\r\n        public<\/span> MaxHeap<\/span>(<\/span>int<\/span> size)<\/span> {<\/span>\r\n            this<\/span>.<\/span>maxsize =<\/span> size;<\/span>\r\n            this<\/span>.<\/span>size =<\/span> 0<\/span>;<\/span>\r\n            Heap<\/span> =<\/span> new<\/span> int<\/span>[<\/span>this<\/span>.<\/span>maxsize +<\/span> 1<\/span>]<\/span>;<\/span>\r\n            Heap<\/span>[<\/span>0<\/span>]<\/span> =<\/span> Integer<\/span>.<\/span>MAX_VALUE<\/span>;<\/span>\r\n        }<\/span>\r\n\r\n        private<\/span> int<\/span> parent<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n            return<\/span> pos \/<\/span> 2<\/span>;<\/span>\r\n        }<\/span>\r\n\r\n        private<\/span> int<\/span> leftChild<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n            return<\/span> (<\/span>2<\/span> *<\/span> pos)<\/span>  ;<\/span>\r\n        }<\/span>\r\n\r\n        private<\/span> int<\/span> rightChild<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n            return<\/span> (<\/span>2<\/span> *<\/span> pos)<\/span> +<\/span> 1<\/span>;<\/span>\r\n        }<\/span>\r\n\r\n\r\n        private<\/span> void<\/span> swap<\/span>(<\/span>int<\/span> fpos,<\/span> int<\/span> spos)<\/span> {<\/span>\r\n            int<\/span> tmp;<\/span>\r\n            tmp =<\/span> Heap<\/span>[<\/span>fpos]<\/span>;<\/span>\r\n            Heap<\/span>[<\/span>fpos]<\/span> =<\/span> Heap<\/span>[<\/span>spos]<\/span>;<\/span>\r\n            Heap<\/span>[<\/span>spos]<\/span> =<\/span> tmp;<\/span>\r\n        }<\/span>\r\n\r\n        private<\/span> void<\/span> downHeapify<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n            if<\/span> (<\/span>pos >=<\/span> (<\/span>size \/<\/span> 2<\/span>)<\/span> &&<\/span> pos <=<\/span> size)<\/span>\r\n                return<\/span>;<\/span>\r\n\r\n            if<\/span> (<\/span>Heap<\/span>[<\/span>pos]<\/span> <<\/span> Heap<\/span>[<\/span>leftChild<\/span>(<\/span>pos)<\/span>]<\/span> ||<\/span>\r\n                    Heap<\/span>[<\/span>pos]<\/span> <<\/span> Heap<\/span>[<\/span>rightChild<\/span>(<\/span>pos)<\/span>]<\/span>)<\/span> {<\/span>\r\n\r\n                if<\/span> (<\/span>Heap<\/span>[<\/span>leftChild<\/span>(<\/span>pos)<\/span>]<\/span> ><\/span> Heap<\/span>[<\/span>rightChild<\/span>(<\/span>pos)<\/span>]<\/span>)<\/span> {<\/span>\r\n                    swap<\/span>(<\/span>pos,<\/span> leftChild<\/span>(<\/span>pos)<\/span>)<\/span>;<\/span>\r\n                    downHeapify<\/span>(<\/span>leftChild<\/span>(<\/span>pos)<\/span>)<\/span>;<\/span>\r\n                }<\/span> else<\/span> {<\/span>\r\n                    swap<\/span>(<\/span>pos,<\/span> rightChild<\/span>(<\/span>pos)<\/span>)<\/span>;<\/span>\r\n                    downHeapify<\/span>(<\/span>rightChild<\/span>(<\/span>pos)<\/span>)<\/span>;<\/span>\r\n                }<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n        private<\/span> void<\/span> heapifyUp<\/span>(<\/span>int<\/span> pos)<\/span> {<\/span>\r\n            int<\/span> temp =<\/span> Heap<\/span>[<\/span>pos]<\/span>;<\/span>\r\n            while<\/span>(<\/span>pos><\/span>0<\/span> &&<\/span> temp ><\/span> Heap<\/span>[<\/span>parent<\/span>(<\/span>pos)<\/span>]<\/span>)<\/span>{<\/span>\r\n                Heap<\/span>[<\/span>pos]<\/span> =<\/span> Heap<\/span>[<\/span>parent<\/span>(<\/span>pos)<\/span>]<\/span>;<\/span>\r\n                pos =<\/span> parent<\/span>(<\/span>pos)<\/span>;<\/span>\r\n            }<\/span>\r\n            Heap<\/span>[<\/span>pos]<\/span> =<\/span> temp;<\/span>\r\n        }<\/span>\r\n\r\n\r\n        public<\/span> void<\/span> insert<\/span>(<\/span>int<\/span> element)<\/span> {<\/span>\r\n            Heap<\/span>[<\/span>++<\/span>size]<\/span> =<\/span> element;<\/span>\r\n\r\n\r\n            int<\/span> current =<\/span> size;<\/span>\r\n            heapifyUp<\/span>(<\/span>current)<\/span>;<\/span>\r\n\r\n        }<\/span>\r\n\r\n        public<\/span> void<\/span> print<\/span>(<\/span>)<\/span> {<\/span>\r\n            for<\/span> (<\/span>int<\/span> i =<\/span> 1<\/span>;<\/span> i <=<\/span> size \/<\/span> 2<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>\r\n                System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>+<\/span> Heap<\/span>[<\/span>i]<\/span> +<\/span> \": L- \"<\/span> +<\/span>\r\n                        Heap<\/span>[<\/span>2<\/span> *<\/span> i]<\/span> +<\/span> \" R- \"<\/span> +<\/span> Heap<\/span>[<\/span>2<\/span> *<\/span> i +<\/span> 1<\/span>]<\/span>)<\/span>;<\/span>\r\n                System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>)<\/span>;<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n\r\n        public<\/span> int<\/span> extractMax<\/span>(<\/span>)<\/span> {<\/span>\r\n            int<\/span> max =<\/span> Heap<\/span>[<\/span>1<\/span>]<\/span>;<\/span>\r\n            Heap<\/span>[<\/span>1<\/span>]<\/span> =<\/span> Heap<\/span>[<\/span>size--<\/span>]<\/span>;<\/span>\r\n            downHeapify<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\r\n            return<\/span> max;<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> arg)<\/span>\r\n    {<\/span>\r\n      \r\n        MaxHeap<\/span> maxHeap =<\/span> new<\/span> MaxHeap<\/span>(<\/span>15<\/span>)<\/span>;<\/span>\r\n        maxHeap.<\/span>insert<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\r\n        maxHeap.<\/span>insert<\/span>(<\/span>4<\/span>)<\/span>;<\/span>\r\n        maxHeap.<\/span>insert<\/span>(<\/span>2<\/span>)<\/span>;<\/span>\r\n        maxHeap.<\/span>insert<\/span>(<\/span>5<\/span>)<\/span>;<\/span>\r\n        maxHeap.<\/span>insert<\/span>(<\/span>13<\/span>)<\/span>;<\/span>\r\n        maxHeap.<\/span>insert<\/span>(<\/span>6<\/span>)<\/span>;<\/span>\r\n        maxHeap.<\/span>insert<\/span>(<\/span>17<\/span>)<\/span>;<\/span>\r\n\r\n        maxHeap.<\/span>print<\/span>(<\/span>)<\/span>;<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"The max is \"<\/span> +<\/span> maxHeap.<\/span>extractMax<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n}<\/span> \r\n\r\n<\/code><\/pre>\n
                      Output : \r\n\r\n17: L- 5 R- 13\r\n5: L- 1 R- 4\r\n13: L- 2 R- 6\r\nThe max is 17\r\n<\/code><\/pre>\n
                      \u7d50\u8ad6<\/h2>\n
                      \u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306f\u3001Java\u3067\u306eMax\u30d2\u30fc\u30d7\u30c7\u30fc\u30bf\u69cb\u9020\u306b\u3064\u3044\u3066\u3067\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                      \u6700\u5927\u30d2\u30fc\u30d7\u306f\u3001\u3042\u308b\u30ce\u30fc\u30c9\u306e\u5024\u304c\u305d\u306e\u5b50\u30ce\u30fc\u30c9\u306e\u5024\u4ee5\u4e0a\u3067\u3042\u308b\u5b8c\u5168\u4e8c\u5206\u6728\u3067\u3059\u3002\u6700\u5927\u30d2\u30fc\u30d7\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u306f\u3001\u30d2\u30fc\u30d7\u30bd\u30fc\u30c8\u3092\u7528\u3044\u3066\u30c7\u30fc\u30bf\u3092\u30bd\u30fc\u30c8\u3059\u308b\u969b\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002 \u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001Java\u3067\u6700\u5927\u30d2\u30fc\u30d7\u3092\u30b9\u30af\u30e9\u30c3\u30c1\u304b\u3089\u5b9f\u88c5\u3059 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-420","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava\u3067\u306e\u6700\u5927\u30d2\u30fc\u30d7\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u5b9f\u88c5 - 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