{"id":570,"date":"2013-01-05T06:58:52","date_gmt":"2013-01-04T21:58:52","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=570"},"modified":"2013-04-24T21:55:47","modified_gmt":"2013-04-24T12:55:47","slug":"n%e3%82%af%e3%82%a4%e3%83%bc%e3%83%b3%e5%95%8f%e9%a1%8c-nqueens-problem","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=570","title":{"rendered":"N\u30af\u30a4\u30fc\u30f3\u554f\u984c nQueens Problem"},"content":{"rendered":"<p>Java \u3067 N\u30af\u30a4\u30fc\u30f3\u554f\u984c \u3000nQueens Problem \u3092\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<p>\u307e\u305a N\u30af\u30a4\u30fc\u30f3\u554f\u984c\u3068\u306f\u4f55\u304b\uff1f<\/p>\n<p>\u30cd\u30c3\u30c8\u3067\u30b0\u30b0\u3063\u3066\u307f\u308b\u3068\uff18\u30af\u30a4\u30fc\u30f3\u554f\u984c\u3063\u3066\u306e\u304c\u3088\u304f\u3068\u308a\u3042\u3052\u3089\u308c\u3066\u307e\u3059\u3002<\/p>\n<p>N\u30af\u30a4\u30fc\u30f3\u554f\u984c\u3068\u306f\u305d\u308c\u3092\u4e00\u822c\u5316\u3057\u305f\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>\u3067\u306f\uff18\u30af\u30a4\u30fc\u30f3\u554f\u984c\u304b\u3089\u8abf\u3079\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\uff18\u30af\u30a4\u30fc\u30f3\u554f\u984c\u3067\u306f\u3001\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\uff18\u500b\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30c1\u30a7\u30b9\u76e4\u306e\u30b5\u30a4\u30ba\u306f\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u3068\u540c\u3058\u6570\u3068\u3057\u307e\u3059\u3002<\/p>\n<p>\uff18\u30af\u30a4\u30fc\u30f3\u3067\u306f\u7e26\u3001\u6a2a\uff18\u30de\u30b9\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u30c1\u30a7\u30b9\u76e4\u306b\u5168\u3066\u306e\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u3092\u914d\u7f6e\u3057\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u306e\u5229\u304d\u7b4b\u306b\u306f\u914d\u7f6e\u3067\u304d\u307e\u305b\u3093\u3002\uff08\u7e26\u3001\u6a2a\u3001\u659c\u3081\u306e\uff14\u30e9\u30a4\u30f3\uff09<\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/bord_n.png\"><img loading=\"lazy\" decoding=\"async\" title=\"bord_n\" style=\"border-left-width: 0px; border-right-width: 0px; background-image: none; border-bottom-width: 0px; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border-top-width: 0px\" border=\"0\" alt=\"bord_n\" src=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/bord_n_thumb.png\" width=\"468\" height=\"467\"><\/a><\/p>\n<p>\u4ee5\u4e0a\u306e\u6761\u4ef6\u3092\u5168\u3066\u6e80\u305f\u3059\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u306e\u914d\u7f6e\u30d1\u30bf\u30fc\u30f3\u53ca\u3073\u7dcf\u6570\u3092\u6c42\u3081\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3069\u3046\u3084\u3063\u3066\u89e3\u3092\u5c0e\u304d\u51fa\u3057\u305f\u3089\u3044\u3044\u306e\u304b\u8003\u3048\u3066\u307f\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\uff18\u500b\u306e\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u3092\u5168\u3066\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u914d\u7f6e\u3057\u3066\u4e0a\u8a18\u306e\u6761\u4ef6\u3092\u30af\u30ea\u30a2\u3059\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308c\u3070\u3044\u3044\u3060\u3051\u306e\u3053\u3068\u3067\u3059\u306d\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u305d\u306e\u65b9\u6cd5\u3060\u3068 8 X 8 = 64 \u30de\u30b9\u3042\u308b\u304b\u3089<\/p>\n<p>64 X 63 X 62 X 61 X 60 X 59 X 58 X 57 = 178,462,987,637,760 \u901a\u308a\u3082\u3042\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3061\u3087\u3063\u3068\u591a\u3044\u3067\u3059\u306d\u3002<\/p>\n<p>\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u306e\u6570\u304c\u5927\u304d\u304f\u306a\u3063\u305f\u6642\u306e\u3053\u3068\u3092\u8003\u3048\u305f\u3089\u53b3\u3057\u3044\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u5168\u3066\u306e\u7d44\u307f\u5408\u308f\u305b\u3092\u8abf\u3079\u308b\u5fc5\u8981\u306f\u306a\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n<p>\u4f55\u6545\u306a\u3089\u3001\u540c\u3058\u5217\u3001\u884c\u306b\u738b\u5983\u306f\u914d\u7f6e\u3067\u304d\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u7e26\u3001\u6a2a\u306e\u5229\u304d\u7b4b\u306e\u6761\u4ef6\u3092\u8003\u616e\u3057\u305f\u7d50\u679c\u3001\u5404\u5217\u3001\u884c\u306b\u306f\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u306f 1 \u500b\u3060\u3051\u3057\u304b\u914d\u7f6e\u3067\u304d\u306a\u3044\uff01<\/p>\n<p>\u3088\u3063\u3066\u3001 8! = 40,320 \u901a\u308a\u307e\u3067\u6fc0\u6e1b\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n<p>\u3042\u3068\u659c\u3081\u306e\u5229\u304d\u7b4b\uff12\u3064\u3092\u5229\u7528\u3059\u308c\u3070\u8a08\u7b97\u51e6\u7406\u306f\u3082\u3063\u3068\u5c11\u306a\u304f\u306a\u308b\u3060\u308d\u3046\u3002<\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/bord_d_pos.jpg\"><img loading=\"lazy\" decoding=\"async\" title=\"bord_d_pos\" style=\"border-left-width: 0px; border-right-width: 0px; background-image: none; border-bottom-width: 0px; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border-top-width: 0px\" border=\"0\" alt=\"bord_d_pos\" src=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/bord_d_pos_thumb.jpg\" width=\"468\" height=\"467\"><\/a>&nbsp; <\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/bord_d_neg.jpg\"><img loading=\"lazy\" decoding=\"async\" title=\"bord_d_neg\" style=\"border-left-width: 0px; border-right-width: 0px; background-image: none; border-bottom-width: 0px; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border-top-width: 0px\" border=\"0\" alt=\"bord_d_neg\" src=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/bord_d_neg_thumb.jpg\" width=\"468\" height=\"467\"><\/a><\/p>\n<p>\u4ee5\u4e0a\u306e\u3053\u3068\u3092\u8003\u616e\u3057\u305f\u4e0a\u3067\u6b21\u306e\u3088\u3046\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308c\u3070\u3044\u3044\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">private static void trySet(int i) {<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp; for (\u738b\u5983\u306e\u6570\u3060\u3051\u30eb\u30fc\u30d7) {<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (\u5229\u304d\u7b4b\u304b\u3089\u5916\u308c\u3066\u3044\u308c\u3070) {<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \u738b\u5983 i \u5217 j \u884c\u306b\u914d\u7f6e<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (i == (\u738b\u5983\uff18\u500b\u914d\u7f6e\u3067\u304d\u305f\u3089) { <\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \u30c8\u30fc\u30bf\u30eb\u30d1\u30bf\u30fc\u30f3\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \u76e4\u9762\u3092\u8868\u793a<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }else {<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \u738b\u5983\u306e\u5229\u304d\u7b4b\uff08\u884c\u3001\u659c\u3081\uff09\u3092\u30bb\u30c3\u30c8<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \u6b21\u306e\u5217\u3092\u914d\u7f6e\uff08\u518d\u5e30 trySet(i + 1)\uff09<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \u738b\u5983\u306e\u5229\u304d\u7b4b\uff08\u884c\u3001\u659c\u3081\uff09\u3092\u89e3\u9664<\/font><\/p>\n<p><font size=\"3\" face=\"\u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br \/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br \/>&nbsp;&nbsp;&nbsp;&nbsp; }<br \/>}<\/font><\/p>\n<p>&nbsp;<\/p>\n<p>\u3063\u3066\u3053\u3068\u3067\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<p>\u305f\u3060\u3001\u30c7\u30d0\u30c3\u30ac\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u6d41\u308c\u3092\u8ffd\u3046\u305f\u3081\u306b\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u306e\u6570\u306f 4 \u3068\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u3082\u3061\u308d\u3093\u3001\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u306e\u6570\u306f\u4e00\u822c\u5316\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<style type=\"text\/css\">\n<!--\ntable {color: #000000; background-color: #e9e8e2; font-family: \u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09}\n-->\n<\/style>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"left\"><font size=\"4\">nqueensproblem.NQueensProblem.java<\/font><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage nqueensproblem;\r\n\r\n\/**\r\n *\r\n * @author Yucchi\r\n *\/\r\npublic class NQueensProblem {\r\n\r\n    \/\/ \u738b\u5983\u6570\r\n    private static final int QUEENS = 4;\r\n    \/\/ \u738b\u5983\u306e\u914d\u7f6e\u4f4d\u7f6e \r\n    private static final int [] VERTICAL = new int [QUEENS];\r\n    \/\/ \u884c\u306b\u738b\u5983\u304c\u914d\u7f6e\u3055\u308c\u3066\u308b\u304b\u30c1\u30a7\u30c3\u30af\u7528  \r\n    private static final boolean [] HORIZONTAL = new boolean [QUEENS]; \r\n    \/\/ \u53f3\uff14\uff15\u5ea6\u659c\u3081\u30e9\u30a4\u30f3\u306b\u738b\u5983\u304c\u914d\u7f6e\u3055\u308c\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u7528\r\n    private static final boolean [] DIP_POSITIVE = new boolean [QUEENS * 2 -1]; \r\n    \/\/ \u5de6\uff14\uff15\u5ea6\u659c\u3081\u30e9\u30a4\u30f3\u306b\u738b\u5983\u304c\u914d\u7f6e\u3055\u308c\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u7528\r\n    private static final boolean [] DIP_NEGATIVE = new boolean [QUEENS * 2 - 1];\r\n    \/\/ \u5b89\u5168 \r\n    private static final boolean SAFE = false;\r\n    \/\/ \u5371\u967a \r\n    private static final boolean OUT = true;\r\n    \/\/ \u30c8\u30fc\u30bf\u30eb\u30d1\u30bf\u30fc\u30f3\u6570 \r\n    private static int counter; \r\n\r\n    public static void main(String[] args) {\r\n        trySet(0);\r\n        if(counter < 1){\r\n            System.out.println(\"\u914d\u7f6e\u4e0d\u53ef\u80fd\u3067\u3057\u305f\u3002\");\r\n        }else{\r\n            System.out.println(counter + \" \u30d1\u30bf\u30fc\u30f3\u914d\u7f6e\u53ef\u80fd\u3067\u3057\u305f\u3002\");\r\n        }\r\n    }\r\n    \r\n    \/\/ \u5168\u3066\u306e\u53ef\u80fd\u306a\u738b\u5983\u306e\u914d\u7f6e\u4f4d\u7f6e\u3092\u53d6\u5f97\u3001\u305d\u3057\u3066\u30c8\u30fc\u30bf\u30eb\u30d1\u30bf\u30fc\u30f3\u6570\u3082\u53d6\u5f97\u3059\u308b\u3002\r\n    private static void trySet(int i) {\r\n        for (int j = 0; j < QUEENS; j++) {\r\n            \/\/ \u884c ( j )\u3001\uff0f\u53f3\uff14\uff15\u5ea6\u659c\u3081\u30e9\u30a4\u30f3 ( i + j )\u3001\uff3c\u5de6\uff14\uff15\u5ea6\u659c\u3081\u30e9\u30a4\u30f3 (i - j + ( QUEENS -1 )) \u914d\u7f6e\u30c1\u30a7\u30c3\u30af\r\n         if (HORIZONTAL [j] == SAFE &#038;&#038; DIP_POSITIVE [i + j] == SAFE &#038;&#038; DIP_NEGATIVE [i - j + ( QUEENS -1)] == SAFE) { \r\n            VERTICAL [i] = j; \/\/ \u738b\u5983 i \u5217 j \u884c\u306b\u914d\u7f6e\r\n            if (i == ( QUEENS -1)) { \/\/ \u738b\u5983\u306e\u914d\u7f6e\u5b8c\u4e86\r\n                 counter++; \/\/ \u30c8\u30fc\u30bf\u30eb\u30d1\u30bf\u30fc\u30f3\u6570\u30ab\u30a6\u30f3\u30bf\u30fc\r\n                 printBoard(); \/\/ \u76e4\u9762\u3092\u8868\u793a\r\n             }else {\r\n                \/\/ \u738b\u5983\u306e\u5229\u304d\u7b4b\uff08\u884c\u3001\u659c\u3081\uff09\u3092\u30bb\u30c3\u30c8\r\n               HORIZONTAL [j] = DIP_POSITIVE [i + j] = DIP_NEGATIVE [i - j + ( QUEENS -1)] = OUT;\r\n               \/\/ \u6b21\u306e\u5217\u3092\u914d\u7f6e\r\n               trySet(i + 1);\r\n               \/\/ \u738b\u5983\u306e\u5229\u304d\u7b4b\uff08\u884c\u3001\u659c\u3081\uff09\u3092\u89e3\u9664\r\n               HORIZONTAL [j] = DIP_POSITIVE [i + j] = DIP_NEGATIVE [i - j + ( QUEENS -1)] = SAFE;\r\n            }\r\n         }\r\n      }\r\n    }\r\n\r\n    \/\/ \u5168\u3066\u306e\u53ef\u80fd\u306a\u738b\u4f4d\u914d\u7f6e\u4f4d\u7f6e\u3092\u51fa\u529b\u3000\u25cf\u304c\u738b\u5983\u304c\u7f6e\u304b\u308c\u305f\u5834\u6240\u3067\u3042\u308b\u3002\r\n    private static void printBoard() {\r\n        System.out.println(\"\u7b2c \" + counter + \" \u30d1\u30bf\u30fc\u30f3\"); \r\n        for (int i = 0; i < QUEENS; i++) {\r\n         for (int j = 0; j < QUEENS; j++) {\r\n                System.out.printf(\"%s\", j == VERTICAL [i] ? \"\u25cf \" : \"\u25a1 \");\r\n            }\r\n         System.out.println();\r\n      }\r\n      System.out.println();\r\n\r\n    }\r\n}\r\n<\/pre>\n<p>&nbsp;<\/p>\n<p>\u3055\u3066\u3001\u7406\u5c48\u3084\u30b3\u30fc\u30c9\u3060\u3051\u3067\u306f\u89e3\u308a\u306b\u304f\u3044\u304b\u3082\u3057\u308c\u306a\u3044\u306e\u3067\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u6d41\u308c\u3092\u30c7\u30d0\u30c3\u30b0\u5b9f\u884c\u3057\u3066\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>\u30c7\u30d0\u30c3\u30b0\u30a6\u30a3\u30f3\u30c9\u30a6\u3084\u30a6\u30a9\u30c3\u30c1\u30dd\u30a4\u30f3\u30c8\u306e\u5909\u6570\u306e\u5024\u3092\u78ba\u8a8d\u3057\u306a\u304c\u3089\u3054\u3089\u3093\u304f\u3060\u3055\u3044\u307e\u305b\u3002<\/p>\n<p>&nbsp;<\/p>\n<p><video controls height=\"507\" width=\"900\"><source type=\"video\/mp4\" src=\"http:\/\/yucchi.jp\/movie\/n_queens\/n_queens_low.mp4\">\u3042\u306a\u305f\u304c\u3054\u5229\u7528\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u306f\u518d\u751f\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/video><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/n1.png\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" title=\"n1\" style=\"border-left-width: 0px; border-right-width: 0px; background-image: none; border-bottom-width: 0px; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border-top-width: 0px\" border=\"0\" alt=\"n1\" src=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/n1_thumb.png\" width=\"644\" height=\"328\"><\/a><\/p>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u6d41\u308c\u3092\u898b\u3066\u3044\u308b\u3068\u4eba\u9593\u306e\u601d\u8003\u539f\u7406\u306b\u975e\u5e38\u306b\u826f\u304f\u4f3c\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n<p>\u3068\u308a\u3042\u3048\u305a\u9806\u756a\u306b\u8a66\u3057\u3066\u307f\u308b\u3002<\/p>\n<p>\u6761\u4ef6\u3092\u8003\u616e\u3057\u3066\u7121\u99c4\u306a\u3053\u3068\u306f\u305b\u305a\u4f5c\u696d\u91cf\u3092\u6e1b\u3089\u3059\u3002<\/p>\n<p>\u9014\u4e2d\u3067\u99c4\u76ee\u3060\u3068\u5224\u65ad\u3067\u304d\u305f\u3089\u623b\u3063\u3066\u6b21\u306e\u30d1\u30bf\u30fc\u30f3\u304b\u3089\u3084\u308a\u76f4\u3059\u3002<\/p>\n<p>\u305d\u308c\u306e\u7e70\u308a\u8fd4\u3057\u3067\u51e6\u7406\u3092\u5b8c\u4e86\u3059\u308b\u3002<\/p>\n<p>\u3053\u3046\u3044\u3063\u305f\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u30d0\u30c3\u30af\u30c8\u30e9\u30c3\u30af\u6cd5\u3063\u3066\u8a00\u308f\u308c\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>\u6df1\u3055\u512a\u5148\u63a2\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u3059\u306d\u3002<\/p>\n<p>\u8a66\u884c\u932f\u8aa4\u7684\u306b\u89e3\u3092\u63a2\u3057\u51fa\u3059\u30bf\u30a4\u30d7\u306e\u554f\u984c\u306b\u6709\u52b9\u3067\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u57fa\u672c\u7684\u306b\u5168\u3066\u306e\u9078\u629e\u80a2\u3092\u8a66\u3057\u3066\u307f\u308b\u3057\u304b\u7121\u3044\u5834\u5408\u306a\u3093\u304b\u306b\u306f\u6709\u52b9\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>\u3044\u3064\u9803\u3001\u8ab0\u304c\u3001\u3069\u306e\u3088\u3046\u306a\u7406\u7531\u3067\u3053\u3046\u3044\u3063\u305f\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u8003\u3048\u305f\u306e\u304b\uff1f<\/p>\n<p>\u8003\u3048\u305f\u4eba\u3092\u5fc3\u304b\u3089\u5c0a\u656c\u3057\u307e\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b \uff18\u738b\u5983\u554f\u984c\u3068\u3057\u3066\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408\u306f\u4e0a\u8a18\u30d7\u30ed\u30b0\u30e9\u30e0\u306e 9 \u884c\u76ee\u306e<\/p>\n<p>private static final int QUEENS = 4; \/\/ \u738b\u5983\u6570<\/p>\n<p>\u738b\u5983\u6570\u3092 8 \u306b\u5909\u66f4\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u4efb\u610f\u306e\u738b\u5983\u6570\u3092\u3053\u308c\u306b\u3088\u3063\u3066\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u304c\u3042\u307e\u308a\u738b\u5983\u6570\u3092\u5927\u304d\u304f\u3059\u308b\u3068\u8a08\u7b97\u91cf\u304c\u6307\u6570\u95a2\u6570\u7684\u306b\u5897\u52a0\u3059\u308b\u3067\u3057\u3087\u3046\u304b\u3089\u307b\u3069\u307b\u3069\u306b(^_^;<\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/a_0012.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" title=\"a_001\" style=\"border-left-width: 0px; border-right-width: 0px; background-image: none; border-bottom-width: 0px; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border-top-width: 0px\" border=\"0\" alt=\"a_001\" src=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2013\/01\/a_001_thumb2.jpg\" width=\"904\" height=\"626\"><\/a><\/p>\n<p>\u518d\u5e30\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u3067\u7c21\u5358\u306a\u899a\u3048\u66f8\u304d\u3092\u6b8b\u3057\u3066\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/?p=538\">\u518d\u5e30\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3000\u305d\u306e\uff11<\/a><\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/?p=544\" target=\"_blank\">\u518d\u5e30\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3000\u305d\u306e\uff12<\/a><\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/?p=550\">\u30e6\u30fc\u30af\u30ea\u30c3\u30c9\u306e\u4e92\u9664\u6cd5 Euclidean Algorithm<\/a><\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/?p=557\">\u30cf\u30ce\u30a4\u306e\u5854 Tower of Hanoi<\/a><\/p>\n<div id=\"scid:0767317B-992E-4b12-91E0-4F059A8CECA8:622135d8-4ee8-4601-89f7-7b160434b744\" class=\"wlWriterEditableSmartContent\" style=\"float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px\">Hatena \u30bf\u30b0: <a href=\"http:\/\/b.hatena.ne.jp\/t\/Java\" rel=\"tag\">Java<\/a><\/div>\n<div class='wp_social_bookmarking_light'>\n            <div class=\"wsbl_hatena\"><a href='\/\/b.hatena.ne.jp\/add?mode=confirm&url=http%3A%2F%2Fyucchi.jp%2Fblog%2F%3Fp%3D570&title=N%E3%82%AF%E3%82%A4%E3%83%BC%E3%83%B3%E5%95%8F%E9%A1%8C%20nQueens%20Problem' title='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' rel=nofollow class='wp_social_bookmarking_light_a' target=_blank><img src='http:\/\/yucchi.jp\/blog\/wp-content\/plugins\/wp-social-bookmarking-light\/public\/images\/hatena.gif' alt='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' title='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' width='16' height='12' class='wp_social_bookmarking_light_img' \/><\/a><\/div>\n            <div class=\"wsbl_facebook\"><a href='http:\/\/www.facebook.com\/share.php?u=http%3A%2F%2Fyucchi.jp%2Fblog%2F%3Fp%3D570&t=N%E3%82%AF%E3%82%A4%E3%83%BC%E3%83%B3%E5%95%8F%E9%A1%8C%20nQueens%20Problem' title='Facebook \u306b\u30b7\u30a7\u30a2' rel=nofollow class='wp_social_bookmarking_light_a' target=_blank><img src='http:\/\/yucchi.jp\/blog\/wp-content\/plugins\/wp-social-bookmarking-light\/public\/images\/facebook.png' alt='Facebook \u306b\u30b7\u30a7\u30a2' title='Facebook \u306b\u30b7\u30a7\u30a2' width='16' height='16' class='wp_social_bookmarking_light_img' \/><\/a><\/div>\n            <div class=\"wsbl_google_plus_one\"><g:plusone size=\"medium\" annotation=\"none\" href=\"http:\/\/yucchi.jp\/blog\/?p=570\" ><\/g:plusone><\/div>\n            <div class=\"wsbl_twitter\"><a href=\"https:\/\/twitter.com\/share\" class=\"twitter-share-button\" data-url=\"http:\/\/yucchi.jp\/blog\/?p=570\" data-text=\"N\u30af\u30a4\u30fc\u30f3\u554f\u984c nQueens Problem\" data-lang=\"ja\">Tweet<\/a><\/div>\n    <\/div>\n<br class='wp_social_bookmarking_light_clear' \/>\n","protected":false},"excerpt":{"rendered":"<p>Java \u3067 N\u30af\u30a4\u30fc\u30f3\u554f\u984c \u3000nQueens Problem \u3092\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3057\u3066\u307f\u307e\u3057\u305f\u3002 \u307e\u305a N\u30af\u30a4\u30fc\u30f3\u554f\u984c\u3068\u306f\u4f55\u304b\uff1f \u30cd\u30c3\u30c8\u3067\u30b0\u30b0\u3063\u3066\u307f\u308b\u3068\uff18\u30af\u30a4\u30fc\u30f3\u554f\u984c\u3063\u3066\u306e\u304c\u3088\u304f\u3068\u308a\u3042\u3052\u3089\u308c\u3066\u307e\u3059\u3002 N\u30af\u30a4\u30fc\u30f3\u554f\u984c\u3068\u306f\u305d\u308c\u3092\u4e00\u822c\u5316\u3057\u305f\u3088\u3046\u3067\u3059\u3002 \u3067\u306f\uff18\u30af\u30a4\u30fc\u30f3\u554f\u984c\u304b\u3089\u8abf\u3079\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002 \uff18\u30af\u30a4\u30fc\u30f3\u554f\u984c\u3067\u306f\u3001\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\uff18\u500b\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002 \u30c1\u30a7\u30b9\u76e4\u306e\u30b5\u30a4\u30ba\u306f\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u3068\u540c\u3058\u6570\u3068\u3057\u307e\u3059\u3002 \uff18\u30af\u30a4\u30fc\u30f3\u3067\u306f\u7e26\u3001\u6a2a\uff18\u30de\u30b9\u3067\u3059\u3002 \u305d\u306e\u30c1\u30a7\u30b9\u76e4\u306b\u5168\u3066\u306e\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u3092\u914d\u7f6e\u3057\u307e\u3059\u3002 \u305f\u3060\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u738b\u5983\uff08\u30af\u30a4\u30fc\u30f3\uff09\u306e\u5229\u304d\u7b4b\u306b\u306f\u914d\u7f6e\u3067\u304d\u307e\u305b\u3093\u3002\uff08\u7e26\u3001\u6a2a\u3001\u659c\u3081\u306e\uff14\u30e9\u30a4\u30f3\uff09 \u4ee5\u4e0a\u306e\u6761\u4ef6\u3092\u5168\u3066\u6e80\u305f\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[17],"class_list":["post-570","post","type-post","status-publish","format-standard","hentry","category-java","tag-java"],"_links":{"self":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/570","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=570"}],"version-history":[{"count":5,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/570\/revisions"}],"predecessor-version":[{"id":821,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/570\/revisions\/821"}],"wp:attachment":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=570"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=570"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=570"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}