标签归档: java Page 1 of 2
做了两道JAVA题
德国人养鱼和蚂蚁什么时间全部离开木棍.
题目1:在一条街上,有5座房子,喷了5种颜色,每个房里住着不同国籍的人,每个人喝不同的饮料,抽不同品牌的香烟,养不同的宠物。问题:谁养鱼? 提示:1、英国人住红色房子 2、瑞典人养狗 3、丹麦人喝茶 4、绿色房子在白色房子左面 5、绿色房子主人喝咖啡 6、抽Pall Mall 香烟的人养鸟 7、黄色房子主人抽Dunhill 香烟 8、住在中间房子的人喝牛奶 9、 挪威人住第一间房 10、抽Blends香烟的人住在养猫的人隔壁 11、养马的人住抽Dunhill 香烟的人隔壁 12、抽Blue Master的人喝啤酒 13、德国人抽Prince香烟 14、挪威人住蓝色房子隔壁 15、抽Blends香烟的人有一个喝水的邻居
当时未写程序自己推出的结果是:黄色(挪威人 水 Dunhill香烟 养猫) 蓝色-第二间房子( 丹麦人 Blends香烟 喝茶 养马) 红色-不是第一间(英国人 Pall Mall 香烟 牛奶 养鸟 ) 绿色-不在中间(德国人 抽Prince香烟 咖啡 鱼) 白色 (瑞典人 抽Blue Master 喝啤酒 养狗)。写了程序做了验证:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 | package com.ll19.test; import java.util.ArrayList; import java.util.Calendar; import java.util.HashSet; import java.util.List; import java.util.Set; public class PetFish { /** * 在一条街上,有5座房子,喷了5种颜色,每个房里住着不同国籍的人,每个人喝不同的饮料,抽不同品牌的香烟,养不同的宠物。问题:谁养鱼? * * 提示: * * 1、英国人住红色房子 2、瑞典人养狗 3、丹麦人喝茶 4、绿色房子在白色房子左面 5、绿色房子主人喝咖啡 6、抽Pall Mall 香烟的人养鸟 * 7、黄色房子主人抽Dunhill 香烟 8、住在中间房子的人喝牛奶 9、 挪威人住第一间房 10、抽Blends香烟的人住在养猫的人隔壁 * 11、养马的人住抽Dunhill 香烟的人隔壁 12、抽Blue Master的人喝啤酒 13、德国人抽Prince香烟 * 14、挪威人住蓝色房子隔壁 15、抽Blends香烟的人有一个喝水的邻居 * * @author <a href="http://www.LL19.com/">LL19.com</a> * */ // 保存所有房子的组合 private static ArrayList<string> houseList = new ArrayList</string><string>(); // 保存所有宠物的组合 private static ArrayList</string><string> petList = new ArrayList</string><string>(); // 保存所有烟的组合 private static ArrayList</string><string> smokeList = new ArrayList</string><string>(); // 保存所有饮料的组合 private static ArrayList</string><string> drinkList = new ArrayList</string><string>(); // 保存所有国籍的组合 private static ArrayList</string><string> peopleList = new ArrayList</string><string>(); // 过滤用 private static ArrayList</string><string> filterList; public static void main(String[] args) { // 开始时间 long l1 = Calendar.getInstance().getTimeInMillis(); // 房子 "绿色", "红色", "蓝色", "黄色", "白色" ArrayList</string><string> houseArray = new ArrayList</string><string>(); houseArray.add("绿色"); houseArray.add("红色"); houseArray.add("蓝色"); houseArray.add("黄色"); houseArray.add("白色"); String[] house = new String[5]; rotate(house, houseArray, houseArray.size(), houseList); // 宠物 "猫", "狗", "鱼", "马", "鸟" ArrayList</string><string> petArray = new ArrayList</string><string>(); petArray.add("猫"); petArray.add("狗"); petArray.add("鱼"); petArray.add("马"); petArray.add("鸟"); String[] pet = new String[5]; rotate(pet, petArray, petArray.size(), petList); // 烟 "PallMall", "Dunhill", "Blends", "BlueMaster", "Prince" ArrayList</string><string> smokeArray = new ArrayList</string><string>(); smokeArray.add("PallMall"); smokeArray.add("Dunhill"); smokeArray.add("Blends"); smokeArray.add("BlueMaster"); smokeArray.add("Prince"); String[] smoke = new String[5]; rotate(smoke, smokeArray, smokeArray.size(), smokeList); // 饮料 "茶", "牛奶", "水", "咖啡", "啤酒" ArrayList</string><string> drinkArray = new ArrayList</string><string>(); drinkArray.add("茶"); drinkArray.add("牛奶"); drinkArray.add("水"); drinkArray.add("咖啡"); drinkArray.add("啤酒"); String[] drink = new String[5]; rotate(drink, drinkArray, drinkArray.size(), drinkList); // 国籍 "英国人", "瑞典人", "丹麦人", "德国人", "挪威人" ArrayList</string><string> peopleArray = new ArrayList</string><string>(); peopleArray.add("英国人"); peopleArray.add("瑞典人"); peopleArray.add("丹麦人"); peopleArray.add("德国人"); peopleArray.add("挪威人"); String[] people = new String[5]; rotate(people, peopleArray, peopleArray.size(), peopleList); // 队列本身可以过滤的 // 住在中间房子的人喝牛奶 filterList = new ArrayList</string><string>(); for (int drinkNo = 0; drinkNo < drinkList.size(); drinkNo++) { String[] tmp = filter(drinkList, drinkNo); if (tmp[2].equals("牛奶")) { filterList.add(drinkList.get(drinkNo)); } } drinkList = filterList; // 挪威人住第一间房 filterList = new ArrayList<String>(); for (int peopleNo = 0; peopleNo < peopleList.size(); peopleNo++) { String[] tmp = filter(peopleList, peopleNo); if (tmp[0].equals("挪威人")) { filterList.add(peopleList.get(peopleNo)); } } peopleList = filterList; // 绿色房子在白色房子左面 filterList = new ArrayList<String>(); for (int houseNo = 0; houseNo < houseList.size(); houseNo++) { String[] tmp = filter(houseList, houseNo); for (int tmpNo = 0; tmpNo < tmp.length; tmpNo++) { // 英国人住红色房子 因为挪威人住第一间房 所以第一间不是红色 挪威人住蓝色房子隔壁 所以蓝色是第二间房 // 绿色房子主人喝咖啡 住在中间房子的人喝牛奶 所以绿色房子不在中间 if (!tmp[0].equals("红色") && tmp[1].equals("蓝色") && !tmp[2].equals("绿色")) { if (tmp[tmpNo].equals("绿色")) { // 绿色不是最后一间 if (tmpNo != 4 && tmp[tmpNo + 1].equals("白色")) { filterList.add(houseList.get(houseNo)); } } } } } houseList = filterList; // 开始过滤其他条件 boolean end = false; while (!end) { // 英国人住红色房子 peopleList = filterOneToOne(peopleList, "英国人", houseList, "红色"); houseList = filterOneToOne(houseList, "红色", peopleList, "英国人"); // 绿色房子主人喝咖啡 houseList = filterOneToOne(houseList, "绿色", drinkList, "咖啡"); drinkList = filterOneToOne(drinkList, "咖啡", houseList, "绿色"); // 瑞典人养狗 peopleList = filterOneToOne(peopleList, "瑞典人", petList, "狗"); petList = filterOneToOne(petList, "狗", peopleList, "瑞典人"); // 丹麦人喝茶 peopleList = filterOneToOne(peopleList, "丹麦人", drinkList, "茶"); drinkList = filterOneToOne(drinkList, "茶", peopleList, "丹麦人"); // 抽Pall Mall 香烟的人养鸟 smokeList = filterOneToOne(smokeList, "PallMall", petList, "鸟"); petList = filterOneToOne(petList, "鸟", smokeList, "PallMall"); // 黄色房子主人抽Dunhill houseList = filterOneToOne(houseList, "黄色", smokeList, "Dunhill"); smokeList = filterOneToOne(smokeList, "Dunhill", houseList, "黄色"); // 德国人抽Prince香烟 peopleList = filterOneToOne(peopleList, "德国人", smokeList, "Prince"); smokeList = filterOneToOne(smokeList, "Prince", peopleList, "德国人"); // 抽Blue Master的人喝啤酒 smokeList = filterOneToOne(smokeList, "BlueMaster", drinkList, "啤酒"); drinkList = filterOneToOne(drinkList, "啤酒", smokeList, "BlueMaster"); // 抽Blends香烟的人住在养猫的人隔壁 petList = filterOneToTwo(smokeList, "Blends", petList, "猫"); smokeList = filterOneToTwo(petList, "猫", smokeList, "Blends"); // 养马的人住抽Dunhill 香烟的人隔壁 smokeList = filterOneToTwo(petList, "马", smokeList, "Dunhill"); petList = filterOneToTwo(smokeList, "Dunhill", petList, "马"); // 抽Blends香烟的人有一个喝水的邻居 drinkList = filterOneToTwo(smokeList, "Blends", drinkList, "水"); smokeList = filterOneToTwo(drinkList, "水", smokeList, "Blends"); if (houseList.size() == 1 && petList.size() == 1 && smokeList.size() == 1 && drinkList.size() == 1 && peopleList.size() == 1) { end = true; } } System.out.println(houseList); System.out.println(petList); System.out.println(smokeList); System.out.println(drinkList); System.out.println(peopleList); // 结束时间 long l2 = Calendar.getInstance().getTimeInMillis(); System.out.println("用时(毫秒): " + (l2 - l1)); } // 递规方法 算出每个种类的组合 public static void rotate(String[] result, List<String> al, int index, ArrayList</string><string> list) { index = result.length - index; if (index == result.length - 1) { result[index] = (String) al.get(0); organizeNum(result, list); } for (int s1 = 0; s1 < al.size(); s1++) { result[index] = (String) al.get(s1); ArrayList<String> al1 = new ArrayList</string><string>(al); al1.remove(result[index]); rotate(result, al1, al1.size(), list); } } // 加入容器 public static void organizeNum(String[] result, ArrayList</string><string> list) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < result.length; i++) { sb.append(result[i].toString() + ";"); } String pstr = sb.toString(); list.add(pstr); } // 过滤器 public static String[] filter(ArrayList<String> list, int n) { String tmp = list.get(n); String[] tmp2 = new String[5]; tmp2 = tmp.split(";"); return tmp2; } // 过滤类似“英国人住红色房子”这样的条件 public static ArrayList</string><string> filterOneToOne(ArrayList</string><string> List1, String text1, ArrayList</string><string> List2, String text2) { Set<object> set = new HashSet</object><object>(); filterList = new ArrayList<string>(); for (int no = 0; no < List2.size(); no++) { String[] tmp = filter(List2, no); for (int no1 = 0; no1 < tmp.length; no1++) { if (tmp[no1].equals(text2)) { if (!set.contains(no1)) { set.add(no1); for (int no2 = 0; no2 < List1.size(); no2++) { String[] tmp2 = filter(List1, no2); if (tmp2[no1].equals(text1)) { filterList.add(List1.get(no2)); } } } } } } return filterList; } // 过滤类似“抽Blends香烟的人住在养猫的人隔壁”这样的条件 public static ArrayList<String> filterOneToTwo(ArrayList</string><string> List1, String text1, ArrayList</string><string> List2, String text2) { Set<object> set = new HashSet</object><object>(); Set</object><object> set2 = new HashSet</object><object>(); filterList = new ArrayList<string>(); for (int no = 0; no < List1.size(); no++) { String[] tmp = filter(List1, no); for (int tmpNo = 0; tmpNo < tmp.length; tmpNo++) { if (tmp[tmpNo].equals(text1)) { if (!set.contains(tmpNo)) { set.add(tmpNo); int tmpNo2; if (tmpNo == 0) { tmpNo2 = 1; if (!set2.contains(tmpNo2)) { set2.add(tmpNo2); for (int no2 = 0; no2 < List2.size(); no2++) { String[] tmp2 = filter(List2, no2); if (tmp2[tmpNo2].equals(text2)) { filterList.add(List2.get(no2)); } } } } else if (tmpNo == 4) { tmpNo2 = 3; if (!set2.contains(tmpNo2)) { set2.add(tmpNo2); for (int no2 = 0; no2 < List2.size(); no2++) { String[] tmp2 = filter(List2, no2); if (tmp2[tmpNo2].equals(text2)) { filterList.add(List2.get(no2)); } } } } else { tmpNo2 = tmpNo + 1; if (!set2.contains(tmpNo2)) { set2.add(tmpNo2); for (int no2 = 0; no2 < List2.size(); no2++) { String[] tmp2 = filter(List2, no2); if (tmp2[tmpNo2].equals(text2)) { filterList.add(List2.get(no2)); } } } tmpNo2 = tmpNo - 1; if (!set2.contains(tmpNo2)) { set2.add(tmpNo2); for (int no2 = 0; no2 < List2.size(); no2++) { String[] tmp2 = filter(List2, no2); if (tmp2[tmpNo2].equals(text2)) { filterList.add(List2.get(no2)); } } } } } } } } return filterList; } } |