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如何将一副扑克牌排序,限制条件是只能查看最上面的两张牌,交换最上面的两张牌,或是将最上面的一张牌放到这摞牌的最下
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package algo; | |
import java.util.ArrayList; | |
import java.util.List; | |
// https://v2ex.com/t/1065513 | |
public class Main { | |
public static void main(String[] args) { | |
Box box = new Box(4, 7, 2, 6, 3, 5, 8, 1, 8, 4, 76, 2, 3, 14, 0, 9, 7); | |
box.print(); | |
sort(box); | |
box.print(); | |
} | |
public static void sort(Box box) { | |
int size = box.size(); | |
for (int i = 1; i <= size; i++) { | |
bubble(box, i); | |
} | |
} | |
public static void bubble(Box box, int num) { | |
int count = box.size() - num; | |
while (count-- > 0) { | |
int[] top = box.getTop(); | |
if (top[1] > top[0]) { | |
box.swap(); | |
} | |
box.moveToBottom(); | |
} | |
count = num - 1; | |
while (count-- > 0) { | |
box.swap(); | |
box.moveToBottom(); | |
} | |
box.moveToBottom(); | |
} | |
public static class Box { | |
private final List<Integer> list; | |
public Box(int... values) { | |
List<Integer> ls = new ArrayList<>(values.length); | |
for (int value : values) { | |
ls.add(value); | |
} | |
list = ls; | |
} | |
public int[] getTop() { | |
return new int[]{list.get(0), list.get(1)}; | |
} | |
public void swap() { | |
int v = list.get(0); | |
list.set(0, list.get(1)); | |
list.set(1, v); | |
} | |
public void moveToBottom() { | |
Integer first = list.removeFirst(); | |
list.add(first); | |
} | |
public int size() { | |
return list.size(); | |
} | |
public void print() { | |
System.out.println(list); | |
} | |
} | |
} |
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