blob: 0a71d431a40569b8d0ce9b4bceea6a84aa7fbbf7 (
plain)
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
|
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
public class Ch2 {
public static void main(String[] args) {
ArrayList<Integer> list1 = new ArrayList<>(List.of(15,99,1,34));
ArrayList<Integer> list2 = new ArrayList<>(List.of(50,25,33,22));
persistence_sort(list1);
persistence_sort(list2);
System.out.println(list1);
System.out.println(list2);
}
private static int product(int n) {
int prod = 1;
while(n > 0)
{
prod *= n % 10;
n /= 10;
}
return prod;
}
private static int helper(int n) {
int sum = 0;
while(n >= 10)
{
sum++;
n = product(n);
}
return sum;
}
private static void persistence_sort(List<Integer> list) {
list.sort(new Comparator<Integer>() {
@Override
public int compare(Integer a, Integer b) {
int ha = helper(a);
int hb = helper(b);
return ha == hb ? Integer.compare(a,b) :
Integer.compare(ha,hb);
}});
}
}
|
