-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathUnionFind1.java
More file actions
58 lines (50 loc) · 1.05 KB
/
UnionFind1.java
File metadata and controls
58 lines (50 loc) · 1.05 KB
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
package union;
/**
* 第一版并查集
*/
public class UnionFind1 implements UF{
private int[] id;
public UnionFind1(int size) {
id = new int[size];
for (int i = 0; i < size; i++) {
id[i] = i;
}
}
/**
* 返回p所在的集合id
* @param p
* @return
*/
private int find(int p) {
if (p < 0 || p >= id.length) {
throw new IllegalArgumentException("Index is illegal");
}
return id[p];
}
@Override
public int getSize() {
return id.length;
}
@Override
public boolean isConnected(int p, int q) {
return find(p) == find(q);
}
/**
* 合并p和q所属的集合
* @param p
* @param q
*/
@Override
public void unionElements(int p, int q) {
int pId = find(p);
int qId = find(q);
if (pId == qId) {
return;
}
for (int i = 0; i < id.length; i++) {
if (pId == id[i]) {
id[i] = qId;
}
}
}
}