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
|
public class WordBreakII {
public List<String> wordBreak(String s, Set<String> wordDict) {
List<String> result = new ArrayList<String>();
if (s == null || s.isEmpty()) {
return result;
}
List<String> map[] = new ArrayList[s.length() + 1];
map[0] = new ArrayList<String>();
for (int i = 0; i < s.length(); i++) {
if (map[i] == null) {
continue;
}
for (String str : wordDict) {
int l = str.length();
int end = i + l;
if (end > s.length()) {
continue;
}
if (s.substring(i, end).equals(str)) {
if (map[end] == null) {
map[end] = new ArrayList<String>();
}
map[end].add(str);
}
}
}
if (map[s.length()] == null) {
return result;
}
helper(s.length(), result, new ArrayList<String>(), map);
return result;
}
private void helper(int end, List<String> result, List<String> crt, List<String> map[]) {
if (end <= 0) {
StringBuilder sb = new StringBuilder();
for (int i = crt.size() - 1; i >= 0; i--) {
String s = crt.get(i);
sb.append(s).append(' ');
}
sb.deleteCharAt(sb.length() - 1);
result.add(sb.toString());
}
for (String s : map[end]) {
List<String> tmp = new ArrayList<String>(crt);
tmp.add(s);
helper(end - s.length(), result, tmp, map);
}
}
}
|