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
|
import static org.junit.Assert.assertSame;
public class TextJustification {
public List<String> fullJustify(String[] words, int maxWidth) {
List<String> result = new ArrayList<String>();
if (words == null || words.length == 0) {
return result;
}
if (maxWidth == 0) {
result.add("");
return result;
}
int crt = 0;
int pre = 0;
int count = 0;
while (pre < words.length) {
count = words[crt].length() + 1;
while (count <= maxWidth + 1 && crt < words.length - 1) {
crt++;
count += words[crt].length() + 1;
}
if (crt == words.length - 1 && count <= maxWidth + 1) {
StringBuilder sb = new StringBuilder();
for (int i = pre; i < words.length - 1; i++) {
sb.append(words[i]).append(' ');
}
sb.append(words[words.length - 1]);
result.add(appendSpace(sb.toString(), maxWidth));
break;
}
if (crt - pre == 1) {
result.add(appendSpace(words[pre], maxWidth));
} else {
count = count - words[crt].length() - 2;
int realLength = maxWidth - count;
int spaceCount = realLength / (crt - pre - 1) + 1;
int extra = realLength % (crt - pre - 1);
result.add(getLine(words, pre, crt - pre, spaceCount, extra));
}
pre = crt;
}
return result;
}
private String getLine(String[] words, int start, int count, int spaceCount, int extra) {
StringBuilder sb = new StringBuilder();
StringBuilder _sb = new StringBuilder();
for (int i = 0; i < spaceCount; i++) {
_sb.append(' ');
}
String spaceStr = _sb.toString();
for (int i = start; i < start + count - 1; i++) {
sb.append(words[i]).append(spaceStr);
if (extra-- > 0) {
sb.append(' ');
}
}
sb.append(words[start + count - 1]);
return sb.toString();
}
private String appendSpace(String s, int maxWidth) {
StringBuilder sb = new StringBuilder(s);
while (sb.length() < maxWidth) {
sb.append(' ');
}
return sb.toString();
}
@Test
public void test() {
String[] words = new String[]{"This", "is", "an", "example", "of", "text", "justification."};
List<String> result = fullJustify(words, 16);
assertSame("example of text", result.get(1));
words = new String[]{"a", "b", "c", "d", "e"};
result = fullJustify(words, 1);
}
}
|