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TextJustification.java
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128 lines (111 loc) * 4.05 KB
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package Leetcode;
import java.util.ArrayList;
import java.util.List;
/**
* @author kalpak
*
* Given an array of words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right) justified.
*
* You should pack your words in a greedy approach; that is, pack as many words as you can in each line.
* Pad extra spaces ' ' when necessary so that each line has exactly maxWidth characters.
*
* Extra spaces between words should be distributed as evenly as possible.
* If the number of spaces on a line do not divide evenly between words, the empty slots on the left will be assigned more spaces than the slots on the right.
*
* For the last line of text, it should be left justified and no extra space is inserted between words.
*
* Note:
* A word is defined as a character sequence consisting of non-space characters only.
* Each word's length is guaranteed to be greater than 0 and not exceed maxWidth.
* The input array words contains at least one word.
*
*
* Example 1:
* Input: words = ["This", "is", "an", "example", "of", "text", "justification."], maxWidth = 16
* Output:
* [
* "This is an",
* "example of text",
* "justification. "
* ]
*
* Example 2:
* Input: words = ["What","must","be","acknowledgment","shall","be"], maxWidth = 16
* Output:
* [
* "What must be",
* "acknowledgment ",
* "shall be "
* ]
* Explanation: Note that the last line is "shall be " instead of "shall be", because the last line must be left-justified instead of fully-justified.
* Note that the second line is also left-justified becase it contains only one word.
*
* Example 3:
* Input: words = ["Science","is","what","we","understand","well","enough","to ","explain","to","a","computer.","Art","is","everything","el se","we","do"], maxWidth = 20
* Output:
* [
* "Science is what we",
* "understand well",
* "enough to explain to",
* "a computer. Art is",
* "everything else we",
* "do "
* ]
*
*
* Constraints:
*
* 1 <= words.length <= 300
* 1 <= words[i].length <= 20
* words[i] consists of only English letters and symbols.
* 1 <= maxWidth <= 100
* words[i].length <= maxWidth
*
*/
public class TextJustification {
public static List<String> fullJustify(String[] words, int maxWidth) {
List<String> result = new ArrayList<>();
int i = 0;
int n = words.length;
while(i < n) {
int j = i + 1;
int lineLength = words[i].length();
while(j < n && (lineLength + words[j].length() + (j - i - 1) < maxWidth)) {
lineLength += words[j].length();
j++;
}
int diff = maxWidth - lineLength; // amount of spaces needed.
int numOfWords = j - i;
if(numOfWords == 1 || j >= n)
result.add(leftJustify(words, diff, i, j));
else
result.add(middleJustify(words, diff, i, j));
i = j;
}
return result;
}
private static String leftJustify(String[] words, int diff, int i, int j) {
int spacesOnRight = diff - (j - i - 1);
StringBuilder sb = new StringBuilder(words[i]);
for(int k = i + 1; k < j; k++) {
sb.append(" " + words[k]);
}
sb.append(" ".repeat(spacesOnRight));
return sb.toString();
}
private static String middleJustify(String[] words, int diff, int i, int j) {
int spacesNeeded = j - i - 1;
int spaces = diff / spacesNeeded;
int extraSpaces = diff % spacesNeeded;
StringBuilder sb = new StringBuilder(words[i]);
for(int k = i + 1; k < j; k++) {
int spacesToApply = spaces + (extraSpaces-- > 0 ? 1 : 0);
sb.append(" ".repeat(spacesToApply) + words[k]);
}
return sb.toString();
}
public static void main(String[] args) {
String[] words = new String[]{"This", "is", "an", "example", "of", "text", "justification."};
System.out.println(fullJustify(words, 16));
}
}