题目：

题解：

class Solution {private String line(List<String> list,int maxWidth,int totalLength,boolean isLast){StringBuilder sb = new StringBuilder();sb.append(list.get(0));if(list.size() == 1){String ap = " ".repeat(maxWidth - totalLength);sb.append(ap);return sb.toString();}else{if(!isLast){int singleSpace = (maxWidth - totalLength) / (list.size() - 1);boolean isExact = false;int ret = 0;if(singleSpace * (list.size() - 1) == (maxWidth - totalLength)) isExact = true;else ret = (maxWidth - totalLength) - singleSpace * (list.size() - 1);String sp = " ".repeat(singleSpace);for(int i = 1;i < list.size();i++){// spaceif(!isExact && (ret--) > 0) sb.append(" ");sb.append(sp);// wordsb.append(list.get(i));}return sb.toString();}else{for(int i = 1;i < list.size();i++){// spacesb.append(" ");// wordsb.append(list.get(i));}sb.append(" ".repeat(maxWidth - sb.length()));return sb.toString();}}}public List<String> fullJustify(String[] words, int maxWidth) {int pointer = 0;int n = words.length;int totalLength = 0;int totalSize = 0;List<String> ans = new ArrayList();List<String> tmp = new ArrayList();while(pointer < n){totalLength += words[pointer].length();totalSize++;tmp.add(words[pointer]);if(totalLength + totalSize - 1 > maxWidth){tmp.remove(tmp.size() - 1);ans.add(line(tmp,maxWidth,totalLength - words[pointer].length(),false));totalLength = words[pointer].length();totalSize = 1;tmp.clear();tmp.add(words[pointer]);}pointer++;}ans.add(line(tmp,maxWidth,totalLength,true));return ans;}
}