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++){
                    // space
                    if(!isExact && (ret--) > 0) sb.append(" ");
                    sb.append(sp);
                    // word
                    sb.append(list.get(i));
                }
                return sb.toString();
            }else{
                for(int i = 1;i < list.size();i++){
                    // space
                    sb.append(" ");
                    // word
                    sb.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;
    }
}