public class Solution {
 public IList<string> FullJustify(string[] words, int maxWidth) {
 IList<string> res = new List<string>();
 int i = 0;
 int chLength = 0; //字符所占的长度
 int wordLength = 0; //单词个数
 
 int space = 0;
 
 while(i < words.Length)
 {
 string word = words[i];
 if(wordLength + chLength + word.Length <= maxWidth)
 {
 wordLength++;
 chLength += word.Length;
 i++; 
 continue;
 }
 
 space = maxWidth - chLength;
 if(wordLength == 0) return res;
 if(wordLength == 1)
 {
 res.Add(words[i - 1].PadRight(maxWidth, ' ')); 
 }
 else
 {
 int wordSpace = space / (wordLength - 1);
 int extraSpace = space % (wordLength - 1);
 int start = i - wordLength;
 string cur = string.Empty;
 for(int j = start; j < start + extraSpace; j++)
 {
 cur += words[j];
 cur += new string(' ', wordSpace + 1);
 }
 for(int j = start + extraSpace; j < i - 1; j++)
 {
 cur += words[j];
 cur += new string(' ', wordSpace);
 }
 cur += words[i - 1];
 res.Add(cur);
 } 
 chLength = 0;
 wordLength = 0;
 }
 //加上最后一行
 if(wordLength == 0) return res;
 space = maxWidth - chLength;
 if(wordLength == 1)
 {
 res.Add(words[i - 1].PadRight(maxWidth, ' ')); 
 }
 else
 {
 int start = i - wordLength;
 string cur = string.Empty;
 for(int j = start; j < i - 1; j++)
 {
 cur += words[j];
 cur += ' ';
 }
 cur += words[i - 1];
 
 res.Add(cur.PadRight(maxWidth, ' '));
 } 
 return res;
 }
}
class Solution:
 def fullJustify(self, words, maxWidth):
 """
 :type words: List[str]
 :type maxWidth: int
 :rtype: List[str]
 """
 res, cur, num_of_letters = [], [], 0
 for w in words:
 if num_of_letters + len(w) + len(cur) > maxWidth:
 for i in range(maxWidth - num_of_letters):
 cur[i%(len(cur)-1 or 1)] += ' '
 res.append(''.join(cur))
 cur, num_of_letters = [], 0
 cur += [w]
 num_of_letters += len(w)
 return res + [' '.join(cur).ljust(maxWidth)]