原题：
  以单词为最小单位翻转字符串
  write the function string reversestringwordbyword(string input) that reverses
  a string word by word.  for instance,
  reversestringwordbyword('the house is blue') --> 'blue is house the'
  reversestringwordbyword('zed is dead') --> 'dead is zed'
  reversestringwordbyword('all-in-one') --> 'all-in-one'
面试系列4种的实现，比较费空间，因为多申请了一段空...[查看详情]