each of the elements of the string is changed to its reverse (if it has a reverse),有歧异。正确理解是如果串中没有reverse则不为mirrored string。但题中的意思给人的感觉是如果存在reverse的情况下则替换，不存在是就不管，而非不存在就直接判断不为mirrored string，害得我WA了好多次。

• Re:each of the elements of the string is changed to its reverse (if it has a reverse) (243) BU 2006-03-18 13:47:17
• Re:each of the elements of the string is changed to its reverse (if it has a reverse) (1580) BU 2006-03-18 14:26:32
• Re:each of the elements of the string is changed to its reverse (if it has a reverse) (230) KosonLau 2007-12-27 16:09:41
• Re:each of the elements of the string is changed to its reverse (if it has a reverse) (219) liuyuquan100 2008-04-18 15:13:01