class Solution:
    # @param s: a list of char
    # @param offset: an integer 
    # @return: nothing
    def rotateString(self, s, offset):
        # write you code here

       # 198ms 
       if not s:return s
       n = len(s)
       offset = offset % n
       if not s:return s
       for i in
 
 range(offset):
           t = s.pop()
           s.insert(0,t)

       # 189ms 分別賦值
       if not s:return s
       n = len(s)
       offset = offset % n
       if not offset:return s
       temp_pre = s[-offset:]
       temp_las = s[0:n-offset]

       m = len(temp_pre)
       for i in range(len(temp_pre)):
           s[i] = temp_pre[i]
       for
 
 i in range(len(temp_pre), n):
           s[i] = temp_las[i - m]

       # 206ms  字串 * 2
       if not s:return s
       n = len(s)
       offset = offset%n
       if not offset:return s
       temp = s*2
       for i in range(n):
           s[i] = temp[n-offset+i]

       # 198ms 互換位置   
       if not
 
 s: return s
       n = len(s)
       offset = offset % n
       if not offset:return s
       s[0:n-offset], s[-offset:] = s[-offset:], s[0:n-offset]

       # 226ms 三次反轉
       if not s:return s
       n = len(s)
       offset = offset % n
       if not offset:return s

       s[0:n-offset] = reversed(s[0:n-offset])
       s[-offset:] = reversed(s[-offset:])
       s[::] = reversed(s)