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The set of cyclic rotations of a string are the strings obtained by embedding the string clockwise on a ring, with the first character following on the last, starting at any character position and moving clockwise on the ring until the character preceeding the starting character is reached. A string is a necklace if it is the lexicographically smallest among all its cyclic rotations. For instance, for the string 01011 the cyclic rotations are (10110,01101,11010,10101,01011), and furthermore 01011 is the smallest string and hence, a necklace.
5 0 0101 0001 0010 11101111011
(0) (0101) (0001) (001)(0) (111)(01111)(011)
| 时间上限 | 内存上限 |
| 1000 | 65536 |