r*********n
发帖数: 4553 | 1 Given a string s1, we may represent it as a binary tree by partitioning it
to two non-empty substrings recursively.
Below is one possible representation of s1 = "great":
great
/
gr eat
/ /
g r e at
/
a t
To scramble the string, we may choose any non-leaf node and swap its two
children.
For example, if we choose the node "gr" and swap its two children, it
produces a scrambled string "rgeat".
rgeat
/
rg eat
/ /
r g e at
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