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leetcode--Scramble String
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 / a t
We say that "rgeat"
is a scrambled string of "great"
.
Similarly, if we continue to swap the children of nodes "eat"
and "at"
, it produces a scrambled string "rgtae"
.
rgtae / rg tae / \ / r g ta e / t a
We say that "rgtae"
is a scrambled string of "great"
.
Given two strings s1 and s2 of the same length, determine if s2 is a scrambled string of s1.
public class Solution { public boolean isScramble(String s1, String s2) { //we have assume that s1 and s2 have the same length and are non-empty if(s1.equals(s2)) return true; //check two string contains the same characters char[] s1char = s1.toCharArray(); char[] s2char = s2.toCharArray(); Arrays.sort(s1char); Arrays.sort(s2char); for(int i = 0; i < s1.length(); ++i){ if(s1char[i] != s2char[i]) return false; } for(int i = 1; i < s1.length(); ++i){ if(isScramble(s1.substring(0, i), s2.substring(0,i)) && isScramble(s1.substring(i), s2.substring(i))) return true; if(isScramble(s1.substring(0, i), s2.substring(s1.length() - i)) && isScramble(s1.substring(i), s2.substring(0,s1.length() - i))) return true; } return false; }}
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