Same Tree
Chack if two tree is the same. This is a simple problem, but please note that in the code we
are using ^
operator to check if two boolean expression is not equal.
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
public class Solution {
public boolean isSameTree(TreeNode p, TreeNode q) {
if (p == null && q == null) return true;
if (p == null ^ q == null) return false;
if (p.val != q.val) return false;
return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
}
}
p == null ^ q == null
can also be replaced with (p == null) != (q == null)
.