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SameTree.java
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33 lines (28 loc) · 805 Bytes
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package net.kenyang.algorithm;
/**
* Given two binary trees, write a function to check if they are equal or not.
* Two binary trees are considered equal if they are structurally identical and the nodes have the same value.
* @author Ken Yang
*
*/
public class SameTree {
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
}
}
public boolean isSameTree(TreeNode p, TreeNode q) {
if (p == null && q == null) {
return true;
}
if ((p != null && q == null)
|| (p == null && q != null)
|| (p.val != q.val)) {
return false;
}
return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
}
}