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100. Same Tree


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.

/**
* 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);
}
}

/**
* 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) return q == null;
if(q == null) return p == null;

if(p.val != q.val) return false;

return(isSameTree(p.left, q.left) && isSameTree(p.right, q.right));
}
}


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