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SameTree.java

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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;

}

else

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

}

}