Easy_7_100_Same Tree.java

public class Solution {
    public boolean isSameTree(TreeNode p, TreeNode q) {
        if(p==null && q== null)
            return true;
        else if(p==null && q!=null)
            return false;
        else if(p!=null && q==null)
            return false;
        else if(p.val != q.val)
            return false;
        else
            return isSameTree(p.left,q.left) && isSameTree(p.right,q.right);
    }
}