Python - 85% Faster - Simple - No New Nodes

  • 0
        def mergeTrees(self, t1, t2):
            if not t1:
                return t2
            if t2:
                t1.val += t2.val
                t1.left = self.mergeTrees(t1.left, t2.left)
                t1.right = self.mergeTrees(t1.right, t2.right)
            return t1

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