Iterative python solution


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    R
        def minDepth(self, root):
            q = [(root,1)] if root else []
            while q:
                n, depth = q.pop(0)
                if None == n.left == n.right:
                    return depth
                if n.left: q.append((n.left, depth+1))
                if n.right: q.append((n.right, depth+1))
            return 0

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