题目描述: ##求给定二叉树的最小深度。最小深度是指树的根结点到最近叶子结点的最短路径上结点的数量。 Given a binary tree, find its minimum depth.The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.解: public int run(TreeNode root) { if(root==null){ return 0; ...