leetcode：Binary Tree Inorder Traversal

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二叉树的中序遍历

/** * Definition for binary tree * public class TreeNode { *     int val; *     TreeNode left; *     TreeNode right; *     TreeNode(int x) { val = x; } * } */public class Solution {    static ArrayList<Integer> ans ;     public ArrayList<Integer> inorderTraversal(TreeNode root) {        ans = new ArrayList<>();        travel(root);        return ans;    }        void travel(TreeNode node){        if(node != null ){            travel(node.left);            ans.add(node.val);            travel(node.right);        }    }}

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