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《LeetCode力扣练习》代码随想录——二叉树（合并二叉树—Java）

刷题思路来源于 代码随想录

617. 合并二叉树

• 二叉树-前序遍历

  /*** Definition for a binary tree node.* public class TreeNode {* int val;* TreeNode left;* TreeNode right;* TreeNode() {}* TreeNode(int val) { this.val = val; }* TreeNode(int val, TreeNode left, TreeNode right) {* this.val = val;* this.left = left;* this.right = right;* }* }*/
  class Solution {public TreeNode mergeTrees(TreeNode root1, TreeNode root2) {return recursion(root1, root2);}private TreeNode recursion(TreeNode t1, TreeNode t2) {if (t1 == null) {return t2;}if (t2 == null) {return t1;}t1.val = t1.val + t2.val;t1.left = recursion(t1.left, t2.left);t1.right = recursion(t1.right, t2.right);return t1;}
  }