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+public class _0617MergeTwoBinaryTrees %7B%0A  public TreeNode mergeTrees(TreeNode t1, TreeNode t2) %7B%0A    if (t1 == null) %7B%0A      return t2;%0A    %7D%0A    if (t2 == null) %7B%0A      return t1;%0A    %7D%0A    t1.val += t2.val;%0A    if (t1.left != null) %7B%0A      if (t2.left != null) %7B%0A        mergeTrees(t1.left, t2.left);%0A      %7D%0A    %7D else %7B%0A      t1.left = t2.left;%0A    %7D%0A    if (t1.right != null) %7B%0A      if (t2.right != null) %7B%0A        mergeTrees(t1.right, t2.right);%0A      %7D%0A    %7D else %7B%0A      t1.right = t2.right;%0A    %7D%0A    return t1;%0A  %7D%0A%0A  public class TreeNode %7B%0A      int val;%0A      TreeNode left;%0A      TreeNode right;%0A      TreeNode(int x) %7B val = x; %7D%0A  %7D%0A%7D%0A

Add _0617MergeTwoBinaryTrees