give binary tree original clone give reference node target original treethe cloned tree copy original treeReturn reference node clone treenote allow change tree target node answer reference node clone tree Example 1input tree 743nullnull619 target 3output 3explanation in example original cloned tree show the target node green node original tree the answer yellow node clone treeExample 2input tree 7 target 7Output 7Example 3input tree 8null6null5null4null3null2null1 target 4Output 4 ConstraintsThe number nod tree range 1 104the value nod tree uniquetarget node node original tree null Follow could solve problem repeat value tree allow