give root binary tree return tree subtree given tree contain 1 removedA subtree node node node plus node descendant node Example 1input root 1null001output 1null0null1explanation only red node satisfy property subtree contain 1the diagram right represent answerExample 2input root 1010001output 1null1null1example 3input root 11011010output 11011null1 ConstraintsThe number nod tree range 1 200nodeval 0 1