LeetCode 1325 Delete Leaves With a Given Value (DFS)
Givenabinarytreerootandanintegertarget,deletealltheleafnodeswithvaluetarget.Notethatonceyoudeletealeafnodewithvaluetarget,ifit'sparentnodebecomesaleafnodeandhasthevaluetarget,itshouldalsobedeleted(you