#givingwaterpipopooooopopooo opoooyooo ooopyoooooooooooooo poop ppupopooo oooooopoopoouopoooo pity oopppoooooo pop o o open o p I pppoopo p of the poop prank pooping oopooppp o lol oh OK I purposely...
非递归方法中序遍历下面这颗二叉树,其堆栈操作序列(P代表为push,O代表为pop)是什么?A.PPOOPOPPOOB.PPPPPOOOOOC.PPPOOOPPOOD.P