森林轉為二叉樹的三步
(1)連線(將兄弟結點相連各樹的根看作兄弟)
(2)切線(保留最左邊子女為獨生子女將其它子女分枝切掉)
(3)旋轉(以最左邊樹的根為軸順時針向下旋轉度)
其實經過(1)和(2)已轉為二叉樹執行(3)只是為了與平時的二叉樹的畫法一致
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