上海交通大学：《程序设计基础》课程教学讲义（密西根学院）Lecture Notes_20 Looking Ahead

Step 7 Move from Sre to Aux

Step 8 Move from Sre to Dst

Step 9 Move from Aux to Dst > 5

Step 10 Move from Aux to Sre >

Step 11 Move from Dst to Sre >