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原本gif图像中pre与cur指针的移动先后顺序有误;同时个人觉得最好在动画中同时绘制出temp指针,否则仅看动画不能理解cur指针是如何向右移动的。故在修正原本两个指针的移动顺序之后又添加了temp指针在演示动画中。