给邻接表的图实现添加一个边是否存在的判定 #1407
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给邻接表的图实现添加一个边是否存在的判定 #1407
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在rust的邻接表实现图的程序中，对于添加边（或删除边）缺少了确认边存在（或不存在）。这会导致如果出现边存在的情况下添加边导致列表中存在重复的边。
添加一个判定后可避免该结果的产生