POJ1696 Space Ant(贪心、向量叉乘、向量极角、线段相交、点在线段上)

题目链接:   http://poj.org/problem?id=1696 题目描述: Space Ant   Description The most exciting space discovery occurred at the end of the 20th century. In 1999, scientists traced down an ant-like creature in
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