[HackerEarth] Harry is doing magic practice on X axis.He found 4 points A,B,C,D. Now consider line AB and CD ( |AB|=|CD| ) , he guesses an angle alpha and rotates line segment AB by angle alpha keepin - 题解

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题目信息
题号 P21484
标题 [HackerEarth] Harry is doing magic practice on X axis.He found 4 points A,B,C,D. Now consider line AB and CD ( |AB|=|CD| ) , he guesses an angle alpha and rotates line segment AB by angle alpha keepin
难度 普及-
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