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2018 Multi-University Training Contest 6 Solution
時間 2021-01-06
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A - oval-and-rectangle 題意:給出一個橢圓的a 和 b,在$[0, b]中隨機選擇c$ 使得四個頂點在橢圓上構成一個矩形,求矩形周長期望 思路:求出每種矩形的周長,除以b(積分) 1 #include<bits/stdc++.h> 2 3 using namespace std; 4 5 const double PI = acos(-1.0); 6 7
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