摘要:
The railway line “Yekaterinburg-Sverdlovsk” with several stations has been built. This railway line can be represented as a line segment, railway stations being points on it. The railway l... 阅读全文
2010年10月4日
摘要:
7月17日是Mr.W的生日,ACM-THU为此要制作一个体积为N*pi的M层生日蛋糕,每层都是一个圆柱体。 设从下往上数第i(1 <= i <= M)层蛋糕是半径为Ri, 高度为Hi的圆柱。当i < M时,要求Ri > Ri+1且Hi > Hi+1。 由于要在蛋糕上抹奶油,为尽可能节约经费,我们希望蛋糕外表面(最下一层的下底面除外)的面积Q最小。 令Q = S*pi ... 阅读全文