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25 lines
616 B
C++
25 lines
616 B
C++
#include <cmath>
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#include <cstdio>
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const double pi = acos(-1.0), eps = 1e-6;
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double S;
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inline double calc(double r)
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{
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double l = (S - r * r) / r;
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double h = sqrt(l * l - r * r);
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return pi * r * r * h / 3;
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}
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int main()
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{
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while (~scanf("%lf", &S))
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{
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S /= pi;
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double l = 0, r = sqrt(S), m1, m2, d;
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while ((d = r - l) > eps)
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calc(m1 = l + d / 3) < calc(m2 = r - d / 3) ? l = m1 : r = m2;
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l = (S - r * r) / r;
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double h = sqrt(l * l - r * r);
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double V = pi * r * r * h / 3;
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printf("%.2f\n%.2f\n%.2f\n", V, h, r);
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}
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return 0;
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} |