只要努力飞翔，即使再弱小的蝴蝶也可以飞的很高
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黄一航 • 1年前
include <bits/stdc++.h>
using namespace std; double x,y,c;
bool chk(double l) {
double a = sqrt(x * x - l * l),b = sqrt(y * y - l * l);
return (a + b) * c < a * b;
}
signed main() {
while (cin >> x >> y >> c)
{
double l = 0,r = min(x,y);
while (l <= r)
{
double mid = l + (r - l) / 2;
if (chk(mid)) l = mid + 1e-4;
else r = mid - 1e-4;
}
printf("%.3lf\n",l);
}
return 0;
}
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