7-13.非常弹的球

代码

#include <bits/stdc++.h>

using namespace std;

const int N = 1e3 + 10;

int main() {
    double w, p;
    cin >> w >> p;
    p = (100.0 - p) / 100.0;
    w = w / 100.0;
    double s = 0.0;
    double v = 2.0 * 1000.0 / w;

    while (v > 1e-8) {
        s += (v / 9.8);
        v = v * p;
    }
    printf("%.3lf", s);
    
    return 0;
}