codeforces 700A

codeforces 700A

http://codeforces.com/contest/700/problem/A
代码如下：

#include <iostream>#include <vector>#include <cstdio>#include <cmath>#include <cstring>#include <set>#include <map>#include <algorithm>#include <queue>using namespace std;int main() {    int n, k;    double l, v1, v2;    cin >> n >> l >> v1 >> v2 >> k;    int b = (n + k - 1) / k;    double den = (2 * (b - 1) * v1 / (v1 + v2)) + 1;    double x = l / den;    double ans = x / v2 + (l - x) / v1;    printf("%0.9f\n", ans);    return 0;}