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;
}
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