UVA 10491 - Cows and Cars

10491.cpp

#include <bits/stdc++.h>
using namespace std;

int main() {
    int v, c, o, n;
    while(scanf("%d %d %d\n", &v, &c, &o) == 3) {

        n = c + v;
        double answ = (c *  (c - 1)) / (n * (n - o - 1) * 1.0);
        answ += (c * v * 1.0) / (n * (n - o - 1));

        printf("%.5f\n", answ);

    }
    return 0;
}