Codeforces 624A Save Luke

题目：点击打开链接

代码：

#include<stdio.h>#include<string.h>using namespace std;int main(){    double d,l,v1,v2;    //while(1){    scanf("%lf%lf%lf%lf",&d,&l,&v1,&v2);    printf("%.6lf",(l-d)/(v1+v2));}