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Niuke white moon race 6 [solution]

2022-04-23 02:56:00 【Hui Xiaoge】

https://ac.nowcoder.com/acm/contest/136

Catalog

Kun 【 thinking 】

Kun 【 thinking 】

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Special attention here , We need to meet our actual situation .
If b>a You can't turn back , When I turned back, I met .
If a>b You need to determine , When you go back , Is the distance between the two greater than or equal to k

#include<bits/stdc++.h>
using namespace std;
typedef long long int LL;
int main(void)
{
    
	double l,k,a,b; cin>>l>>k>>a>>b;
	double t1=l/a,t2=l/b;
   	if(a>b)
   	{
    
   		double t=k/(a-b);
   		if(l-t*2*a>=k) t2=min(t2,t*2);
   	}
   	printf("%.2lf",t2-t1);
	return 0;
}