View Code of Problem 104

#include<stdio.h>
#include<string.h>
#include <math.h>
#define Max 1000
int main()
{
	int n,v1,v2,t;
	float time;
	while(scanf("%d %d %d %d",&n,&v1,&v2,&t)!=EOF)
	{
		int d=v1-v2;
		if((d*t)<(n*1000))
		{
			printf("NO\n");
		} 
		else
		   {
		   	time=(float)n*1000/d;
		   	printf("%.2f\n",time);
		   }
	}
	return 0;
}

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