#include<stdio.h> #include<string.h> #include<stdlib.h> #include<math.h> int main(){ int n,v1,v2,t; while(scanf("%d %d %d %d",&n,&v1,&v2,&t)!=EOF){ if(v1<v2){ printf("NO\n"); }else{ int dis=abs(v1-v2); double time=n*1000*1.0/dis*1.0; if(time<=t){ printf("%.2lf\n",time); }else{ printf("NO\n"); } } } } |
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