#include<stdio.h> #include<math.h> int main(){ int n,v1,v2,t,flag; double a; while(scanf("%d%d%d%d",&n,&v1,&v2,&t)!=EOF) { flag=0; a=1.0*n*1000/t; if(v1==v2) flag=0; else if(v1-v2< a) flag=0; else flag=1; if(flag==1) printf("%0.2f\n",1.0*n*1000/(v1-v2)); else printf("NO\n"); } return 0; } |
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