#include<stdio.h> #include<string.h> #include<math.h> int main(){ int i,n,v1,v2,t; float time; while(~scanf("%d%d%d%d",&n,&v1,&v2,&t)){ if(v1>v2){ time=1000.0*n/(v1-v2); if(time>t) printf("NO\n"); else printf("%.2f\n",time); } else printf("NO\n"); } return 0; } |
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