#include <iostream> #include <math> using namespace std; int main(){ double n,v1,v2,t,time; while(scanf("%lf%lf%lf%lf",&n,&v1,&v2,&t)!=EOF){ if(n==0) printf("0.00\n"); if((v1<=0&&v2>=0)||(v1>0&&v2>0&&v2>=v1)||(v1<0&&v2<0&&v2>=v1)) printf("NO\n"); else if(v1>=0&&v2<=0){ time = n*1000/(v1-v2); if(time<=t) printf("%.2lf\n",time); else printf("NO\n"); } else{ time = n/abs(v1-v2); if(time<=t) printf("%.2lf\n",time); else printf("NO\n"); } } return 0; } /* Main.cc:2:16: fatal error: math: No such file or directory #include <math> ^ compilation terminated. */ |
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