#include <stdio.h> int main(void) { int n,v1,v2,totalt; double needt; while(scanf("%d%d%d%d",&n,&v1,&v2,&totalt) != EOF) { if(v2 >= v1) printf("NO\n"); else { if((v1 - v2) * totalt >= n * 1000) { needt = 1.0 * n * 1000 / (v1 - v2); printf("%.2lf\n",needt); } else printf("NO\n"); } } return 0; } |
Double click to view unformatted code.