#include <stdio.h> int main(int argv, char *argc[]) { int n, v1, v2, t, disp; float time; while(scanf("%d", &n) != EOF){ scanf("%d%d%d", &v1, &v2, &t); disp = v1 - v2; if(disp * t < n){ printf("NO\n"); }else{ time = (float)n * 1000 / disp; printf("%.2f\n", time); } } return 0; } |
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