zoj 3083 Ball Bearings

#include <cmath>#include <cstdio>const double PI = acos(-1.0);int main() {    double D, d, s;    int re;    scanf("%d", &re);    for (int ri = 1; ri <= re; ++ri) {        scanf("%lf%lf%lf", &D, &d, &s);        printf("%.0lfn", floor(PI / asin((s + d) / (D - d))));    }    return 0;}