题解 | #牛牛的水杯#

#include <stdio.h>
#include<math.h>

int main() {
    int a, b;
    scanf("%d%d", &a, &b);
    double v = 3.14 * a * pow(b, 2) / pow(10, 3);
    int ret = 0;
    if (10 / v == 0) {
        ret = (int)10 / v;
        printf("%d", ret);
    } else {
        ret = (int)10 / v + 1;
        printf("%d", ret);
    }
    return 0;
}