题解 | #牛牛的水杯#

#include<stdio.h>
int main(){
    //1L水=1000立方厘米
    //10L水=10000立方厘米
    //一杯水的体积为s*h
    //s = Π*r*r;
    float s = 0;  
    float v = 0;
    int h = 0;
    int r = 0;
    float n = 0;
    scanf("%d %d",&h,&r);
    s = 3.14*r*r;//水杯底面积
    v = s*h;//水杯体积，单位为立方厘米
    n = 10000.0f/v;
    if(n-(int)n == 0)
        printf("%d",(int)n);
    if(n-(int)n != 0)
        printf("%d",(int)n+1);
    return 0;
}