题解 | 弹地小球

#include <stdio.h>

int main() {
    int m;
    scanf("%d",&m);

    for(int j=1;j<=m;j++){
    int h,n;
    scanf("%d%d",&h,&n);
    float zonglucheng=h;
    float t=h;

    for(int i=1;i<=n-1;i++ ){
        t=t/2;
        zonglucheng=zonglucheng+t*2;
    }
    printf("%.2f\n",zonglucheng);
}
}