HDU1155--Bungee Jumping HDU（88）

#include <stdio.h>#include <iostream>#include <math.h>using namespace std;const double G=9.81;int main(){    double k,l,s,w;    while(scanf("%lf %lf %lf %lf",&k,&l,&s,&w))    {        if(k==0&&l==0&&s==0&&w==0)break;        double e=w*G*s;        if(s>l)e-=k*(s-l)*(s-l)/2;        if(e<0)        {            printf("Stuck in the air.\n");            continue;        }        double v=sqrt(e*2/w);        if(v>10) printf("Killed by the impact.\n");        else printf("James Bond survives.\n");    }    return 0;}

简单的动能定理。