UVA 10868 - Bungee Jumping

来源：互联网发布：分离音频的软件编辑：程序博客网时间：2024/05/01 12:26

物理题。很简单。中间用到了积分求绳子做功。动能定理。

分类讨论绳子长度与高度。

当绳子长度大于高度的时候自由落体。

如果高度大于绳子长度先自由落体然后重力和绳子拉力同时做功。动能定理求解最终的速度。判断即可。

#include <cstdio>#include <iostream>#include <vector>#include <queue>#include <cstring>#include <string>#include <map>#include <set>#include <cmath>#include <algorithm>#include <cstdlib>using namespace std;#define ll long long#define maxn 2000 + 10int main (){    double k,l,h,w;    double g =9.81;    while(scanf("%lf%lf%lf%lf",&k,&l,&h,&w)){        if(k == 0 && l == 0 && h == 0 && w == 0)        break;        if(l >= h){            double v = sqrt(2*g*h);            if(v > 10)                printf("Killed by the impact.\n");            else                printf("James Bond survives.\n");        }        else{            double v0 = sqrt(2*g*h);            double x = w*g*(h-l) - 0.5*k*(h - l)*(h - l) + g*l*w;            if(x < 0)                printf("Stuck in the air.\n");            else{                double v = sqrt(x * 2 / w);                if(v <= 10)                    printf("James Bond survives.\n");                else                    printf("Killed by the impact.\n");            }        }    }    return 0;}

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