#include<iostream>
#include<cmath>
#include<cstdlib>
using namespace std;

const int SHIP=1;
const int BAR=2;
const int WATER=3;

int drunkard(void)
{
int x=-10;   //酒者一开始在酒馆 
int y=0;     //酒者一开始在跳板中央 
int step=0;  //初始化酒者的步数 
while(abs(x)<=10&&abs(y)<=2)
{
switch(rand()%10)
{
case 0:
y--;  break;  //向左走 
case 1:
y++;  break;  //向右走 
case 2:
x--;  break;  //向后 
default:
x++;  break;  //向前 
} 
step++;
}                       
if(x<-10&&abs(y)<=2)      //在跳板内返回酒吧 
{
cout <<"经过" <<step <<"步后drunkard返回酒吧" <<endl ;
return BAR; 
}
else 
{
if(x>10&&abs(y)<=2)  //在跳板内返回船 
{
cout <<"经过" <<step <<"步后drunkard返回船上" <<endl ;
return SHIP; 
}
   else      //y>2时表示为落水 
   {
    cout <<"经过" <<step <<"步后drunkard掉进水里" <<endl ;    //
    return WATER;
}
}
}


int main()
{

int numbdrunkard;
int backship=0;      //初始化很重要，不然数据会不准确 
int backbar=0; 
int dropwater=0;
cout <<"请输入drunkard的数量：";
cin >>numbdrunkard ;
for(int i=0;i<numbdrunkard;i++) 
{
switch(drunkard())                   //计数 
{
case SHIP:
backship++;     break;
case BAR:
backbar++;      break;
case WATER:
dropwater++;    break;
}
}
cout <<"——————————————————" <<endl ; 
cout <<backship <<"个drunkard回到船中 " <<endl ; 
cout <<backbar <<"个drunkard回到酒吧 " <<endl ;
cout <<dropwater <<"个drunkard落到水中 " <<endl ;
return 0;

}