11.10

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#include <graphics.h>
#include<time.h> //包含随机数，时间函数
#include<bits/stdc++.h>
using namespace std;
int high=600,width=800,num;
struct ballon
{
	float x;
	float y;
	int r;
	float vx;
	float vy;
	float g;
	unsigned int R_color,G_color,B_color;
	COLORS color;
	int health;
}ball[1000];

void is_ill()
{
	for(int i=0;i<num;i++)
	{
		for(int j=0;j<num;j++)
		{
			if(ball[i].health!=ball[j].health)
			{
				if((abs(ball[i].x-ball[j].x)<=ball[i].r+ball[j].r)&&
				(abs(ball[i].y-ball[j].y)<=ball[i].r+ball[j].r))
				{
					ball[i].health=0;
					ball[j].health=0;
				}
			}
		}
	}
}
float ranx(int min,int max)
{
	float h;
	h=rand()%(max-min)+min;
	return h;
}

void startup()
{
	srand(time(0));//随机种子函数        
    for(int i =0;i<num;i++)
    {
        ball[i].x = ranx(ball[i].r+1,width-ball[i].r-1);
        ball[i].y = ranx(ball[i].r+1,high-ball[i].r-1);
        ball[i].vx = ranx(-2,3);
        ball[i].vy = ranx(-2,5);
        ball[i].r = 10+rand()%10;
		ball[i].R_color = ranx(10,255);
        ball[i].G_color = ranx(10,255);
        ball[i].B_color = ranx(10,255); 
        ball[i].color=GREEN;
		ball[i].health=1; 
	}
	ball[0].color=RED;
	ball[0].health=0; 
	initgraph(800, 600); 
}

void update()
{
	for(int i=0;i<num;i++)
	{
		ball[i].vy=ball[i].vy+ball[i].g;
			ball[i].vx=ball[i].vx+ball[i].g;
			ball[i].y+=ball[i].vy;
			ball[i].x+=ball[i].vx;
			if(ball[i].y>=high-ball[i].r)
			{
				ball[i].y=high-ball[i].r;
				ball[i].vy=-ball[i].vy;
			}
			if(ball[i].y<=ball[i].r)
			{
				ball[i].y=ball[i].r;
				ball[i].vy=-ball[i].vy;
			}
			if(ball[i].x<=ball[i].r)
			{
				ball[i].x=ball[i].r;
				ball[i].vx=-ball[i].vx;
			}
			if(ball[i].x>=width-ball[i].r)
			{
				ball[i].x=width-ball[i].r;
				ball[i].vx=-ball[i].vx;
			}
	}
}

void drawball()
{
	for(int i=0;i<num;i++)
	{
		if(ball[i].health==0)
		{
			ball[i].color=RED;
		}
		setfillcolor(ball[i].color);
		fillellipse(ball[i].x,ball[i].y,ball[i].r,ball[i].r);
	}
	Sleep(10); 
	cleardevice();
}

int main()
{
	cin>>num;
	startup();
	while(1)
	{
		is_ill();
	 	update();
		drawball();
	}
	getch();				
	closegraph();       
	return 0;
}