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谁帮我看一下,程序为什么一直wrong呢

Posted by MaBrad at 2010-05-27 18:24:57 on Problem 2573
#include<iostream>
using namespace std;
int main()
{
	int a[1000],n,s,b;
	s=0;
	cin>>n;
	int m=n;
	b=n;
	for(int i=0;i<n;i++)
	{
		
		cin>>a[i];
		if(a[i]>100)
			exit(0);

	}
	  if(n==1)	
	  {
		  cout<<a[0]<<endl;
	      cout<<a[0]<<endl;
	  }
	  else
	  {
	    for(int j=0;j<n-1;j++)
		for(int k=j+1;k<n;k++)
		{
			int temp;
			if(a[j]>a[k])
			{
				temp=a[j];
			    a[j]=a[k];
			    a[k]=temp;
			}
		}
 
   if(n==2)
  {
	  cout<<a[1]<<endl;
      cout<<a[0]<<" "<<a[1]<<endl;
  }
  
  else	if(n==3)
  {	
	  s=a[0]+a[1]+a[2];
	  cout<<s<<endl;
	  cout<<a[0]<<" "<<a[1]<<endl;
	  cout<<a[0]<<endl;
	  cout<<a[0]<<" "<<a[2]<<endl;

  }
  else
	{
	 while(n>2)
	{
		
	    s=s+a[0]+a[n-1]+2*a[1];
		n=n-2;	
       if(n==1)
	   s=s-a[1];
    	if(n==2)
		s=s+a[1];
	}	
	cout<<s<<endl;
	
	
	while(m>2)
	{
		cout<<a[0]<<" "<<a[1]<<endl;
		cout<<a[0]<<endl;
		cout<<a[m-2]<<" "<<a[m-1]<<endl;
		cout<<a[1]<<endl;
		m=m-2;
	}
	if(b>1)
	cout<<a[0]<<" "<<a[1]<<endl;
}
	  }
	  return s;
}

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