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不知道为什么排了序不行,暴搜反而可以...

Posted by yuanyirui at 2007-03-30 00:10:43 on Problem 2231
#include <stdio.h>
#include <iostream>
using namespace std;
int main()
{
  //  freopen("in.txt","r",stdin);
  //  freopen("out.txt","w",stdout);
    int a[10001],i,j,n;
    long long ans;
    while(scanf("%d",&n)!=EOF){
        for(i=0;i<n;i++) scanf("%d",&a[i]);
        ans=0;
        sort(a,a+n);
        for(i=0;i<n-1;i++) ans += (a[i+1]-a[i])*(i+1)*(n-i-1);
        cout<<ans*2<<endl;
    }
    return 1;
}
不行
#include <stdio.h>
#include <iostream.h>
int main()
{
   // freopen("in.txt","r",stdin);
   // freopen("out.txt","w",stdout);
    int a[10001],i,j,n;
    long long ans;
    while(scanf("%d",&n)!=EOF){
        for(i=0;i<n;i++) scanf("%d",&a[i]);
        ans=0;
        for(i=0;i<n;i++){
            for(j=i+1;j<n;j++){
                ans+=abs(a[i]-a[j]);
            }
        }
        cout<<ans*2<<endl;
    }
    return 1;
}
反而可以过

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