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请在ZOJ上过了的高手帮我看一下~为什么错

Posted by sasnzy at 2005-08-15 17:38:42 on Problem 2573
#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
  int n;
  while (cin>>n)
  {
      if (!n) {cout<<0<<endl;continue;}
      vector<int> t(n);                    //t记录每个人所需要的时间
      for (int i=0;i<n;i++)
          cin>>t[i];
      if (n==1) {cout<<t[0]<<endl;continue;}
      sort(t.begin(),t.end());             //将个人所需要的时间进行排序
      int useTime=0;                       //令最快的人耗时a
      int a=t[0];                          //次快的为b
      int b=t[1];
      while (n)
      {
          if (n==2) {useTime+=b;n=0;continue;}       //如果只剩2人(最快和次快的剩下)
          if (n==3) {useTime+=a+b+t[2];n=0;continue;}      //如果只剩3人
          if (n>=4)                                       //如果剩4人
          {
              int y=t[n-2];
              if (2*b>=a+y) {useTime+=t[n-1]+a*2+y;n-=2;}     //方案1
              else {useTime+=b*2+a+t[n-1];n-=2;}              //方案2
          }
      }
      cout<<useTime<<endl;
  }
}

我在ZOJ上不能AC~~但思路完全是按照书上的.....所有样例都正确....

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