ZOJ Problem Set - 3512Financial Fraud

左偏树维护中位数。

低级错误：循环里的变量

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int n;
struct Node
{
       int x,dis,size;
       Node *l,*r;
       void clear()
       {
              l=r=NULL;
              dis=0;size=1;
       }
}a[50011];
bool check_dis(Node *A)
{
     if (A->r==NULL) return false;
     if (A->l==NULL) return true;
     return (A->r->dis>A->l->dis);

}
Node *merge(Node *A,Node *B)
{
     if (A==NULL) return B;
     if (B==NULL) return A;
     if (A->x<B->x) swap(A,B);
     A->r=merge(A->r,B);
     if (check_dis(A)) swap(A->l,A->r);
     if (A->r==NULL) A->dis=0;
     else A->dis=A->r->dis+1;
     A->size=1;
     if (A->l!=NULL) A->size+=A->l->size;
     if (A->r!=NULL) A->size+=A->r->size;
     return A;
}
Node *Q[50011];
int Qs[50011];
int num=0;
void fix(int i,int n)
{

     //cout<<n<<"**"<<endl;
     //system("pause");
     while (Q[i]->size>(n+1)/2)
     {
          //cout<<Q[i]->size<<endl;
          //system("pause");
          Q[i]=merge(Q[i]->l,Q[i]->r);

     }
}
inline int abs(int x) {return x<0?(-x):x;}
void init()
{
     for (int i=1;i<=n;i++)
     {
         a[i].clear();
         scanf("%d",&a[i].x);
     }
     num=1;Q[1]=&a[1];Qs[0]=0;Qs[1]=1;
     for (int i=2;i<=n;i++)
     {
         num++;
         Q[num]=&a[i];Qs[num]=i;
         while (num>1&&Q[num]->x<Q[num-1]->x)
         {
               Q[num-1]=merge(Q[num],Q[num-1]);

               //cout<<num<<" "<<Qs[num]<<" "<<Qs[num-1]<<endl;
               Qs[num-1]=Qs[num];num--;
               //cout<<num<<"OO"<<endl;
               fix(num,Qs[num]-Qs[num-1]);

               //system("pause");

         }
     }
     long long ans=0ll;
     for (int i=1;i<=num;i++)
     {
         for (int j=Qs[i-1]+1;j<=Qs[i];j++)
         {
             ans+=abs(a[j].x-Q[i]->x);
         }
     }
     //cout<<"*"<<num<<endl;
     //for (int i=1;i<=num;i++)
     //    cout<<Qs[i]<<"*"<<(Q[i]->x)<<" ";
     //cout<<endl;
     printf("%lld\n",ans);

}
int main()
{
    while (scanf("%d",&n),n!=0)
          init();

    return 0;
}