boj 67 在世界中心呼唤爱

#include<stdio.h>
#include<stdlib.h>
struct node
{
       int data,leftnum,rightnum;
       node *left,*right;
};
void insert(node *a,node *b)
{
     if(a->data>b->data)
     {
       if(!a->left)a->left=b;
       else insert(a->left,b);
       a->leftnum++;
     }
     else
     {
       if(!a->right)a->right=b;
       else insert(a->right,b);
       a->rightnum++;
     }
}

int  findmid(node *root,int n)
{
    if(n-1==root->leftnum) return root->data;
    else if(n-1>root->leftnum)return findmid(root->right,n-root->leftnum-1);
    else return findmid(root->left,n);
}
main()
{
      int n,k,m;
      while(~scanf("%d",&n))
      {
           if(!n)break;
           k=1;
           double t;
           n--;
           node *root=(node*)malloc(sizeof(node));
           scanf("%d%d",&m,&root->data),root->left=0,root->right=0,root->leftnum=0,root->rightnum=0;
           while(n--)
           {
                scanf("%d",&m);
                if(m==1)
                {
                  k++;
                  node *p=(node*)malloc(sizeof(node));
                  scanf("%d",&p->data),p->left=0,p->right=0,p->leftnum=0,p->rightnum=0;
                  insert(root,p);
                }
                else if(m==2)
                {
                    if(k%2)t=findmid(root,(k+1)/2),printf("%.1lf\n",t);
                    else t=findmid(root,k/2)+findmid(root,k/2+1),printf("%.1lf\n",t/2);
                }
           }
      }
}