树——二叉查找树 - 有删除动作

 代码：

#include
#include
#include
#include
using namespace std;
const int N=1e6+10;
int l[N],r[N];
int d[N],idx;
char a[7];
int n;
int h;
void intree(int x,int father)
{
        if(x>d[father])
        {
            if(r[father]==-1)
            {
                r[father]=++idx;
                d[idx]=x;
            }else
            {
                intree(x,r[father]);
            }
        }else if(x
        {
            if(l[father]==-1)
            {
                l[father]=++idx;
                d[idx]=x;
            }else
            {
                intree(x,l[father]);
            }
        }else
            return;
}
bool get(int x)
{
    int p=h;
    while(1)
    {
        if(x==d[p])return true;
        else if(x>d[p])
        {
            if(r[p]==-1)
            {
                return false;
            }else
            {
                p=r[p];
            }
        }else
        {
            if(l[p]==-1)
            {
                return false;
            }else
            {
                p=l[p];
            }
        }
    }
    return false;
}
int get_lmin(int p,int father)
{
    if(r[p]==-1)
    {
        if(l[father]==p)
        {
            l[father]=l[p];
        }else
        {
            r[father]=l[p];
        }
        return p;
    }else
    {
        return get_lmin(r[p], p);
    }
}
int get_rmin(int p,int father)
{
    if(l[p]==-1)
    {
        if(l[father]==p)
        {
            l[father]=r[p];
        }else
        {
            r[father]=r[p];
        }
        return p;
    }else
    {
        return get_rmin(l[p],p);
    }
}
void dele(int x,int p,int father)
{
    if(d[p]==x)
    {
        if(l[p]!=-1)
        {
            d[p]=d[get_lmin(l[p],p)];
 
        }else if(r[p]!=-1)
        {
            d[p]=d[get_rmin(r[p],p)];
        }else if(r[p]==-1&&l[p]==-1)
        {
            if(d[l[father]]==x)
            {
                l[father]=-1;
            }else
            {
                r[father]=-1;
            }
        }
    }else if(x>d[p])
    {
        dele(x,r[p],p);
    }else
    {
        dele(x,l[p],p);
    }
}
void output()
{
    queue<int>que;
    que.push(1);
    while(que.size())
    {
        int t=que.front();
        cout<' ';
        que.pop();
        if(l[t]!=-1)que.push(l[t]);
        if(r[t]!=-1)que.push(r[t]);
    }
}
int main()
{
    int b;
    h=0;
    d[h]=1e9;
    memset(d,0x3f,sizeof d);
    memset(l,-1,sizeof l);
    memset(r,-1,sizeof r);
    scanf("%d",&n);
    while(n--)
    {
      scanf("%s%d",a+1,&b);
      if(a[1]=='i')
      {
          intree(b,h);
      }else if(a[1]=='f')
      {
          if(get(b))
          {
              puts("yes");
          }else
          puts("no");
      }else
      {
         // output();
         // cout<
          dele(b,l[h],h);
          //output();
      }
    }
    return 0;
}