就是非旋treap的板子

#include<iostream>
#include<cstdio>
#include<cstdlib>
using namespace std;
const int N=500005,mod=73939133,bs=997687623;
int q,tot,rt,st=123;
struct qwe
{
int c[2],f,v,s,w;
}t[N];
int read()
{
int r=0,f=1;
char p=getchar();
while(p>'9'||p<'0')
{
if(p=='-')
f=-1;
p=getchar();
}
while(p>='0'&&p<='9')
{
r=r*10+p-48;
p=getchar();
}
return r*f;
}
int rand()
{
return st=1ll*st*bs%mod;
}
void ud(int x)
{
t[x].s=t[t[x].c[0]].s+t[t[x].c[1]].s+1;
}
int hb(int x,int y)
{
if(!x||!y)
return x+y;
if(t[x].w<t[y].w)
{
t[x].c[1]=hb(t[x].c[1],y);
ud(x);
return x;
}
else
{
t[y].c[0]=hb(x,t[y].c[0]);
ud(y);
return y;
}
}
void split(int x,int v,int &l,int &r)
{
if(!x)
{
l=r=0;
return;
}
if(t[x].v<=v)
l=x,split(t[x].c[1],v,t[x].c[1],r);
else
r=x,split(t[x].c[0],v,l,t[x].c[0]);
ud(x);
}
int kth(int x,int k)
{
while(1)
{
if(k<=t[t[x].c[0]].s)
x=t[x].c[0];
else if(k==t[t[x].c[0]].s+1)
return x;
else
k-=t[t[x].c[0]].s+1,x=t[x].c[1];
}
}
void charu(int x)
{
int a,b;
split(rt,x,a,b);
t[++tot].s=1,t[tot].v=x,t[tot].w=rand();
rt=hb(hb(a,tot),b);
}
void shanchu(int x)
{
int a,b,c;
split(rt,x,a,c);
split(a,x-1,a,b);
rt=hb(hb(a,hb(t[b].c[0],t[b].c[1])),c);
}
void rank(int x)
{
int a,b;
split(rt,x-1,a,b);
printf("%d\n",t[a].s+1);
rt=hb(a,b);
}
void real(int x)
{
printf("%d\n",t[kth(rt,x)].v);
}
void pre(int x)
{
int a,b;
split(rt,x-1,a,b);
printf("%d\n",t[kth(a,t[a].s)].v);
rt=hb(a,b);
}
void nxt(int x)
{
int a,b;
split(rt,x,a,b);
printf("%d\n",t[kth(b,1)].v);
rt=hb(a,b);
}
int main()
{
q=read();
while(q--)
{
int o=read();
if(o==1)
charu(read());
else if(o==2)
shanchu(read());
else if(o==3)
rank(read());
else if(o==4)
real(read());
else if(o==5)
pre(read());
else
nxt(read());
}
return 0;
}
05-19 06:34