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| #include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<queue>
#define re register
#define INF 0x7fffffff
#define ll long long
using namespace std;
int read()
{
int x = 0,f = 1; char ch;
ch = getchar();
while(ch >'9' || ch < '0'){if(ch == '-') f = -f; ch = getchar();}
while(ch >= '0' && ch <= '9'){x = x * 10 + ch - '0'; ch = getchar();}
return x * f;
}
struct node{
int fa,son[2],v,tie,siz;
}e[1000000];
int root,tot;
void rotate(int x)
{
int y = e[x].fa, z = e[y].fa, mode = 0;
if(e[z].son[0] == y) e[z].son[0] = x;
else e[z].son[1] = x;
e[x].fa = z;
if(e[y].son[0] == x) mode ++;
e[y].son[mode ^ 1] = e[x].son[mode];
e[e[x].son[mode]].fa = y;
e[x].son[mode] = y;
e[y].fa = x;
e[y].siz = e[e[y].son[0]].siz + e[e[y].son[1]].siz + e[y].tie;
e[x].siz = e[e[x].son[0]].siz + e[e[x].son[1]].siz + e[x].tie;
}
void splay(int x)
{
while(e[x].fa)
{
int y = e[x].fa, z = e[y].fa;
if(z)
{
if((e[y].son[0] == y) ^ (e[y].son[0] == x)) rotate(x);
else rotate(y);
}
rotate(x);
}
root = x;
}
int find(int now, int w)
{
while(e[now].v != w)
{
if(w < e[now].v)
{
if(e[now].son[0]) now = e[now].son[0];
else break;
}
else
{
if(e[now].son[1]) now = e[now].son[1];
else break;
}
}
return now;
}
void add(int f, int w)
{
e[++ tot].fa = f;
e[tot].tie = 1;
e[tot].siz = 1;
e[tot].v = w;
}
void ins(int p)
{
if(!tot)
{
add(0,p);
root = 1;
return ;
}
int pos = find(root,p);
if(e[pos].v == p) e[pos].tie ++;
else
{
add(pos,p);
if(p < e[pos].v) e[pos].son[0] = tot;
else e[pos].son[1] = tot;
}
for(int now = pos; now; ++e[now].siz,now = e[now].fa);
if(e[pos].v == p) splay(pos);
else splay(tot);
}
void del(int p)
{
int pos = find(root,p);
if(e[pos].v != p) return ;
splay(pos);
if(e[pos].tie > 1)
{
e[pos].tie --;
e[pos].siz --;
return ;
}
if(!e[pos].son[0])
{
e[e[pos].son[1]].fa = 0;
root = e[pos].son[1];
if(!root) tot = 0;
}
else
{
e[e[pos].son[0]].fa = 0;
int lax = find(e[pos].son[0],1000000);
splay(lax);
e[root].siz += e[e[pos].son[1]].siz;
e[root].son[1] = e[pos].son[1];
e[e[pos].son[1]].fa = root;
}
e[pos].v = 0;
e[pos].tie = 0;
e[pos].siz = 0;
e[pos].fa = 0;
e[pos].son[0] = 0;
e[pos].son[1] = 0;
}
int rank(int p)
{
int pos = find(root,p);
splay(pos);
return e[e[pos].son[0]].siz + 1;
}
int k_th(int p)
{
int now = root;
for(int bot = e[e[now].son[0]].siz; p <= bot || p > bot + e[now].tie; bot = e[e[now].son[0]].siz)
if(p > bot + e[now].tie)
{
p = p - bot - e[now].tie;
now = e[now].son[1];
}
else now = e[now].son[0];
return e[now].v;
}
int pred(int p)
{
int pos = find(root,p);
if(e[pos].v < p) return e[pos].v;
splay(pos);
return e[find(e[pos].son[0],10000000)].v;
}
int succ(int p)
{
int pos = find(root,p);
if(e[pos].v > p) return e[pos].v;
splay(pos);
return e[find(e[pos].son[1],0)].v;
}
int main()
{
int m,mode,x;
scanf("%d",&m);
while (m--)
{
scanf("%d%d",&mode,&x);
switch (mode)
{
case 1:ins(x);break;
case 2:del(x);break;
case 3:printf("%d\n",rank(x));break;
case 4:printf("%d\n",k_th(x));break;
case 5:printf("%d\n",pred(x));break;
case 6:printf("%d\n",succ(x));break;
}
}
return 0;
}
|
