TEST

Posted 2021-12-24 hzoi-yzh

不会写红论文qwq

#include<cstdio>
#include<cmath>
#include<ctime>
#include<cstdlib>
#include<cstring>
#include<algorithm>
#define ls tr[x].ch[0]
#define rs tr[x].ch[1]
#define ds tr[x].ch[d]
#define reg register
#define inf 0x6fffffff
#define F(i,a,b) for(i=a;i<=b;++i)
using namespace std;
int cnt,rt,line,MIN;
struct TREAP
    int ch[2],w,siz,cnt,rd;
tr[1000005];
void up(int x)

    tr[x].siz=tr[ls].siz+tr[rs].siz+tr[x].cnt;

void rot(int &x,int d)

    int son=ds;
    ds=tr[son].ch[d^1];
    tr[son].ch[d^1]=x;
    up(x);
    up(x=son);

void in(int &x,int w)

    if(!x)
    
        x=++cnt;                                        //
        tr[x].siz=tr[x].cnt=1;
        tr[x].w=w;
        tr[x].rd=rand();
        return;
    
    tr[x].siz++;
    if(tr[x].w==w)
        tr[x].cnt++;return;
    
    int d=w>tr[x].w;
    in(ds,w);
    if(tr[x].rd>tr[ds].rd) rot(x,d);

void del(int &x,int w)

    if(!x) return;
    if(tr[x].w==w)
    
        if(tr[x].cnt>1)
        
            tr[x].cnt--;
            tr[x].siz--;
            return;
        
        int d=tr[ls].rd>tr[rs].rd;
        if(ls==0||rs==0) x=ls+rs;
        else rot(x,d),del(x,w);
    
    else tr[x].siz--,del(tr[x].ch[tr[x].w<w],w);

void dfs(int x)

    if(ls) dfs(ls);
    if(rs) dfs(rs);
    if(MIN+line>tr[x].w)
    
        int t=tr[x].cnt;            //
        while(t--)
            del(rt,tr[x].w);
    

int kth(int x,int k)

    while(x)
    
        if(k<=tr[ls].siz) x=ls;
        else if(k>tr[x].cnt+tr[ls].siz) k-=tr[x].cnt+tr[ls].siz,x=rs;
        else return tr[x].w;
    

int main()

    char s[5];
    srand(time(0));
    int n;
    scanf("%d%d",&n,&MIN);
    reg int x,num=0;
    while(n--)
    
        scanf("%s %d",s,&x);
        if(s[0]==‘I‘)
        
            if(x>=MIN)
                in(rt,x+line),++num;
        
        else if(s[0]==‘A‘)
            line-=x;
        else if(s[0]==‘S‘)
        
            line+=x;
            dfs(rt);
        
        else
        
            if(tr[rt].siz<x)
                printf("-1\n");
            else
                printf("%d\n",kth(rt,tr[rt].siz-x+1)-line);
        
    
    printf("%d",num-tr[rt].siz);
    return 0;