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  • Tyvj 1730 论我们有多少种方法调戏普通平衡树（其实是备忘录）

     题面不用贴了，做过的都知道……

    数组Treap

      1 #include<iostream>
  2 #include<cstdio>
  3 #include<cstdlib>
  4 using namespace std;
  5 struct node{
  6     int l,r,v,size,rnd,w;
  7 }tr[100005];
  8 int n,size,root,ans;
  9 void Update(int k)
 10 {
 11     tr[k].size=tr[tr[k].l].size+tr[tr[k].r].size+tr[k].w;
 12 }
 13 void Zig(int &k)//右旋 
 14 {
 15     int t=tr[k].l;tr[k].l=tr[t].r;tr[t].r=k;
 16     tr[t].size=tr[k].size;Update(k);k=t;
 17 }
 18 void Zag(int &k)//左旋 
 19 {
 20     int t=tr[k].r;tr[k].r=tr[t].l;tr[t].l=k;
 21     tr[t].size=tr[k].size;Update(k);k=t;
 22 }
 23 void Insert(int &k,int x)
 24 {
 25     if(!k)
 26     {
 27         size++;k=size;
 28         tr[k].size=tr[k].w=1;tr[k].v=x;tr[k].rnd=rand();
 29         return;
 30     }
 31     tr[k].size++;
 32     if(tr[k].v==x)tr[k].w++;
 33     else if(x>tr[k].v)
 34     {
 35         Insert(tr[k].r,x);
 36         if(tr[tr[k].r].rnd<tr[k].rnd)Zag(k);
 37     }
 38     else
 39     {
 40         Insert(tr[k].l,x);
 41         if(tr[tr[k].l].rnd<tr[k].rnd)Zig(k);
 42     }
 43 }
 44 void Del(int &k,int x)
 45 {
 46     if(!k)return;
 47     if(tr[k].v==x)
 48     {
 49         if(tr[k].w>1)
 50         {
 51             tr[k].w--;tr[k].size--;return;
 52         }
 53         if(tr[k].l*tr[k].r==0)k=tr[k].l+tr[k].r;
 54         else if(tr[tr[k].l].rnd<tr[tr[k].r].rnd)
 55         {
 56             Zig(k);
 57             Del(k,x);
 58         }
 59         else
 60         {
 61             Zag(k);
 62             Del(k,x);
 63         }
 64     }
 65     else if(x>tr[k].v)
 66     {
 67         tr[k].size--;
 68         Del(tr[k].r,x);
 69     }
 70     else
 71     {
 72         tr[k].size--;
 73         Del(tr[k].l,x);
 74     }
 75 }
 76 int Query_Rank(int k,int x)
 77 {
 78     if(!k)return 0;
 79     if(tr[k].v==x)return tr[tr[k].l].size+1;
 80     else if(x>tr[k].v)
 81         return tr[tr[k].l].size+tr[k].w+Query_Rank(tr[k].r,x);
 82     else return Query_Rank(tr[k].l,x);
 83 }
 84 int Query_Num(int k,int x)
 85 {
 86     if(!k)return 0;
 87     if(x<=tr[tr[k].l].size)return Query_Num(tr[k].l,x);
 88     else if(x>tr[tr[k].l].size+tr[k].w)
 89         return Query_Num(tr[k].r,x-tr[tr[k].l].size-tr[k].w);
 90     else return tr[k].v;
 91 }
 92 void Query_Pro(int k,int x)
 93 {
 94     if(!k)return;
 95     if(tr[k].v<x)
 96     {
 97         ans=k;
 98         Query_Pro(tr[k].r,x);
 99     }
100     else Query_Pro(tr[k].l,x);
101 }
102 void Query_Sub(int k,int x)
103 {
104     if(!k)return;
105     if(tr[k].v>x)
106     {
107         ans=k;
108         Query_Sub(tr[k].l,x);
109     }
110     else Query_Sub(tr[k].r,x);
111 }
112 int haha()
113 {
114     freopen("phs.in","r",stdin);
115     freopen("phs.out","w",stdout);
116     scanf("%d",&n);
117     int opt,x;
118     for(int i=1;i<=n;i++)
119     {
120         scanf("%d%d",&opt,&x);
121         switch(opt)
122         {
123             case 1:Insert(root,x);break;
124             case 2:Del(root,x);break;
125             case 3:printf("%d
",Query_Rank(root,x));break;
126             case 4:printf("%d
",Query_Num(root,x));break;
127             case 5:ans=0;Query_Pro(root,x);printf("%d
",tr[ans].v);break;
128             case 6:ans=0;Query_Sub(root,x);printf("%d
",tr[ans].v);break;
129         }
130     }
131     //while(1);
132 }
133 int MsZhangMingtao=haha();
134 int main(){;}
    Treap 数组

    指针Treap

      1 #include<iostream>
  2 #include<cstdio>
  3 #include<cstdlib>
  4 #include<cstring>
  5 using namespace std;
  6 #define ls(x) (x->ch[0])
  7 #define rs(x) (x->ch[1])
  8 #define size(x) ((x)?(x->size):(0))
  9 struct Treap
 10 {
 11     int size,key,v;
 12     Treap *ch[2];
 13     Treap(int x=0)
 14     {
 15         v=x;
 16         size=1;
 17         key=rand();
 18         ch[0]=ch[1]=NULL;
 19     }
 20 }*root;
 21 void Maintain(Treap *rt)
 22 {
 23     rt->size=size(ls(rt))+size(rs(rt))+1;
 24 }
 25 void Rotate(Treap* &rt,int d)
 26 {
 27     Treap *t=rt->ch[d^1];
 28     rt->ch[d^1]=t->ch[d];Maintain(rt);
 29     t->ch[d]=rt;Maintain(t);
 30     rt=t;
 31 }
 32 void Insert(Treap* &rt,int x)
 33 {
 34     if(!rt)
 35     {
 36         rt=new Treap(x);
 37         return;
 38     }
 39     int d=rt->v>x;
 40     Insert(rt->ch[d^1],x);
 41     Maintain(rt);
 42     if(rt->ch[d^1]->key>rt->key)Rotate(rt,d);
 43 }
 44 void Delete(Treap* &rt,int x)
 45 {
 46     if(rt->v==x)
 47     {
 48         if(ls(rt)&&rs(rt))
 49         {
 50             int d=ls(rt)->key>rs(rt)->key;
 51             Rotate(rt,d);
 52             Delete(rt->ch[d],x);
 53         }
 54         else
 55         {
 56             Treap *t=NULL;
 57             if(ls(rt))t=ls(rt);
 58             else t=rs(rt);
 59             delete rt;rt=t;
 60         }
 61     }
 62     else
 63     {
 64         int d=rt->v>x;
 65         Delete(rt->ch[d^1],x);
 66     }
 67     if(rt)Maintain(rt);
 68 }
 69 int Rank(int x)
 70 {
 71     Treap *rt=root;
 72     int res=0;
 73     while(rt)
 74     {
 75         if(x>rt->v)
 76         {
 77             res+=size(ls(rt))+1;
 78             rt=rs(rt);
 79         }
 80         else rt=ls(rt);
 81     }
 82     return res;
 83 }
 84 int Kth(int k)
 85 {
 86     Treap *rt=root;
 87     while(rt)
 88     {
 89         if(size(ls(rt))+1==k)return rt->v;
 90         if(size(ls(rt))+1>k)rt=ls(rt);
 91         else
 92         {
 93             k-=size(ls(rt))+1;
 94             rt=rs(rt);
 95         }
 96     }
 97     return 0;
 98 }
 99 int haha()
100 {
101     freopen("phs.in","r",stdin);
102     freopen("phs.out","w",stdout);
103     int n;scanf("%d",&n);
104     while(n--)
105     {
106         int opt,x;scanf("%d%d",&opt,&x);
107         switch(opt)
108         {
109             case 1:Insert(root,x);break;
110             case 2:Delete(root,x);break;
111             case 3:printf("%d
",Rank(x)+1);break;
112             case 4:printf("%d
",Kth(x));break;
113             case 5:printf("%d
",Kth(Rank(x)));break;
114             case 6:printf("%d
",Kth(Rank(x+1)+1));break;
115         }
116     }
117     //while(1);
118 }
119 int WormYuZhuohao=haha();
120 int main(){;}
    Treap 指针

     Splay

      1 #include<iostream>
  2 #include<cstdio>
  3 #include<cstring>
  4 #include<algorithm>
  5 using namespace std;
  6 #define ls(x) (x->ch[0])
  7 #define rs(x) (x->ch[1])
  8 #define fa(x) (x->pa)
  9 #define size(x) ((x) ? (x->size) : (0))
 10 const int INF=2000000000;
 11 struct SPlay
 12 {
 13     int size,val;
 14     SPlay *ch[2],*pa;
 15     SPlay(){};
 16     SPlay(int x=0)
 17     {
 18         size=1;val=x;
 19     }
 20 }*Root,*null;
 21 SPlay* Newnode(int x)
 22 {
 23     SPlay *y=new SPlay(x);
 24     y->ch[0]=y->ch[1]=y->pa=null;
 25     return y;
 26 }
 27 void Maintain(SPlay *t)
 28 {
 29     t->size=t->ch[0]->size+t->ch[1]->size+1;
 30 }
 31 int Rank(int x)
 32 {
 33     SPlay *rt=Root;
 34     int res=0;
 35     while(rt!=null)
 36     {
 37         if(x>rt->val)
 38         {
 39             res+=rt->ch[0]->size+1;
 40             rt=rt->ch[1];
 41         }
 42         else rt=rt->ch[0];
 43     }
 44     return res;
 45 }
 46 SPlay* Kth(int x)
 47 {
 48     SPlay *rt=Root;
 49     while(rt!=null)
 50     {
 51         if(rt->ch[0]->size+1==x)return rt;
 52         if(rt->ch[0]->size+1>x)rt=rt->ch[0];
 53         else
 54         {
 55             x-=rt->ch[0]->size+1;
 56             rt=rt->ch[1];
 57         }
 58     }
 59     return null;
 60 }
 61 int Islson(SPlay *x)
 62 {
 63     return x->pa->ch[0]==x;
 64 }
 65 void Rotate(SPlay *x,int d)
 66 {
 67     SPlay *y=x->ch[d^1];
 68     if(x->pa!=null)x->pa->ch[Islson(x)^1]=y;
 69     else Root=y;
 70     y->pa=x->pa;
 71     x->ch[d^1]=y->ch[d];
 72     if(y->ch[d]!=null)y->ch[d]->pa=x;
 73     y->ch[d]=x;
 74     x->pa=y;
 75     Maintain(x);Maintain(y);
 76 }
 77 void Splay(SPlay *x,SPlay *t=null)
 78 {
 79     for(SPlay *rt=x->pa;rt!=t;rt=x->pa)
 80     {
 81         if(rt->pa==t)
 82         {
 83             Rotate(rt,Islson(x));
 84             return;
 85         }
 86         if(Islson(x)==Islson(rt))Rotate(rt->pa,Islson(x));
 87         else Rotate(rt,Islson(x));
 88         Rotate(x->pa,Islson(x));
 89     }
 90 }
 91 void Insert(int x)
 92 {
 93     int pos=Rank(x);
 94     Splay(Kth(pos));Splay(Kth(pos+1),Root);
 95     SPlay *y=Newnode(x);
 96     Root->ch[1]->ch[0]=y;
 97     y->pa=Root->ch[1];
 98     Maintain(Root->ch[1]);Maintain(Root);
 99 }
100 void Delete(int x)
101 {
102     int pos=Rank(x)+1;
103     Splay(Kth(pos-1));Splay(Kth(pos+1),Root);
104     Root->ch[1]->ch[0]=null;
105     Maintain(Root->ch[1]);Maintain(Root);
106 }
107 int n;
108 int haha()
109 {
110     freopen("phs.in","r",stdin);
111     freopen("phs.out","w",stdout);
112     null=new SPlay(0);
113     null->size=0;
114     Root=Newnode(-INF);
115     rs(Root)=Newnode(INF);
116     rs(Root)->pa=Root;
117     scanf("%d",&n);
118     for(int i=1;i<=n;i++)
119     {
120         int opt,x;scanf("%d%d",&opt,&x);
121         switch(opt)
122         {
123             case 1:Insert(x);break;
124             case 2:Delete(x);break;
125             case 3:printf("%d
",Rank(x)-1+1);break;
126             case 4:printf("%d
",Kth(x+1)->val);break;
127             case 5:printf("%d
",Kth(Rank(x))->val);break;
128             case 6:printf("%d
",Kth(Rank(x+1)+1)->val);break;
129         }
130     }
131     //while(1);
132 }
133 int Zhizhangheng=haha();
134 int main(){;}
    Splay

    SBT

      1 #include<iostream>
  2 #include<cstdio>
  3 #include<cstdlib>
  4 #include<cstring>
  5 #include<algorithm>
  6 using namespace std;
  7 #define ls(x) (x->ch[0])
  8 #define rs(x) (x->ch[1])
  9 #define size(x) ((x) ? (x->size) : (0))
 10 struct SBT
 11 {
 12     int val,cnt,size;
 13     SBT *ch[2];
 14     SBT(int x)
 15     {
 16         cnt=1;size=1;val=x;
 17         ch[0]=ch[1]=NULL;
 18     }
 19     void Update()
 20     {
 21         size=cnt;
 22         if(ch[0])size+=ch[0]->size;
 23         if(ch[1])size+=ch[1]->size;
 24     }
 25 }*root;
 26 void Rotate(SBT* &rt,bool lr)
 27 {
 28     SBT *t=rt->ch[lr];
 29     rt->ch[lr]=t->ch[lr^1];t->ch[lr^1]=rt;rt=t;
 30     rt->ch[lr^1]->Update();rt->Update();
 31 }
 32 void Maintain(SBT* &rt)
 33 {
 34     if(!rt)return;
 35     if(!rt->ch[0]&&!rt->ch[1])return;
 36     if(!ls(rt))
 37     {
 38         if(rt->ch[1]->ch[0]||rt->ch[1]->ch[1])Rotate(rt,1);
 39         return;
 40     }
 41     if(!rs(rt))
 42     {
 43         if(rt->ch[0]->ch[0]||rt->ch[0]->ch[1])Rotate(rt,0);
 44         return;
 45     }
 46     if(size(rt->ch[0])<size(rt->ch[1]->ch[0]))
 47     {
 48         Rotate(rt->ch[1],0);
 49         Rotate(rt,1);
 50         Maintain(ls(rt));Maintain(rs(rt));
 51         return;
 52     }
 53     if(size(ls(rt) ) <size(rs(rs(rt) ) ) )
 54     {
 55         Rotate(rt,1);
 56         Maintain(rs(rt));Maintain(rt);
 57         return;
 58     }
 59     if(size(rs(rt) ) <size(ls(ls(rt) ) ) )
 60     {
 61         Rotate(rt,0);
 62         Maintain(ls(rt));Maintain(rt);
 63         return;
 64     }
 65     if(size(rs(rt) ) <size(rs(ls(rt) ) ) )
 66     {
 67         Rotate(ls(rt),1);
 68         Rotate(rt,0);
 69         Maintain(ls(rt));Maintain(rs(rt));
 70         return;
 71     }
 72 }
 73 void Insert(SBT* &rt,int x)
 74 {
 75     if(rt==NULL)
 76     {
 77         rt=new SBT(x);
 78         return;
 79     }
 80     if(x<rt->val)
 81     {
 82         Insert(ls(rt),x);
 83         rt->size++;
 84         Maintain(rt);
 85         return;
 86     }
 87     if(x>rt->val)
 88     {
 89         Insert(rs(rt),x);
 90         rt->size++;
 91         Maintain(rt);
 92         return;
 93     }
 94     rt->size++;rt->cnt++;
 95 }
 96 void Delete(SBT* &rt,int x)
 97 {
 98     if(x==rt->val)
 99     {
100         if(rt->cnt>1)
101         {
102             rt->cnt--;rt->size--;
103             return;
104         }
105         int k=0;bool ok=0,lr;
106         if(ls(rt))
107         {
108             k=size(ls(rt));
109             ok=1;lr=0;
110         }
111         if(rs(rt)&&size(rs(rt))>k)
112         {
113             ok=1;
114             lr=1;
115         }
116         if(!ok)
117         {
118             delete rt;rt=NULL;
119             return;
120         }
121         Rotate(rt,lr);Delete(rt->ch[lr^1],x);
122         rt->Update();
123         return;
124     }
125     if(x<rt->val)
126     {
127         Delete(ls(rt),x);
128         rt->Update();
129     }
130     else
131     {
132         Delete(rs(rt),x);
133         rt->Update();
134     }
135 }
136 int Kth(int x)
137 {
138     SBT *rt=root;
139     while(rt)
140     {
141         if(size(ls(rt))>=x)
142         {
143             rt=ls(rt);
144             continue;
145         }
146         if(size(ls(rt))+rt->cnt>=x)return rt->val;
147         else
148         {
149             x-=size(ls(rt))+rt->cnt;
150             rt=rs(rt);
151         }
152     }
153     return -1;
154 }
155 int Rank(int x)
156 {
157     SBT *rt=root;
158     int res=0;
159     while(rt)
160     {
161         if(x==rt->val)return res+size(ls(rt));
162         if(x<rt->val)rt=ls(rt);
163         else
164         {
165             res+=size(ls(rt))+rt->cnt;
166             rt=rs(rt);
167         }
168     }
169     return res;
170 }
171 int haha()
172 {
173     freopen("phs.in","r",stdin);
174     freopen("phs.out","w",stdout);
175     int n;scanf("%d",&n);
176     for(int i=1;i<=n;i++)
177     {
178         int opt,x;scanf("%d%d",&opt,&x);
179         switch(opt)
180         {
181             case 1:Insert(root,x);break;
182             case 2:Delete(root,x);break;
183             case 3:printf("%d
",Rank(x)+1);break;
184             case 4:printf("%d
",Kth(x));break;
185             case 5:printf("%d
",Kth(Rank(x)));break;
186             case 6:printf("%d
",Kth(Rank(x+1)+1));break;
187         }
188     }
189     //while(1);
190 }
191 int SBLVCHAO=haha();
192 int main(){;}
    SBT

    替罪羊树

      1 #include<iostream>
  2 #include<cstdio>
  3 #include<algorithm>
  4 #include<cstring>
  5 using namespace std;
  6 const int maxn=200005;
  7 const double alpha=0.75;
  8 struct Scapegoat_Tree
  9 {
 10     Scapegoat_Tree *ch[2];
 11     int key,size,cover,ext;
 12     void Update()
 13     {
 14         size=ch[0]->size+ch[1]->size+ext;
 15         cover=ch[0]->cover+ch[1]->cover+1;
 16     }
 17     bool bad()
 18     {
 19         return ch[0]->cover>=cover*alpha+5||ch[1]->cover>=cover*alpha+5;
 20     }
 21 }Mem[maxn],*null,*root;
 22 Scapegoat_Tree *Stack[maxn];int pnt;
 23 Scapegoat_Tree *lst[maxn];int len;
 24 inline void Init()
 25 {
 26     root=null=Mem;
 27     null->size=null->cover=0;
 28     null->ch[0]=null->ch[1]=null;
 29     for(int i=1;i<maxn;i++)Stack[++pnt]=Mem+i;
 30 }
 31 inline Scapegoat_Tree *New(int key)
 32 {
 33     Scapegoat_Tree *t=Stack[pnt--];
 34     t->ch[0]=t->ch[1]=null;
 35     t->size=t->cover=t->ext=1;
 36     t->key=key;
 37     return t;
 38 }
 39 inline void Travel(Scapegoat_Tree *p)
 40 {
 41     if(p==null)return;
 42     Travel(p->ch[0]);
 43     if(p->ext)lst[++len]=p;
 44     Travel(p->ch[1]);
 45 }
 46 inline Scapegoat_Tree* Divide(int l,int r)
 47 {
 48     if(l>r)return null;
 49     int mid=(l+r)>>1;
 50     lst[mid]->ch[0]=Divide(l,mid-1);
 51     lst[mid]->ch[1]=Divide(mid+1,r);
 52     lst[mid]->Update();
 53     return lst[mid];
 54 } 
 55 inline void Rebuild(Scapegoat_Tree* &p)
 56 {
 57     len=0;Travel(p);p=Divide(1,len);
 58 }
 59 inline Scapegoat_Tree **Insert(Scapegoat_Tree* &p,int key)
 60 {
 61     if(p==null)
 62     {
 63         p=New(key);
 64         return &null;
 65     }
 66     p->size++;p->cover++;
 67     Scapegoat_Tree **ret=Insert(p->ch[key>=p->key],key);
 68     if(p->bad())ret=&p;
 69     return ret;
 70 }
 71 inline void Delete(Scapegoat_Tree *p,int k)
 72 {
 73     p->size--;
 74     if(p->ext&&k==p->ch[0]->size+1)return void(p->ext=0);
 75     if(k<=p->ch[0]->size)Delete(p->ch[0],k);
 76     else Delete(p->ch[1],k-p->ch[0]->size-p->ext);
 77 }
 78 inline int Kth(int k)
 79 {
 80     Scapegoat_Tree *p=root;
 81     while(p!=null)
 82     {
 83         if(p->ext&&k==p->ch[0]->size+1)return p->key;
 84         else if(p->ch[0]->size>=k)p=p->ch[0];
 85         else
 86         {
 87             k-=p->ch[0]->size+p->ext;
 88             p=p->ch[1];
 89         }
 90     }
 91 }
 92 inline int Rank(int val)
 93 {
 94     Scapegoat_Tree *p=root;int ret=1;
 95     while(p!=null)
 96     {
 97         if(p->key>=val)p=p->ch[0];
 98         else
 99         {
100             ret+=p->ch[0]->size+p->ext;
101             p=p->ch[1];
102         }
103     }
104     return ret;
105 }
106 inline void Insert(int val)
107 {
108     Scapegoat_Tree **p=Insert(root,val);
109   if (*p!=null) Rebuild(*p);
110 }
111 void Erase_Kth(int k)
112 {
113     Delete(root,k);
114     if(root->size<alpha*root->cover)Rebuild(root);
115 }
116 void Erase(int k)
117 {
118     Erase_Kth(Rank(k));
119 }
120 int haha()
121 {
122     freopen("phs.in","r",stdin);
123     freopen("phs.out","w",stdout);
124     Init();
125     int n;scanf("%d",&n);
126     for(int i=1;i<=n;i++)
127     {
128         int opt,x;scanf("%d%d",&opt,&x);
129         switch(opt)
130         {
131             case 1:Insert(x);break;
132             case 2:Erase(x);break;
133             case 3:printf("%d
",Rank(x));break;
134             case 4:printf("%d
",Kth(x));break;
135             case 5:printf("%d
",Kth(Rank(x)-1));break;
136             case 6:printf("%d
",Kth(Rank(x+1)));break;
137         }
138     }
139 }
140 int sb=haha();
141 int main(){;}
    Scapegoat

    01Trie

     1 #include<iostream>
 2 #include<cstdio>
 3 #include<cstring>
 4 #include<algorithm>
 5 using namespace std;
 6 #define ls(x) (ch[x][0])
 7 #define rs(x) (ch[x][1])
 8 const int maxn=120000*24;
 9 int ch[maxn][2],size[maxn],cnt,root;
10 int n,fix,full;
11 void Insert(int x,int add)
12 {
13     x+=fix;int rt=root;
14     for(int i=full;~i;i--)
15     {
16         bool op=x>>i&1;
17         if(!ch[rt][op])ch[rt][op]=++cnt;
18         rt=ch[rt][op];
19         size[rt]+=add;
20     }
21 }
22 int Rank(int x)
23 {
24     x+=fix;
25     int res=0,rt=root;
26     for(int i=full;~i;i--)
27     {
28         bool op=x>>i&1;
29         if(op)
30         {
31             res+=size[ls(rt)];
32             rt=rs(rt);
33         }
34         else rt=ls(rt);
35     }
36     return res;
37 }
38 int Kth(int k)
39 {
40     int res=0,rt=root;
41     for(int i=full;~i;i--)
42     {
43         if(k>size[ls(rt)])
44         {
45             k-=size[ls(rt)];
46             res|=1<<i;
47             rt=rs(rt);
48         }
49         else rt=ls(rt);
50     }
51     return res-fix;
52 }
53 int haha()
54 {
55     freopen("phs.in","r",stdin);freopen("phs.out","w",stdout);
56     int n;scanf("%d",&n);
57     fix=1e7;full=24;
58     root=++cnt;
59     while(n--)
60     {
61         int opt,x;scanf("%d%d",&opt,&x);
62         switch(opt)
63         {
64             case 1:Insert(x,1);break;
65             case 2:Insert(x,-1);break;
66             case 3:printf("%d
",Rank(x)+1);break;
67             case 4:printf("%d
",Kth(x));break;
68             case 5:printf("%d
",Kth(Rank(x)));break;
69             case 6:printf("%d
",Kth(Rank(x+1)+1));break;
70         }
71     }
72 }
73 int sb=haha();
74 int main(){;}
    01 Trie

    无旋Treap

      1 #include<cstdio>
  2 #include<algorithm>
  3 #define r register
  4 namespace Treap
  5 {
  6     inline int rand()
  7     {
  8         static int x=23333;
  9         return x^=x<<13,x^=x>>17,x^=x<<5;
 10     }
 11     struct node
 12     {
 13         node *ch[2];
 14         int val,pri,sz;
 15         node(int val=0):val(val)//鍐欏?杈瑰氨瀵逛簡鈥︹€﹀ソ鐜勫?鍟娾€︹€
 16         {
 17             pri=rand();
 18             ch[0]=ch[1]=NULL;
 19             sz=1;
 20         }
 21         inline void update()
 22         {
 23             sz=1;
 24             if(ch[0])sz+=ch[0]->sz;
 25             if(ch[1])sz+=ch[1]->sz;
 26         }
 27     }*root;
 28     inline int size(node *x)
 29     {
 30         return x?x->sz:0;
 31     }
 32     node* merge(node *a,node *b)
 33     {
 34         if(!a)return b;if(!b)return a;
 35         if(a->pri<b->pri)
 36         {
 37             a->ch[1]=merge(a->ch[1],b);
 38             a->update();
 39             return a;
 40         }
 41         else
 42         {
 43             b->ch[0]=merge(a,b->ch[0]);
 44             b->update();
 45             return b;
 46         }
 47     }
 48     typedef std::pair<node*,node*>Npair;
 49     Npair split(node *x,int k)
 50     {
 51         if(!x)return Npair(NULL,NULL);
 52         r Npair y;
 53         if(size(x->ch[0])>=k)
 54         {
 55             y=split(x->ch[0],k);
 56             x->ch[0]=y.second;
 57             x->update();
 58             y.second=x;
 59         }
 60         else
 61         {
 62             y=split(x->ch[1],k-size(x->ch[0])-1);
 63             x->ch[1]=y.first;
 64             x->update();
 65             y.first=x;
 66         }
 67         return y;
 68     }
 69     inline int Kth(int k)
 70     {
 71         r Npair x=split(root,k-1);
 72         r Npair y=split(x.second,1);
 73         r node *ans=y.first;
 74         root=merge(merge(x.first,ans),y.second);
 75         return ans->val;
 76     }
 77     int Rank(node *x,int k)
 78     {
 79         if(!x)return 0;
 80         return k<x->val?Rank(x->ch[0],k):Rank(x->ch[1],k)+size(x->ch[0])+1;
 81     }
 82     inline void Insert(int val)
 83     {
 84         r int k=Rank(root,val);
 85         r Npair x=split(root,k);
 86         r node *a=new node(val);
 87         root=merge(merge(x.first,a),x.second);
 88     }
 89     inline void Delete(int val)
 90     {
 91         r int k=Rank(root,val);
 92         r Npair x=split(root,k-1);
 93         r Npair y=split(x.second,1);
 94         r node *ans=y.first;
 95         root=merge(x.first,y.second);
 96         delete ans;
 97         ans=NULL;
 98     }
 99     inline int prefix(int val)
100     {
101         r int k=Rank(root,val-1);
102         return Kth(k);
103     }
104     inline int suffix(int val)
105     {
106         r int k=Rank(root,val);
107         return Kth(k+1);
108     }
109 }
110 int haha()
111 {
112     freopen("phs.in","r",stdin);
113     freopen("phs.out","w",stdout);
114     int n;scanf("%d",&n);
115     while(n--)
116     {
117         r int opt,x;scanf("%d%d",&opt,&x);
118         switch(opt)
119         {
120             case 1:Treap::Insert(x);break;
121             case 2:Treap::Delete(x);break;
122             case 3:printf("%d
",Treap::Rank(Treap::root,x-1)+1);break;
123             case 4:printf("%d
",Treap::Kth(x));break;
124             case 5:printf("%d
",Treap::prefix(x));break;
125             case 6:printf("%d
",Treap::suffix(x));break;
126         }
127     }
128 }
129 int sb=haha();
130 int main(){;}
    Treap 无旋

    有没有哪位大神用别的水过的欢迎留言……

    只要是活着的东西，就算是神我也杀给你看。
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  • 原文地址：https://www.cnblogs.com/Loser-of-Life/p/7182668.html
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