调了好久，要崩溃了。
splay入门题
注意虚拟结点
并不知道为什么加了空间回收就要T三组？？？
1 #include<algorithm> 2 #include<iostream> 3 #include<cstdlib> 4 #include<cstring> 5 #include<cstdio> 6 #include<string> 7 #include<cmath> 8 #include<ctime> 9 #include<queue> 10 #include<stack> 11 #include<map> 12 #include<set> 13 #define rre(i,r,l) for(int i=(r);i>=(l);i--) 14 #define re(i,l,r) for(int i=(l);i<=(r);i++) 15 #define Clear(a,b) memset(a,b,sizeof(a)) 16 #define inout(x) printf("%d",(x)) 17 #define douin(x) scanf("%lf",&x) 18 #define strin(x) scanf("%s",(x)) 19 #define LLin(x) scanf("%lld",&x) 20 #define op operator 21 #define CSC main 22 typedef unsigned long long ULL; 23 typedef const int cint; 24 typedef long long LL; 25 using namespace std; 26 void inin(int &ret) 27 { 28 ret=0;int f=0;char ch=getchar(); 29 while(ch<'0'||ch>'9'){if(ch=='-')f=1;ch=getchar();} 30 while(ch>='0'&&ch<='9')ret*=10,ret+=ch-'0',ch=getchar(); 31 ret=f?-ret:ret; 32 } 33 int ch[160016][2],w[160016],s[160016],ed,fa[160016],wei[160016],root; 34 void maintain(int k){if(k)s[k]=s[ch[k][0]]+s[ch[k][1]]+1;} 35 void rotate(int x) 36 { 37 int y=fa[x],z=fa[y]; 38 if(z)ch[z][ch[z][1]==y]=x; 39 int l=ch[y][1]==x,r=l^1; 40 fa[y]=x,fa[x]=z; 41 if(ch[x][r])fa[ch[x][r]]=y; 42 ch[y][l]=ch[x][r],ch[x][r]=y; 43 maintain(y); 44 } 45 int newnode(int v,int f) 46 { 47 int ret=++ed; 48 s[ret]=1,w[ret]=v;fa[ret]=f; 49 ch[ret][0]=ch[ret][1]=0; 50 wei[v]=ret; 51 return ret; 52 } 53 int com(int k,int x) 54 { 55 int pp=s[ch[k][0]]+1; 56 if(x==pp)return -1; 57 return x<pp?0:1; 58 } 59 void splay(int x,int f) 60 { 61 if(!x)return ; 62 while(fa[x]!=f) 63 { 64 int y=fa[x],z=fa[y]; 65 if(z!=f) 66 if((ch[z][1]==y)^(ch[y][1]==x))rotate(x); 67 else rotate(y);else ; 68 rotate(x); 69 } 70 maintain(x); 71 if(!f)root=x; 72 } 73 int kth(int k) 74 { 75 int x=root; 76 while(x) 77 { 78 int pp=s[ch[x][0]]+1; 79 if(pp==k)return x; 80 if(pp<k)k-=pp,x=ch[x][1]; 81 else x=ch[x][0]; 82 }return 0; 83 } 84 int a[80080]; 85 int build(int f,int l,int r) 86 { 87 if(l>r)return 0; 88 int mid=(l+r)>>1; 89 int k=newnode(a[mid],f); 90 ch[k][0]=build(k,l,mid-1); 91 ch[k][1]=build(k,mid+1,r); 92 maintain(k);return k; 93 } 94 int split(int l,int r) 95 { 96 int x=kth(l-1),y=kth(r+1); 97 splay(x,0),splay(y,x); 98 return ch[y][0]; 99 } 100 int find(int k,int x) 101 { 102 if(!k)return 0; 103 int pp=s[ch[k][0]]; 104 if(x>pp+1)return find(ch[k][1],x-pp-1); 105 if(x<=pp)return find(ch[k][0],x); 106 else return k; 107 } 108 void Top(int x) 109 { 110 int L=find(root,2); 111 splay(L,0); 112 ch[ch[root][0]][1]=wei[x];fa[wei[x]]=ch[root][0]; 113 ch[wei[x]][0]=ch[wei[x]][1]=0; 114 maintain(wei[x]),maintain(ch[root][0]),maintain(root); 115 } 116 void B(int x) 117 { 118 int L=find(root,s[root]-1); 119 splay(L,0); 120 ch[ch[root][1]][0]=wei[x];fa[wei[x]]=ch[root][1]; 121 ch[wei[x]][0]=ch[wei[x]][1]=0; 122 maintain(wei[x]);maintain(ch[root][1]);maintain(root); 123 } 124 int maxi(int x) 125 { 126 if(!x)return 0; 127 while(ch[x][1])x=ch[x][1]; 128 return x; 129 } 130 void del(int x) 131 { 132 splay(wei[x],0);splay(maxi(ch[root][0]),0); 133 fa[ch[wei[x]][1]]=root;ch[root][1]=ch[wei[x]][1]; 134 maintain(root); 135 } 136 int n,m; 137 void print(int x) 138 { 139 if(!x)return ; 140 print(ch[x][0]); 141 printf("%d ",w[x]); 142 print(ch[x][1]); 143 } 144 int CSC() 145 { 146 freopen("in.in","r",stdin); 147 freopen("out.out","w",stdout); 148 inin(n),inin(m); 149 re(i,1,n)inin(a[i]); 150 root=build(0,0,n+1); 151 char opt[22]; 152 re(i,1,m) 153 { 154 strin(opt);int x;inin(x); 155 if(opt[0]=='T') 156 { 157 del(x); 158 Top(x); 159 } 160 if(opt[0]=='B') 161 { 162 del(x); 163 B(x); 164 } 165 if(opt[0]=='I') 166 { 167 int t;inin(t); 168 if(!t)continue; 169 int k=wei[x]; 170 splay(k,0); 171 int rank=s[ch[k][0]]+t; 172 del(x); 173 int L=find(root,rank),R=find(root,rank+1); 174 splay(L,0);splay(R,root); 175 ch[ch[root][1]][0]=wei[x];fa[wei[x]]=ch[root][1]; 176 ch[wei[x]][0]=ch[wei[x]][1]=0; 177 maintain(wei[x]);maintain(ch[root][1]);maintain(root); 178 } 179 if(opt[0]=='A') 180 { 181 int k=wei[x]; 182 splay(k,0); 183 int kk=s[ch[k][0]]-1; 184 printf("%d ",kk); 185 } 186 if(opt[0]=='Q') 187 { 188 int k=find(root,x+1); 189 splay(k,0); 190 printf("%d ",w[root]); 191 } 192 // print(root);cout<<" "; 193 } 194 return 0; 195 }