应一些人之邀。。。发一篇代码
1 #include <iostream> 2 #include <cstdio> 3 #include <cstdlib> 4 #include <cstring> 5 6 using namespace std; 7 struct node 8 { 9 int data; 10 int key; 11 node* ls; 12 node* rs; 13 int size; 14 15 node() 16 { 17 key=rand(); 18 } 19 }no[300010]; 20 21 void update(node* now) 22 { 23 now->size=1; 24 if (now->ls) now->size+=now->ls->size; 25 if (now->rs) now->size+=now->rs->size; 26 } 27 28 node* merge(node* a,node* b) 29 { 30 if (!a) {update(b);return b;} 31 if (!b) {update(a);return a;} 32 if (a->key<b->key) 33 { 34 a->rs=merge(a->rs,b); 35 update(a); 36 return a; 37 } 38 else 39 { 40 b->ls=merge(a,b->ls); 41 update(b); 42 return b; 43 } 44 } 45 46 struct nodepair 47 { 48 node* l; 49 node* r; 50 51 nodepair(node* a,node* b) 52 { 53 l=a; 54 r=b; 55 } 56 }; 57 58 nodepair split(node* a,int k) 59 { 60 if (!a) return nodepair(NULL,NULL); 61 if (a->data<=k) 62 { 63 nodepair km=split(a->rs,k); 64 a->rs=km.l; 65 update(a); 66 return nodepair(a,km.r); 67 } 68 else 69 { 70 nodepair km=split(a->ls,k); 71 a->ls=km.r; 72 update(a); 73 return nodepair(km.l,a); 74 } 75 } 76 77 nodepair splitTh(node* a,int k) 78 { 79 if (!a) return nodepair(NULL,NULL); 80 if (!k) return nodepair(NULL,a); 81 if (a->ls) 82 { 83 if (a->ls->size>=k) 84 { 85 nodepair km=splitTh(a->ls,k); 86 a->ls=km.r; 87 update(a); 88 return nodepair(km.l,a); 89 } 90 else 91 { 92 nodepair km=splitTh(a->rs,k-a->ls->size-1); 93 a->rs=km.l; 94 update(a); 95 return nodepair(a,km.r); 96 } 97 } 98 else 99 { 100 nodepair km=splitTh(a->rs,k-1); 101 a->rs=km.l; 102 update(a); 103 return nodepair(a,km.r); 104 } 105 } 106 107 int cnt=-1; 108 node* insert(node* root,int newdata) 109 { 110 node* q=&no[++cnt]; 111 q->data=newdata; 112 nodepair km=split(root,newdata); 113 return merge(km.l,merge(q,km.r)); 114 } 115 116 node* delate(node* root,int newdata) 117 { 118 nodepair km=split(root,newdata-1); 119 nodepair km2=splitTh(km.r,1); 120 return merge(km.l,km2.r); 121 } 122 123 int getKth(node* now,int k) 124 { 125 if (!now) return -123456789; 126 if (now->ls) 127 { 128 if (now->ls->size<k-1) 129 return getKth(now->rs,k-now->ls->size-1); 130 if (now->ls->size==k-1) 131 return now->data; 132 if (now->ls->size>k-1) 133 return getKth(now->ls,k); 134 } 135 else 136 { 137 if (k==1) return now->data; 138 return getKth(now->rs,k-1); 139 } 140 } 141 142 node* Search(node* root,int k,int* ans) 143 { 144 nodepair km=split(root,k-1); 145 if (km.l) 146 *ans=km.l->size+1; 147 else 148 *ans=1; 149 return merge(km.l,km.r); 150 } 151 152 node* getQQ(node* root,int data,int* ans) 153 { 154 nodepair km=split(root,data-1); 155 nodepair km2=splitTh(km.l,km.l->size-1); 156 *ans=km2.r->data; 157 return merge(km2.l,merge(km2.r,km.r)); 158 } 159 160 node* getHJ(node* root,int data,int* ans) 161 { 162 nodepair km=split(root,data); 163 nodepair km2=splitTh(km.r,1); 164 *ans=km2.l->data; 165 return merge(km.l,merge(km2.l,km2.r)); 166 } 167 168 int main() 169 { 170 node* root=NULL; 171 int n,cmd,k; 172 scanf("%d",&n); 173 for (int i=1;i<=n;++i) 174 { 175 scanf("%d%d",&cmd,&k); 176 if (cmd==1){root=insert(root,k);} 177 if (cmd==2){root=delate(root,k);} 178 if (cmd==3) 179 { 180 int ans=0; 181 root=Search(root,k,&ans); 182 printf("%d\n",ans); 183 } 184 if (cmd==4) 185 { 186 printf("%d\n",getKth(root,k)); 187 } 188 if (cmd==5) 189 { 190 int ans=0; 191 root=getQQ(root,k,&ans); 192 printf("%d\n",ans); 193 } 194 if (cmd==6) 195 { 196 int ans=0; 197 root=getHJ(root,k,&ans); 198 printf("%d\n",ans); 199 } 200 } 201 return 0; 202 }
