题意:有N个数字围成一个圈,有M个操作,操作类型有六种:(1)“add x",从当前指针位置开始的顺时针K2个数加上x。(2)"reverse",翻转,从当前指针指针位置开始的顺时针的K2个数。(3)"insert x",在当前指针位置的顺时候方向插入一个数x。(4)”delete“,删除当前指针所指的数。(5)"move x”,如果x=1,指针逆时针旋转,如果x=2,顺时针旋转。(6)“query",查询指针所指向的数的值。
Splay的作法就不说了。还可以有三个双端队列加两个标记搞定,方法,是第一个双端队列que1维护前K1个数,第二个que2维护第K1+1到第K2个数,第三个que3维护接下的数,标记add,表示que1和que2里的数要加上多少,标记head,表示que1是否被翻转过。
Splay(姿势1):
#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <set>
#include <map>
using namespace std;
typedef long long LL;
typedef pair<int,int> PII;
#define LL(x) (ch[x][0])
#define RR(x) (ch[x][1])
#define Kt (ch[ ch[Rt][1] ][0])
#define MID(a,b) (a+((b-a)>>1))
const int N=1e6+5;
int n,m,k1,k2;
int a[N/2];
struct SplayTree
{
int Rt,top;
int pre[N],sz[N],ch[N][2];
int key[N],add[N],pos;
bool flip[N];
inline void Link(int x,int y,int f)
{
pre[x]=y; if(y) ch[y][f]=x;
}
inline void Rotate(int x,int f)
{
int y=pre[x],z=pre[y];
PushDown(y); PushDown(x);
Link(x,z,RR(z)==y);
Link(ch[x][f],y,!f);
Link(y,x,f);
PushUp(y);
}
inline void Splay(int x,int goal)
{
while(pre[x]!=goal)
{
int y=pre[x],z=pre[y];
int cx=(LL(y)==x),cy=(LL(z)==y);
if(z==goal) Rotate(x,cx);
else
{
if(cx==cy) Rotate(y,cy);
else Rotate(x,cx);
Rotate(x,cy);
}
}
PushUp(x);
if(goal==0) Rt=x;
}
inline void Select(int K,int goal)
{
int x=Rt;
PushDown(x);
while(1)
{
if(sz[LL(x)]>=K) x=LL(x);
else if(sz[LL(x)]+1==K) break;
else K-=sz[LL(x)]+1,x=RR(x);
PushDown(x);
}
Splay(x,goal);
}
inline void fun_add(int x,int valu)
{
add[x]+=valu;
key[x]+=valu;
}
inline void fun_flip(int x)
{
flip[x]^=1;
swap(LL(x),RR(x));
}
inline void PushDown(int x)
{
if(add[x])
{
fun_add(LL(x),add[x]);
fun_add(RR(x),add[x]);
add[x]=0;
}
if(flip[x])
{
fun_flip(LL(x));
fun_flip(RR(x));
flip[x]=0;
}
}
inline void PushUp(int x)
{
sz[x]=1+sz[LL(x)]+sz[RR(x)];
}
inline void Add(int x)
{
Select(1,0); Select(k2+2,Rt);
fun_add(Kt,x);
}
inline void Reverse()
{
Select(1,0); Select(k1+2,Rt);
fun_flip(Kt);
}
inline void Insert(int x,int pos)
{
Select(pos,0); Select(pos+1,Rt);
addNode(x,Kt,RR(Rt));
PushUp(RR(Rt)); PushUp(Rt);
}
inline int Delete(bool top)
{
int valu;
if(top)
{
Select(1,0); Select(3,Rt);
valu=key[Kt];
Kt=0;
PushUp(RR(Rt)); PushUp(Rt);
}
else
{
int len=sz[Rt];
Select(len-2,0);Select(len,Rt);
valu=key[Kt];
Kt=0;
PushUp(RR(Rt)); PushUp(Rt);
}
return valu;
}
inline void Move(int x)
{
if(x==1)
{
int valu=Delete(0);
Insert(valu,1);
}
else
{
int valu=Delete(1);
Insert(valu,sz[Rt]-1);
}
}
inline void Query()
{
Select(2,0);
printf("%d\n",key[Rt]);
}
// void Debug(){ printf("Rt:%d\n",Rt); Travel(Rt); }
// void Travel(int x)
// {
// if(x==0) return;
//
// PushDown(x);
// Travel(LL(x));
// printf("node:%d,pre:%d,sz:%d,LL:%d,RR:%d,key:%d\n",
// x,pre[x],sz[x],LL(x),RR(x),key[x]);
// Travel(RR(x));
// }
void addNode(int valu,int &x,int f)
{
x=++top;
pre[x]=f; sz[x]=1; LL(x)=RR(x)=0;
key[x]=valu; add[x]=flip[x]=0;
}
void build(int lft,int rht,int &x,int f)
{
if(lft>rht) return;
int mid=MID(lft,rht);
addNode(a[mid],x,f);
build(lft,mid-1,LL(x),x);
build(mid+1,rht,RR(x),x);
PushUp(x);
}
void init()
{
Rt=top=0;
pre[0]=sz[0]=LL(0)=RR(0)=0;
addNode(0,Rt,0); addNode(0,RR(Rt),Rt);
build(0,n-1,Kt,RR(Rt));
PushUp(RR(Rt)); PushUp(Rt);
}
}spt;
int main()
{
int t_cnt=0;
while(scanf("%d%d%d%d",&n,&m,&k1,&k2)!=EOF)
{
if(n==0&&m==0&&k1==0&&k2==0) break;
for(int i=0;i<n;i++) scanf("%d",&a[i]);
spt.init();
printf("Case #%d:\n",++t_cnt);
char op[100]; int x;
while(m--)
{
scanf("%s",op);
if(op[0]=='a')
{
scanf("%d",&x); spt.Add(x);
}
else if(op[0]=='r') spt.Reverse();
else if(op[0]=='i')
{
scanf("%d",&x); spt.Insert(x,2);
}
else if(op[0]=='d') spt.Delete(1);
else if(op[0]=='m')
{
scanf("%d",&x); spt.Move(x);
}
else spt.Query();
}
}
return 0;
}
Spaly(姿势2):
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
#define LL(x) (ch[x][0])
#define RR(x) (ch[x][1])
#define Kt (ch[ ch[Rt][1] ][0])
#define MID(a,b) (a+((b-a)>>1))
const int N=1e6+5;
int a[N/2];
int n,m,K1,K2,pos;
struct SplayTree
{
int Rt,top;
int sz[N],pre[N],ch[N][2];
bool flip[N];
int key[N],add[N];
inline void Link(int x,int y,int f)
{
pre[x]=y; if(y) ch[y][f]=x;
}
inline void Rotate(int x,int f)
{
int y=pre[x],z=pre[y];
PushDown(y); PushDown(x);
Link(x,z,RR(z)==y);
Link(ch[x][f],y,!f);
Link(y,x,f);
PushUp(y);
}
inline void Splay(int x,int goal)
{
while(pre[x]!=goal)
{
int y=pre[x],z=pre[y];
int cx=(LL(y)==x),cy=(LL(z)==y);
if(z==goal) Rotate(x,cx);
else
{
if(cx==cy) Rotate(y,cy);
else Rotate(x,cx);
Rotate(x,cy);
}
}
PushUp(x);
if(goal==0) Rt=x;
}
inline void Select(int K,int goal)
{
int x=Rt;
PushDown(x);
while(1)
{
if(sz[LL(x)]>=K) x=LL(x);
else if(1+sz[LL(x)]==K) break;
else K-=sz[LL(x)]+1,x=RR(x);
PushDown(x);
}
Splay(x,goal);
}
inline void fun_add(int x,int valu)
{
key[x]+=valu;
add[x]+=valu;
}
inline void fun_flip(int x)
{
flip[x]^=1;
swap(LL(x),RR(x));
}
inline void PushUp(int x)
{
sz[x]=1+sz[LL(x)]+sz[RR(x)];
}
inline void PushDown(int x)
{
if(add[x])
{
fun_add(LL(x),add[x]);
fun_add(RR(x),add[x]);
add[x]=0;
}
if(flip[x])
{
fun_flip(LL(x)); fun_flip(RR(x));
flip[x]=0;
}
}
inline void Add(int st,int ed,int valu)
{
Select(st-1,0); Select(ed+1,Rt);
fun_add(Kt,valu);
}
inline void Reverse(int st,int ed)
{
Select(st-1,0); Select(ed+1,Rt);
fun_flip(Kt);
}
inline void Insert(int pos,int valu)
{
Select(pos,0); Select(pos+1,Rt);
addNode(valu,Kt,RR(Rt));
PushUp(RR(Rt)); PushUp(Rt);
}
inline void Delete(int pos)
{
Select(pos-1,0); Select(pos+1,Rt);
Kt=0; PushUp(RR(Rt)); PushUp(Rt);
}
inline void Query(int pos)
{
Select(pos,0);
printf("%d\n",key[Rt]);
}
inline void Move(int len)
{
pos-=len;
Select(1,0); Select(2+len,Rt);
int r1=Kt; Kt=0;
PushUp(RR(Rt)); PushUp(Rt);
Select(sz[Rt]-1,0); Select(sz[Rt],Rt);
Link(r1,RR(Rt),0);
PushUp(RR(Rt)); PushUp(Rt);
}
inline void addNode(int valu,int &x,int f)
{
x=++top;
sz[x]=1; pre[x]=f; LL(x)=RR(x)=0;
key[x]=valu; add[x]=flip[x]=0;
}
void build(int lft,int rht,int &x,int f)
{
if(lft>rht) return;
int mid=MID(lft,rht);
addNode(a[mid],x,f);
build(lft,mid-1,LL(x),x);
build(mid+1,rht,RR(x),x);
PushUp(x);
}
void init()
{
Rt=top=0;
addNode(0,Rt,0); addNode(0,RR(Rt),Rt);
build(0,n-1,Kt,RR(Rt));
PushUp(RR(Rt)); PushUp(Rt);
}
// void Debug(){ printf("Rt:%d\n",Rt); Travel(Rt); }
// void Travel(int x)
// {
// if(x==0) return;
// PushDown(x);
// Travel(LL(x));
// printf("node:%d,sz:%d,pre:%d,LL:%d,RR:%d,key:%d\n",
// x,sz[x],pre[x],LL(x),RR(x),key[x]);
// Travel(RR(x));
// }
}spt;
void deal(int &pos,int len)
{
if(pos<=1) pos=len-1;
if(pos>=len) pos=2;
}
int main()
{
freopen("in.txt","r",stdin);
int t_cnt=0;
while(scanf("%d%d%d%d",&n,&m,&K1,&K2)!=EOF)
{
if(n==0&&m==0&&K1==0&&K2==0) break;
for(int i=0;i<n;i++) scanf("%d",&a[i]);
spt.init(); pos=2;
printf("Case #%d:\n",++t_cnt);
char op[100]; int x;
while(m--)
{
int len=spt.sz[spt.Rt];
scanf("%s",op);
if(op[0]=='a')
{
scanf("%d",&x);
if(pos+K2>len) spt.Move(pos+K2-len);
spt.Add(pos,pos+K2-1,x);
}
else if(op[0]=='r')
{
if(pos+K1>=len) spt.Move(pos+K1-len);
spt.Reverse(pos,pos+K1-1);
}
else if(op[0]=='i')
{
scanf("%d",&x); spt.Insert(pos,x);
}
else if(op[0]=='d')
{
spt.Delete(pos);
deal(pos,spt.sz[spt.Rt]);
}
else if(op[0]=='m')
{
scanf("%d",&x);
if(x==1) pos--;
else pos++;
deal(pos,len);
}
else if(op[0]=='q') spt.Query(pos);
// spt.Debug();
}
}
return 0;
}
三个双端队列:
#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <set>
#include <map>
using namespace std;
typedef long long LL;
typedef pair<int,int> PII;
const int N=1e5+5;
int n,m,k1,k2;
int a[N];
struct Looploop
{
deque<int> que1,que2,que3;
int add,head;
void init()
{
add=0; head=1;
while(!que1.empty()) que1.pop_back();
while(!que2.empty()) que2.pop_back();
while(!que3.empty()) que3.pop_back();
for(int i=0;i<k1;i++) que1.push_back(a[i]);
for(int i=k1;i<k2;i++) que2.push_back(a[i]);
for(int i=k2;i<n ;i++) que3.push_back(a[i]);
}
void Add(int x){ add+=x; }
void Reverse() { head=!head; }
void Insert(int x)
{
if(head)
{
que3.push_back(que1.front()+add); que1.pop_front();
que1.push_front(x-add);
}
else
{
que3.push_back(que1.back()+add); que1.pop_back();
que1.push_back(x-add);
}
Move(1);
}
void Delete()
{
if(head)
{
que1.pop_front();
que1.push_back(que2.front());
}
else
{
que1.pop_back();
que1.push_front(que2.front());
}
que2.pop_front();
que2.push_back(que3.front()-add);
que3.pop_front();
}
void Move(int x)
{
if(x==2)
{
if(head)
{
que3.push_back(que1.front()+add); que1.pop_front();
que2.push_back(que3.front()-add); que3.pop_front();
que1.push_back(que2.front()); que2.pop_front();
}
else
{
que3.push_back(que1.back()+add); que1.pop_back();
que2.push_back(que3.front()-add); que3.pop_front();
que1.push_front(que2.front()); que2.pop_front();
}
}
else
{
if(head)
{
que1.push_front(que3.back()-add); que3.pop_back();
que2.push_front(que1.back()); que1.pop_back();
que3.push_front(que2.back()+add); que2.pop_back();
}
else
{
que1.push_back(que3.back()-add); que3.pop_back();
que2.push_front(que1.front()); que1.pop_front();
que3.push_front(que2.back()+add); que2.pop_back();
}
}
}
void query()
{
if(head) printf("%d\n",que1.front()+add);
else printf("%d\n",que1.back()+add);
}
void Display()
{
printf("head:%d,add:%d\n",head,add);
printf("que1: ");
int len=(int)que1.size();
if(head)
{
for(int i=0;i<len;i++) printf("%d ",que1[i]+add);puts("");
}
else
{
for(int i=len-1;i>=0;i--) printf("%d ",que1[i]+add);puts("");
}
printf("que2: ");
len=(int)que2.size();
for(int i=0;i<len;i++) printf("%d ",que2[i]+add);puts("");
printf("que3: ");
len=(int)que3.size();
for(int i=0;i<len;i++) printf("%d ",que3[i]);puts("");
}
}loop;
int main()
{
int t_cnt=0;
while(scanf("%d%d%d%d",&n,&m,&k1,&k2)!=EOF)
{
if(n==0&&m==0&&k1==0&&k2==0) break;
for(int i=0;i<n;i++) scanf("%d",&a[i]);
loop.init();
printf("Case #%d:\n",++t_cnt);
int tmp;
char op[100];
while(m--)
{
scanf("%s",op);
if(op[0]=='a')
{
scanf("%d",&tmp);
loop.Add(tmp);
}
else if(op[0]=='r') loop.Reverse();
else if(op[0]=='i')
{
scanf("%d",&tmp);
loop.Insert(tmp);
}
else if(op[0]=='d') loop.Delete();
else if(op[0]=='m')
{
scanf("%d",&tmp);
loop.Move(tmp);
}
else loop.query();
}
}
return 0;
}