新学的，其实吧，就那么回事....
看了几天，splay处理序列问题，真的非常厉害，翻转，插入，删除，线段树实现不了的功能，splay用起来很方便。
这题基本就是检验模板的题，各种操作都有，错了好多次，发现以前写的代码有错了的，数据水点，给水过了，注意pushup。
Splay模板
#include <cstdio>
#include <cstring>
#include <map>
#include <algorithm>
#include <iostream>
using namespace std;
#define N 500000
#define INF 0x7FFFFFFF
#define keyTree (ch[ ch[root][1] ][0])
int pre[N];
int lz[N];
int rev[N];
int ch[N][];
int val[N];
int minz[N];
int sz[N];
int num[N];
int root,t;
void pushup(int x)
{
minz[x] = min(val[x],min(minz[ch[x][]],minz[ch[x][]]));
sz[x] = sz[ch[x][]] + sz[ch[x][]] + ;
}
void Update_Rev(int x)
{
if(!x) return ;
swap(ch[x][],ch[x][]);
rev[x] ^= ;
}
void Update_Add(int x,int d)
{
if(!x) return ;
val[x] += d;
minz[x] += d;
lz[x] += d;
}
void pushdown(int x)
{
if(lz[x])
{
Update_Add(ch[x][],lz[x]);
Update_Add(ch[x][],lz[x]);
lz[x] = ;
}
if(rev[x])
{
Update_Rev(ch[x][]);
Update_Rev(ch[x][]);
rev[x] = ;
}
}
void NewNode(int &x,int c)
{
x = ++t;
ch[x][] = ch[x][] = ;
sz[x] = ;
lz[x] = rev[x] = ;
minz[x] = val[x] = c;
}
void makeTree(int &x,int l,int r,int rt)
{
if(l > r) return ;
int m;
m = (l + r)>>;
NewNode(x,num[m]);
makeTree(ch[x][],l,m-,x);
makeTree(ch[x][],m+,r,x);
pre[x] = rt;
pushup(x);
}
void Rotate(int x,int flag)//左旋 右旋
{
int y = pre[x];
pushdown(y);
pushdown(x);
ch[y][!flag] = ch[x][flag];
pre[ch[x][flag]] = y;
pre[x] = pre[y];
if(pre[x])
ch[pre[y]][ ch[pre[y]][] == y] = x;
ch[x][flag] = y;
pre[y] = x;
pushup(y);
}
void splay(int x,int goal)//把x转到goal下面
{
int y,z,flag;
while(pre[x] != goal)
{
if(pre[pre[x]] == goal)
{
pushdown(pre[x]);
pushdown(x);
Rotate(x,ch[pre[x]][] == x);
}
else
{
y = pre[x];
z = pre[y];
pushdown(z);
pushdown(y);
pushdown(x);
flag = (ch[z][] == y);
if(ch[y][flag] == x)
{
Rotate(x,!flag);
Rotate(x,flag);
}
else
{
Rotate(y,flag);
Rotate(x,flag);
}
}
}
pushup(x);
if(goal == ) root = x;
}
void RotateTo(int k,int goal)//将第k个，转到goal下面
{
int x = root;
pushdown(x);
while(sz[ch[x][]] != k)
{
if(k < sz[ch[x][]])
{
x = ch[x][];
}
else
{
k -= (sz[ch[x][]] + );
x = ch[x][];
}
pushdown(x);
}
splay(x,goal);
}
void init(int n)
{
root = t = ;
ch[][] = ch[][] = lz[] = pre[] = ;
val[] = minz[] = ;
rev[] = sz[] = ;//初始化
NewNode(root,-);
NewNode(ch[root][],-);
pre[t] = root;
int i;
for(i = ; i < n; i ++)
{
scanf("%d",&num[i]);
}
makeTree(keyTree,,n-,ch[root][]);//建树
pushup(ch[root][]);
pushup(root);
}
int main()
{
int n,i,x,y,d,m;
char str[];
scanf("%d",&n);
init(n);
scanf("%d",&m);
for(i = ; i < m; i ++)
{
scanf("%s",str);
if(strcmp(str,"ADD") == )
{
scanf("%d%d%d",&x,&y,&d);
RotateTo(x-,);
RotateTo(y+,root);
Update_Add(keyTree,d);
pushup(ch[root][]);
pushup(root);
}
else if(strcmp(str,"INSERT") == )//插入
{
scanf("%d%d",&x,&y);
RotateTo(x,);
RotateTo(x+,root);
NewNode(keyTree,y);
pre[keyTree] = ch[root][];
pushup(ch[root][]);
pushup(root);
}
else if(strcmp(str,"DELETE") == )//删除
{
scanf("%d",&x);
RotateTo(x-,);
RotateTo(x+,root);
pre[keyTree] = ;
keyTree = ;
pushup(ch[root][]);
pushup(root);
}
else if(strcmp(str,"MIN") == )//最值
{
scanf("%d%d",&x,&y);
RotateTo(x-,);
RotateTo(y+,root);
printf("%d\n",minz[keyTree]);
}
else if(strcmp(str,"REVOLVE") == )//右移t位
{
int t,temp;
scanf("%d%d%d",&x,&y,&t);
if(x > y) swap(x,y);
t = t%(y-x+);
if(t < ) t += (y-x+);
if(t == ) continue;
RotateTo(y-t,);
RotateTo(y+,root);
temp = keyTree;
keyTree = ;
RotateTo(x-,);
RotateTo(x,root);
keyTree = temp;
pre[keyTree] = ch[root][];
pushup(ch[root][]);
pushup(root);
}
else
{
scanf("%d%d",&x,&y);//翻转区间
if(x > y) swap(x,y);
RotateTo(x-,);
RotateTo(y+,root);
Update_Rev(keyTree);
pushup(ch[root][]);
pushup(root);
}
}
return ;
}
这题是现场赛的题目啊...非常麻烦，不过想好了，就没什么了，主要是翻转哪里。
#include <cstdio>
#include <cstring>
#include <map>
#include <algorithm>
#include <iostream>
using namespace std;
#define N 300000
#define INF 0x7FFFFFFF
#define keyTree (ch[ ch[root][1] ][0])
int ch[N][];
int pre[N];
int val[N];
int lz[N];
int sz[N];
int rev[N];
int num[N];
int root,t;
void Update_Add(int x,int d)
{
if(!x) return ;
lz[x] += d;
val[x] += d;
}
void Update_Rev(int x)
{
if(!x) return ;
swap(ch[x][],ch[x][]);
rev[x] ^= ;
}
void pushdown(int x)
{
if(lz[x])
{
Update_Add(ch[x][],lz[x]);
Update_Add(ch[x][],lz[x]);
lz[x] = ;
}
if(rev[x])
{
Update_Rev(ch[x][]);
Update_Rev(ch[x][]);
rev[x] = ;
}
}
void pushup(int x)
{
sz[x] = sz[ch[x][]] + sz[ch[x][]] + ;
}
void NewNode(int &x,int c,int fa)
{
x = ++t;
ch[x][] = ch[x][] = ;
lz[x] = rev[x] = ;
sz[x] = ;
val[x] = c;
pre[x] = fa;
}
void makeTree(int &x,int l,int r,int rt)
{
if(l > r) return ;
int m = (l + r)>>;
NewNode(x,num[m],rt);
makeTree(ch[x][],l,m-,x);
makeTree(ch[x][],m+,r,x);
pushup(x);
}
void Rotate(int x,int flag)
{
int y = pre[x];
pushdown(y);
pushdown(x);
ch[y][!flag] = ch[x][flag];
pre[ch[x][flag]] = y;
pre[x] = pre[y];
if(pre[x])
ch[pre[y]][ ch[pre[y]][] == y ] = x;
ch[x][flag] = y;
pre[y] = x;
pushup(y);
}
void splay(int x,int goal)
{
int y,z,flag;
while(pre[x] != goal)
{
if(pre[pre[x]] == goal)
{
pushdown(pre[x]);
pushdown(x);
Rotate(x,ch[pre[x]][] == x);
}
else
{
y = pre[x];
z = pre[y];
pushdown(z);
pushdown(y);
pushdown(x);
flag = (ch[z][] == y);
if(ch[y][flag] == x)
{
Rotate(x,!flag);
Rotate(x,flag);
}
else
{
Rotate(y,flag);
Rotate(x,flag);
}
}
}
pushup(x);
if(goal == ) root = x;
}
void RotateTo(int k,int goal)
{
int x = root;
pushdown(x);
while(sz[ch[x][]] != k)
{
if(k < sz[ch[x][]])
{
x = ch[x][];
}
else
{
k -= (sz[ch[x][]] + );
x = ch[x][];
}
pushdown(x);
}
splay(x,goal);
}
int get_kth(int k)
{
int x = root;
pushdown(x);
while(sz[ch[x][]] != k)
{
if(k < sz[ch[x][]])
{
x = ch[x][];
}
else
{
k -= (sz[ch[x][]] + );
x = ch[x][];
}
pushdown(x);
}
return val[x];
}
void show(int x)
{
if(x == ) return ;
pushdown(x);
show(ch[x][]);
if(val[x] > )
{
printf("%d ",val[x]);
}
show(ch[x][]);
}
int main()
{
int i,k1,k2,n,m,pos,x,y,d,cas = ;
char str[];
while(scanf("%d%d%d%d",&n,&m,&k1,&k2)!=EOF)
{
if(n == &&m == ) break;
root = t = ;
ch[][] = ch[][] = sz[] = pre[] = ;
rev[] = lz[] = ;
NewNode(root,-,);
NewNode(ch[root][],-,root);
for(i = ;i < n;i ++)
scanf("%d",&num[i]);
makeTree(keyTree,,n-,ch[root][]);
pushup(ch[root][]);
pushup(root);
pos = ;
printf("Case #%d:\n",cas++);
for(i = ;i < m;i ++)
{
scanf("%s",str);
if(str[] == 'a')
{
scanf("%d",&d);
x = pos;
y = pos + k2 -;
if(y <= n)
{
RotateTo(x-,);
RotateTo(y+,root);
Update_Add(keyTree,d);
pushup(ch[root][]);
pushup(root);
}
else
{
RotateTo(x-,);
RotateTo(n+,root);
Update_Add(keyTree,d);
pushup(ch[root][]);
pushup(root); RotateTo(,);
RotateTo(y-n+,root);
Update_Add(keyTree,d);
pushup(ch[root][]);
pushup(root);
}
}
else if(str[] == 'r')
{
x = pos;
y = pos + k1 - ;
if(y <= n)
{
RotateTo(x-,);
RotateTo(y+,root);
Update_Rev(keyTree);
}
else
{
int tb = n-x+;
int ta = k1 - tb; RotateTo(x-,);
RotateTo(n+,root);
Update_Rev(keyTree);
pushup(ch[root][]);
pushup(root); RotateTo(,);
RotateTo(ta+,root);
Update_Rev(keyTree);
int temp = keyTree;
keyTree = ;
pushup(ch[root][]);
pushup(root); RotateTo(x--ta,);
RotateTo(x-ta,root);
keyTree = temp;
pre[keyTree] = ch[root][];
pushup(ch[root][]);
pushup(root); RotateTo(n-ta,);
RotateTo(n+,root);
temp = keyTree;
keyTree = ;
pushup(ch[root][]);
pushup(root); RotateTo(,);
RotateTo(,root);
keyTree = temp;
pre[keyTree] = ch[root][];
pushup(ch[root][]);
pushup(root);
}
}
else if(str[] == 'i')
{
n ++;
scanf("%d",&d);
x = pos;
RotateTo(x,);
RotateTo(x+,root);
NewNode(keyTree,d,ch[root][]);
pushup(ch[root][]);
pushup(root);
}
else if(str[] == 'd')
{ x = pos;
RotateTo(x-,);
RotateTo(x+,root);
keyTree = ;
pushup(ch[root][]);
pushup(root);
if(pos == n) pos = ;
n --;
}
else if(str[] == 'm')
{
scanf("%d",&d);
if(d == )
{
pos ++;
if(pos > n) pos = ;
}
else
{
pos --;
if(pos == ) pos = n;
}
}
else
{
printf("%d\n",get_kth(pos));
}
}
}
return ;
}
/*
5 100 3 2
1 2 3 4 5
m 2
m 2
m 2
reverse
*/