参考论文《运用伸展树解决数列维护问题》
/**/ /*
    题意：实现插入、删除、查询最大子段和、求和
           翻转，置为一样

   每次修改后splay到根（这样来更新）
   update操作里面需要有push_down先
   每次访问节点时都需要push_down
*/
#include < cstdio >
#include < cstring >
#include < algorithm >
using   namespace  std;

 const   int  MAXN  =   500000 * 2 ;
 const   int  INF  =   1000000000 ;

inline  int  max( int  a, int  b) {return a>b?a:b;}
inline  int  min( int  a, int  b) {return a<b?a:b;}

struct  Node
 {
    int ml,mc,mr;
    int size,sum,val;
    bool rev,same;
    Node *ch[2],*pre;
} ;

 struct  Splay
 {
    Node *root,*null;
    Node data[MAXN],*Store[MAXN];
    int top,cnt;

    Node *newNode(int val)
    {
        Node *p;
        if(top)p=Store[top--];
        else p=&data[cnt++];
        p->sum=p->val=val;
        p->ml=p->mc=p->mr=val;
        p->size=1;
        p->ch[0]=p->ch[1]=p->pre=null;
        p->rev=p->same=false;
        return p;
    }
    void init()
    {
        top=cnt=0;
        null = newNode(-INF);
        null->size=null->sum=0;
        root=newNode(-INF);
        root->ch[1]=newNode(-INF);
        root->ch[1]->pre=root;
        update(root);
    }
    void update(Node *p)
    {
        if(p==null)return;
        //需要先push_down
        push_down(p);
        push_down(p->ch[0]);
        push_down(p->ch[1]);

        p->size=p->ch[0]->size+p->ch[1]->size+1;
        p->sum=p->ch[0]->sum+p->ch[1]->sum+p->val;

        p->ml=max(p->ch[0]->ml,p->ch[0]->sum+p->val+max(0,p->ch[1]->ml));
        p->mr=max(p->ch[1]->mr,p->ch[1]->sum+p->val+max(0,p->ch[0]->mr));

        p->mc=max(p->ch[0]->mc,p->ch[1]->mc);
        p->mc=max(p->mc,max(p->ch[0]->mr+p->ch[1]->ml,0)+p->val);
        p->mc=max(p->mc,max(p->ch[0]->mr,p->ch[1]->ml)+p->val);
    }
    void push_down(Node *p)
    {
        if(p==null)return;
        if(p->rev)
        {
            p->rev=false;
            p->ch[0]->rev^=1;
            p->ch[1]->rev^=1;
            swap(p->ch[0],p->ch[1]);
            swap(p->ml,p->mr);
        }
        if(p->same)
        {
            p->same=false;
            p->ch[0]->same=p->ch[1]->same=true;
            p->ch[0]->val=p->ch[1]->val=p->val;
            p->sum=p->val*p->size;
            p->ml=p->mc=p->mr=p->val*p->size;
            if(p->val<0)
                p->ml=p->mc=p->mr=p->val;
        }
    }
    void rotate(Node *x,int c)
    {
        Node *y=x->pre;
        push_down(y);
        push_down(x);
        y->ch[!c]=x->ch[c];
        if(x->ch[c]!=null)x->ch[c]->pre=y;
        x->pre=y->pre;
        if(y->pre!=null)
        {
            if(y->pre->ch[0]==y)y->pre->ch[0]=x;
            else y->pre->ch[1]=x;
        }
        x->ch[c]=y;
        y->pre=x;
        update(y);
        if(y==root)root=x;
    }
    void splay(Node *x,Node *f)
    {
        if(x==null)return;
        for(push_down(x);x->pre!=f;)
        {
            if(x->pre->pre==f)
            {
                if(x->pre->ch[0]==x)rotate(x,1);
                else rotate(x,0);
            }
            else
            {
                Node *y=x->pre,*z=y->pre;
                if(z->ch[0]==y)
                {
                    if(y->ch[0]==x)rotate(y,1),rotate(x,1);
                    else rotate(x,0),rotate(x,1);
                }
                else 
                {    
                    if(y->ch[1]==x)rotate(y,0),rotate(x,0);
                    else rotate(x,1),rotate(x,0);
                }    
            }
        }
        update(x);
    }
    void select(int k,Node *f)
    {
        Node *t;
        for(t=root;;)
        {
            push_down(t);
            int size=t->ch[0]->size;
            if(k==size)break;
            if(k<size)t=t->ch[0];
            else k-=size+1,t=t->ch[1];
        }
        splay(t,f);
    }
    Node *build(int left,int right,int *ary)        
    {
        if(left>right)return null;
        int mid=(left+right)>>1;
        Node *p=newNode(ary[mid]);
        p->ch[0]=build(left,mid-1,ary);
        if(p->ch[0]!=null)p->ch[0]->pre=p;
        p->ch[1]=build(mid+1,right,ary);
        if(p->ch[1]!=null)p->ch[1]->pre=p;
        update(p);
        return p;
    }
    void insert(int pos,int *ary,int n)
    {
        select(pos-1,null);
        select(pos,root);
        Node *p=build(0,n-1,ary);
        root->ch[1]->ch[0]=p;
        p->pre=root->ch[1];
        splay(p,null);
    }
    void del(int start,int end)//[start,end)
    {
        select(start-1,null);
        select(end,root);
        Node *p=root->ch[1]->ch[0];
        root->ch[1]->ch[0]=null;
        splay(root->ch[1],null);
        recyle(p);//
    }
    void recyle(Node *p)
    {
        if(p==null)return;
        recyle(p->ch[0]);
        recyle(p->ch[1]);
        Store[++top]=p;
    }
    int getSum(int start,int end)//[start,end)
    {
        select(start-1,null);
        select(end,root);
        return root->ch[1]->ch[0]->sum;
    }
    int maxSum(int start,int end)
    {
        select(start-1,null);
        select(end,root);
        return root->ch[1]->ch[0]->mc;
    }
    void makeSame(int start,int end,int c)
    {
        select(start-1,null);
        select(end,root);
        Node *p=root->ch[1]->ch[0];
        p->same=true;
        p->val=c;
        splay(p,null);
    }
    void reverse(int start,int end)
    {
        select(start-1,null);
        select(end,root);
        Node *p=root->ch[1]->ch[0];
        p->rev^=1;
        splay(p,null);
    }
    void print(Node *p)
    {
        if(p==null)return;
        push_down(p);
        print(p->ch[0]);
        printf("%d %d %d %d %d\n",p->val,p->ml,p->mc,p->mr,p->mc);
        print(p->ch[1]);        
    }
} splay;

 int  ary[MAXN];

 int  main()
 {
    //freopen("in","r",stdin);
    int T;
    for(scanf("%d",&T);T--;)
    {
        int N,Q,n,x,y;
        char cmd[20];
        scanf("%d%d",&N,&Q);
        for(int i=0;i<N;i++)
            scanf("%d",&ary[i]);
        splay.init();
        splay.insert(1,ary,N);
        for(;Q--;)
        {
            scanf("%s",cmd);
            if(strcmp(cmd,"GET-SUM")==0)
            {
                scanf("%d%d",&x,&n);
                printf("%d\n",splay.getSum(x,x+n));
            }
            if(strcmp(cmd,"MAX-SUM")==0)
            {
                printf("%d\n",splay.maxSum(1,splay.root->size-1));
            }
            if(strcmp(cmd,"INSERT")==0)
            {
                scanf("%d%d",&x,&n);
                x++;
                for(int i=0;i<n;i++)
                    scanf("%d",&ary[i]);
                splay.insert(x,ary,n);
            }
            if(strcmp(cmd,"DELETE")==0)
            {
                scanf("%d%d",&x,&n);
                splay.del(x,x+n);
            }
            if(strcmp(cmd,"REVERSE")==0)
            {
                scanf("%d%d",&x,&n);
                splay.reverse(x,x+n);
            }
            if(strcmp(cmd,"MAKE-SAME")==0)
            {
                scanf("%d%d%d",&x,&n,&y);
                splay.makeSame(x,x+n,y);
            }
        }
    }
    return 0;
}