【BZOJ 1507】【NOI 2003】&【Tyvj P2388】Editor 块状链表模板题

2016-06-18 当时关于块状链表的想法是错误的，之前维护的是一个动态的$sqrt{n}$，所以常数巨大，今天才知道原因TwT，请不要参照这个程序为模板！！！

模板题水啊水~~~

第一次写块状链表，先写一个模板题(⊙o⊙)

块状链表虽然效率大概在O(n√n)，但它几乎没有常数，相比较理论上复杂度较快的O(nlogn)的Splay还是要快，因为Splay常数太大啦！感觉比较笨重。也许这就是许多OIer热衷分块的原因吧。

BZOJ 1507(因为O2优化，没有内存池)

#include<cmath>
#include<queue>
#include<cstdio>
#include<cstring>
#include<algorithm>
#define for1(i,a,n) for(int i=(a);i<=(n);++i)
#define for2(i,a,n) for(int i=(a);i<(n);++i)
#define for3(i,a,n) for(int i=(a);i>=(n);--i)
#define for4(i,a,n) for(int i=(a);i>(n);--i)
#define CC(i,a) memset(i,a,sizeof(i))
using namespace std;
int now=0,min_tot=0,max_tot=0,tot=0,sq;
struct BLOCK{
    BLOCK();
    BLOCK *next;
    char c[100003];
    int size;
}*head,*null;
BLOCK::BLOCK(){next=null;size=0;}
inline void build(){
    null=new BLOCK;
    *null=BLOCK();
    head=new BLOCK;
}
inline BLOCK *find(int &k){
    BLOCK *r=head;
    while (k-r->size>0&&r->next!=null) k-=r->size,r=r->next;
    return r;
}
inline void cut(BLOCK *r,int pos){
    BLOCK *k=new BLOCK;
    k->size=r->size-pos;
    for1(i,pos+1,r->size) k->c[i-pos]=r->c[i];
    r->size=pos;
    k->next=r->next;
    r->next=k;
}
inline void merge(BLOCK *r){
    if (r->next==null) return;
    BLOCK *k=r->next;
    for1(i,1,k->size) r->c[r->size+i]=k->c[i];
    r->size+=k->size;
    r->next=k->next;
    delete k;
}
inline void balance(){
    BLOCK *r=head;
    sq=floor(sqrt(tot)); min_tot=sq/2; max_tot=sq*2;
    while (r!=null){
        if (r->size<min_tot) if (r->next==null) return; else {merge(r); continue;}
        else if (r->size>max_tot) {cut(r,r->size/2); continue;}
        r=r->next;
    }
}
inline void work1(int x){
    int pnow=now; BLOCK *r=find(pnow),*k=new BLOCK,*sta=k;
    cut(r,pnow);
    for1(i,1,x){
        char cs=getchar();
        while (cs=='
') cs=getchar();
        k->size++; k->c[k->size]=cs;
        if (k->size>=sq){
            k->next=new BLOCK;
            k=k->next;
        }
    }k->next=r->next;r->next=sta;
}
inline void work2(int x){
    int pnow=now; BLOCK *r=find(pnow);
    if (x<=r->size-pnow){
        cut(r,pnow); cut(r->next,x);
        BLOCK *xx=r->next;
        r->next=r->next->next;
        delete xx;
        return;
    }
    x-=r->size-pnow;
    cut(r,pnow);
    BLOCK *xy=r->next;
    r->next=r->next->next;
    delete xy;
    while (x-r->next->size>0&&r->next!=null){
        x-=r->next->size;
        BLOCK *xx=r->next;
        r->next=r->next->next;
        delete xx;
    }cut(r->next,x);
    BLOCK *xx=r->next;
    r->next=r->next->next;
    delete xx;
}
inline void work3(int x){
    int pnow=now; BLOCK *r=find(pnow);
    if (x<=r->size-pnow){for1(i,pnow+1,pnow+x) putchar(r->c[i]); return;}
    for1(i,pnow+1,r->size) putchar(r->c[i]);
    x-=r->size-pnow; r=r->next;
    while (x-r->size>0&&r!=null){
        for1(i,1,r->size) putchar(r->c[i]);
        x-=r->size; r=r->next;
    }for1(i,1,x)putchar(r->c[i]);
}
int main(){
    build();
    int n;scanf("%d
",&n);
    while (n--){
        char str=getchar(),st=getchar();
        int x;
        switch(str){
            case 'I':
                while (st!=' ') st=getchar();
                scanf("%d",&x); tot+=x; sq=floor(sqrt(tot)); min_tot=sq/2; max_tot=sq*2;
                work1(x);
                balance();
                scanf("
");
            break;
            case 'M':
                while (st!=' ') st=getchar();
                scanf("%d
",&now);
            break;
            case 'D':
                while (st!=' ') st=getchar();
                scanf("%d
",&x); work2(x);
                tot-=x; balance();
            break;
            case 'G':
                while (st!=' ') st=getchar();
                scanf("%d
",&x); work3(x); printf("
");
            break;
            case 'P':
                now--;st=getchar();st=getchar();st=getchar();
            break;
            case 'N':
                now++;st=getchar();st=getchar();st=getchar();
            break;
        }
    }
    return 0;
}

Tyvj P2388(Windows下评测的new和delete慢得飞起，所以写了个内存池)

#include<cmath>
#include<queue>
#include<cstdio>
#include<cstring>
#include<algorithm>
#define for1(i,a,n) for(int i=(a);i<=(n);++i)
#define for2(i,a,n) for(int i=(a);i<(n);++i)
#define for3(i,a,n) for(int i=(a);i>=(n);--i)
#define for4(i,a,n) for(int i=(a);i>(n);--i)
#define CC(i,a) memset(i,a,sizeof(i))
using namespace std;
int now=0,min_tot=0,max_tot=0,tot=0,sq;
struct BLOCK{
	BLOCK();
	BLOCK *next;
	char c[10003];
	int size;
}*head,*null,pool[10003];
int top=0;
BLOCK::BLOCK(){next=null;size=0;}
inline BLOCK *newBLOCK(){
	BLOCK *t=&pool[top++];
	t->next=null; t->size=0;
	return t;
}
inline void build(){
	null=newBLOCK();
	null->next=null; null->size=0;
	head=newBLOCK();
}
inline BLOCK *find(int &k){
	BLOCK *r=head;
	while (k-r->size>0&&r->next!=null) k-=r->size,r=r->next;
	return r;
}
inline void cut(BLOCK *r,int pos){
	BLOCK *k=newBLOCK();
	k->size=r->size-pos;
	for1(i,pos+1,r->size) k->c[i-pos]=r->c[i];
	r->size=pos;
	k->next=r->next;
	r->next=k;
}
inline void merge(BLOCK *r){
	if (r->next==null) return;
	BLOCK *k=r->next;
	for1(i,1,k->size) r->c[r->size+i]=k->c[i];
	r->size+=k->size;
	r->next=k->next;
	//delete k;
}
inline void balance(){
	BLOCK *r=head;
	sq=floor(sqrt(tot)); min_tot=sq/2; max_tot=sq*2;
	while (r!=null){
		if (r->size<min_tot) if (r->next==null) return; else {merge(r); continue;}
		else if (r->size>max_tot) {cut(r,r->size/2); continue;}
		r=r->next;
	}
}
inline void work1(int x){
	int pnow=now; BLOCK *r=find(pnow),*k=newBLOCK(),*sta=k;
	cut(r,pnow);
	for1(i,1,x){
		char cs=getchar();
		while (cs=='
') cs=getchar();
		k->size++; k->c[k->size]=cs;
		if (k->size>=sq){
			k->next=newBLOCK();
			k=k->next;
		}
	}k->next=r->next;r->next=sta;
}
inline void work2(int x){
	int pnow=now; BLOCK *r=find(pnow);
	if (x<=r->size-pnow){
		cut(r,pnow); cut(r->next,x);
		BLOCK *xx=r->next;
		r->next=r->next->next;
		//delete xx;
		return;
	}
	x-=r->size-pnow;
	cut(r,pnow);
	BLOCK *xy=r->next;
	r->next=r->next->next;
	//delete xy;
	while (x-r->next->size>0&&r->next!=null){
		x-=r->next->size;
		BLOCK *xx=r->next;
		r->next=r->next->next;
		//delete xx;
	}cut(r->next,x);
	BLOCK *xx=r->next;
	r->next=r->next->next;
	//delete xx;
}
inline void work3(int x){
	int pnow=now; BLOCK *r=find(pnow);
	if (x<=r->size-pnow){for1(i,pnow+1,pnow+x) putchar(r->c[i]); return;}
	for1(i,pnow+1,r->size) putchar(r->c[i]);
	x-=r->size-pnow; r=r->next;
	while (x-r->size>0&&r!=null){
		for1(i,1,r->size) putchar(r->c[i]);
		x-=r->size; r=r->next;
	}for1(i,1,x)putchar(r->c[i]);
}
int main(){
	build();
	int n;scanf("%d
",&n);
	while (n--){
		char str=getchar(),st=getchar();
		int x;
		switch(str){
			case 'I':
				while (st!=' ') st=getchar();
				scanf("%d",&x); tot+=x; sq=floor(sqrt(tot)); min_tot=sq/2; max_tot=sq*2;
				work1(x);
				balance();
				scanf("
");
			break;
			case 'M':
				while (st!=' ') st=getchar();
				scanf("%d
",&now);
			break;
			case 'D':
				while (st!=' ') st=getchar();
				scanf("%d
",&x); work2(x);
				tot-=x;	balance();
			break;
			case 'G':
				while (st!=' ') st=getchar();
				scanf("%d
",&x); work3(x); printf("
");
			break;
			case 'P':
				now--;st=getchar();st=getchar();st=getchar();
			break;
			case 'N':
				now++;st=getchar();st=getchar();st=getchar();
			break;
		}
	}
	return 0;
}

分块真心强大，，，