[NOI2003][bzoj1507] 文本编辑器 editor [splay]

其实看明白了就是一道水题

毕竟模板

splay敲一发，插入一个串的时候先把它构建成一棵平衡树，再挂到原来的splay上面去即可

没别的了，上代码

#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
using namespace std;
inline int read(){
    int re=,flag=;char ch=getchar();
    while(ch>''||ch<''){
        if(ch=='-') flag=-;
        ch=getchar();
    }
    while(ch>=''&&ch<='') re=(re<<)+(re<<)+ch-'',ch=getchar();
    return re*flag;
}
int n,cnt=,root=,mouse=;
int fa[]={},ch[][]={},siz[]={};
char w[]={};
void update(int x){siz[x]=siz[ch[x][]]+siz[ch[x][]]+;}
int get(int x){return ch[fa[x]][]==x;}
void rotate(int x){
    int f=fa[x],ff=fa[f],son=get(x);
    ch[f][son]=ch[x][son^];
    if(ch[f][son]) fa[ch[f][son]]=f;
    fa[f]=x;ch[x][son^]=f;
    fa[x]=ff;
    if(ff) ch[ff][ch[ff][]==f]=x;
    update(f);update(x);
}
void splay(int x,int to){
//    cout<<"splay "<<x<<ends<<" "<<endl;
    if(x==to||fa[x]==to) return;
    if(to==) root=x;
    for(int f;(f=fa[x])&&(f!=to);rotate(x)){
        if(fa[f]!=to)
            rotate(get(x)==get(f)?f:x);
    }
    update(x);
}
int rank(int x,int pos){
//    cout<<"rank "<<x<<ends<<siz[pos]<<ends<<siz[ch[pos][0]]<<ends<<pos<<endl;
//    if(pos==0) system("pause");
    if(siz[ch[pos][]]+==x){
        splay(pos,);return pos;
    }
    if(siz[ch[pos][]]>=x) return rank(x,ch[pos][]);
    else return rank(x-siz[ch[pos][]]-,ch[pos][]);
}
char s[]={};
int build(int l,int r,int f){
    if(l>r) return ;
//    cout<<"build "<<l<<ends<<r<<ends<<f<<endl;
    int mid=(l+r)>>,cur=++cnt;
    fa[cur]=f;w[cur]=s[mid];
    ch[cur][]=build(l,mid-,cur);
    ch[cur][]=build(mid+,r,cur);
    update(cur);return cur;
}
void insert(int l,int len){
    int x=rank(l,root),y=rank(l+,root);
    splay(x,);splay(y,root);
    ch[y][]=build(,len,y);
    update(y);update(x);
}
void del(int l,int r){
    int x=rank(l,root),y=rank(r+,root);
    splay(x,);splay(y,root);
    ch[y][]=;update(y);update(x);
}
void dfs(int x){
    if(!x) return;
    dfs(ch[x][]);
    printf("%c",w[x]);
    dfs(ch[x][]);
}
void print(int l,int len){
    int x=rank(l,root),y=rank(l+len+,root);
    splay(x,);splay(y,root);
    dfs(ch[y][]);puts("");
}
int main(){
//    freopen("editor2003.in","r",stdin);
//    freopen("editor2003.out","w",stdout);
    int i,j,t1;char op[];char c;
    n=read();
    root=++cnt;w[cnt]=;siz[cnt]=;
    ch[cnt][]=cnt+;cnt++;fa[cnt]=cnt-;w[cnt]=;siz[cnt]=;
    mouse=;
    for(i=;i<=n;i++){
        scanf("%s",op);
        if(op[]=='I'){
            t1=read();
            for(j=;j<=t1;j++){
                c=getchar();
                while(c=='\n') c=getchar();
                s[j]=c;
//                cout<<"inserted "<<s[j]<<endl;
            }
            insert(mouse,t1);
        }
        if(op[]=='D'){
            t1=read();
            del(mouse,mouse+t1-);
        }
        if(op[]=='G'){
            t1=read();
            print(mouse,t1);
        }
        if(op[]=='M'){
            t1=read();
            mouse=t1+;
        }
        if(op[]=='N') mouse++;
        if(op[]=='P') mouse--;
    }
} 

奇怪的是，COGS和luogu上都说我没有输出

可是我Windows下都过了啊......

大概是时候装Linux了

UPDATE 18/1/30

装了一个Ubuntu 16.04，发现是换行符的问题

Linux评测机下是\n，但是因为数据是在Windows下生成的，所以实际上读入的文件里是\r\n，所以没有读出来

New Code：

#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
using namespace std;
inline int read(){
    int re=,flag=;char ch=getchar();
    while(ch>''||ch<''){
        if(ch=='-') flag=-;
        ch=getchar();
    }
    while(ch>=''&&ch<='') re=(re<<)+(re<<)+ch-'',ch=getchar();
    return re*flag;
}
int n,cnt=,root=,mouse=;
int fa[]={},ch[][]={},siz[]={};
char w[]={};
void update(int x){siz[x]=siz[ch[x][]]+siz[ch[x][]]+;}
int get(int x){return ch[fa[x]][]==x;}
void rotate(int x){
    int f=fa[x],ff=fa[f],son=get(x);
    ch[f][son]=ch[x][son^];
    if(ch[f][son]) fa[ch[f][son]]=f;
    fa[f]=x;ch[x][son^]=f;
    fa[x]=ff;
    if(ff) ch[ff][ch[ff][]==f]=x;
    update(f);update(x);
}
void splay(int x,int to){
//    cout<<"splay "<<x<<ends<<" "<<endl;
    if(x==to||fa[x]==to) return;
    if(to==) root=x;
    for(int f;(f=fa[x])&&(f!=to);rotate(x)){
        if(fa[f]!=to)
            rotate(get(x)==get(f)?f:x);
    }
    update(x);
}
int rank(int x,int pos){
//    cout<<"rank "<<x<<ends<<siz[pos]<<ends<<siz[ch[pos][0]]<<ends<<pos<<endl;
//    if(pos==0) system("pause");
    if(siz[ch[pos][]]+==x){
        splay(pos,);return pos;
    }
    if(siz[ch[pos][]]>=x) return rank(x,ch[pos][]);
    else return rank(x-siz[ch[pos][]]-,ch[pos][]);
}
char s[]={};
int build(int l,int r,int f){
    if(l>r) return ;
//    cout<<"build "<<l<<ends<<r<<ends<<f<<endl;
    int mid=(l+r)>>,cur=++cnt;
    fa[cur]=f;w[cur]=s[mid];
    ch[cur][]=build(l,mid-,cur);
    ch[cur][]=build(mid+,r,cur);
    update(cur);return cur;
}
void insert(int l,int len){
    int x=rank(l,root),y=rank(l+,root);
    splay(x,);splay(y,root);
    ch[y][]=build(,len,y);
    update(y);update(x);
}
void del(int l,int r){
    int x=rank(l,root),y=rank(r+,root);
    splay(x,);splay(y,root);
    ch[y][]=;update(y);update(x);
}
void dfs(int x){
    if(!x) return;
    dfs(ch[x][]);
    printf("%c",w[x]);
    dfs(ch[x][]);
}
void print(int l,int len){
    int x=rank(l,root),y=rank(l+len+,root);
    splay(x,);splay(y,root);
    dfs(ch[y][]);puts("");
}
int main(){
//    freopen("editor20031.in","r",stdin);
//    freopen("editor2003.out","w",stdout);
    int i,j,t1;char op[];char c;
    n=read();
    root=++cnt;w[cnt]=;siz[cnt]=;
    ch[cnt][]=cnt+;cnt++;fa[cnt]=cnt-;w[cnt]=;siz[cnt]=;
    mouse=;
    for(i=;i<=n;i++){
        scanf("%s",op);
        if(op[]=='I'){
            t1=read();
            for(j=;j<=t1;j++){
                c=getchar();
                while(c=='\n'||c=='\r') c=getchar();
                s[j]=c;
            }
            insert(mouse,t1);
        }
        if(op[]=='D'){
            t1=read();
            del(mouse,mouse+t1-);
        }
        if(op[]=='G'){
            t1=read();
            print(mouse,t1);
        }
        if(op[]=='M'){
            t1=read();
            mouse=t1+;
        }
        if(op[]=='N') mouse++;
        if(op[]=='P') mouse--;
    }
}