标签:io os ar for sp div art on amp
题目大意:维护一个文本编辑器,支持下列操作:
1.将光标移动到某一位置
2.在光标后插入一段字符串
3.删除光标后的一段字符
4.翻转光标后的一段字符
5.输出光标后的一个字符
6.光标--
7.光标++
Splay中比較水的一道题,标记仅仅有区间翻转,也不用维护区间总值,只有须要注意的就是插入的时候fa要记得赋值,不然就会像本蒟蒻一样调半天,,,
这题要注意的是Insert操作的读入 首先读入第一个不是‘\n‘或者‘\r‘的字符,然后假设长度不为1就继续gets() 记住是get()不是scanf
然后就没啥了。。。 20%达成 啊啊爽翻天
#include<cstdio> #include<cstring> #include<iostream> #include<algorithm> using namespace std; struct abcd{ abcd *fa,*ls,*rs; char c; int siz; bool rev_mark; abcd (char C); void Reverse(); void Push_Up(); void Push_Down(); }*null=new abcd(0),*root=null; abcd :: abcd(char C) { fa=ls=rs=null; c=C; siz=C?1:0; rev_mark=0; } void abcd :: Reverse() { rev_mark^=1; swap(ls,rs); } void abcd :: Push_Up() { siz=ls->siz+rs->siz+1; } void abcd :: Push_Down() { if(rev_mark) { ls->Reverse(); rs->Reverse(); rev_mark=0; } } void Zig(abcd *x) { abcd *y=x->fa; y->ls=x->rs; x->rs->fa=y; x->rs=y; x->fa=y->fa; if(y==y->fa->ls) y->fa->ls=x; else if(y==y->fa->rs) y->fa->rs=x; y->fa=x; y->Push_Up(); if(y==root) root=x; } void Zag(abcd *x) { abcd *y=x->fa; y->rs=x->ls; x->ls->fa=y; x->ls=y; x->fa=y->fa; if(y==y->fa->ls) y->fa->ls=x; else if(y==y->fa->rs) y->fa->rs=x; y->fa=x; y->Push_Up(); if(y==root) root=x; } void Splay(abcd *x,abcd *Tar) { while(1) { abcd *y=x->fa,*z=y->fa; if(y==Tar) break ; if(z==Tar) { if(x==y->ls) Zig(x); else Zag(x); break; } if(x==y->ls) { if(y==z->ls) Zig(y); Zig(x); } else { if(y==z->rs) Zag(y); Zag(x); } } x->Push_Up(); } void Find(abcd *x,int y,abcd *z) { while(1) { x->Push_Down(); if(y<=x->ls->siz) x=x->ls; else { y-=x->ls->siz; if(y==1) break; y--; x=x->rs; } } Splay(x,z); } char s[1<<21]; void Build_Tree(abcd *&x,int l,int r) { if(l>r) return ; int mid=l+r>>1; x=new abcd(s[mid]); Build_Tree(x->ls,l,mid-1); Build_Tree(x->rs,mid+1,r); if(x->ls!=null) x->ls->fa=x; if(x->rs!=null) x->rs->fa=x; x->Push_Up(); } int cursor,m; int main() { int i,x; char p[100]; cin>>m; { root=new abcd('\n'); root->rs=new abcd('\n'); root->rs->fa=root; root->Push_Up(); } for(i=1;i<=m;i++) { scanf("%s",p); if(p[0]=='M') scanf("%d",&cursor); else if(p[0]=='I') { scanf("%d",&x); do s[0]=getchar(); while(s[0]=='\n'||s[0]=='\r'); if(x^1) gets(s+1); Find(root,cursor+1,null); Find(root,cursor+2,root); Build_Tree(root->rs->ls,0,x-1); root->rs->ls->fa=root->rs; root->rs->Push_Up(); root->Push_Up(); } else if(p[0]=='D') { scanf("%d",&x); Find(root,cursor+1,null); Find(root,cursor+x+2,root); root->rs->ls=null; root->rs->Push_Up(); root->Push_Up(); } else if(p[0]=='R') { scanf("%d",&x); Find(root,cursor+1,null); Find(root,cursor+x+2,root); root->rs->ls->Reverse(); } else if(p[0]=='G') { Find(root,cursor+2,null); printf("%c\n",root->c); } else if(p[0]=='P') cursor--; else cursor++; } }
标签:io os ar for sp div art on amp
原文地址:http://www.cnblogs.com/hrhguanli/p/4028564.html