제출 #911637

#제출 시각아이디문제언어결과실행 시간메모리
911637Faisal_Saqib크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++17
34 / 100
221 ms262144 KiB
#include <iostream> using namespace std; struct StringTree { char c='1'; int s,e; int len=0; StringTree* next[2]; StringTree(int l,int r,bool p=0) { s=l; e=r; if(s!=e and !p) { int mid=(s+e)/2; next[0]=new StringTree(s,mid); next[1]=new StringTree(mid+1,e); } } char get(int&x) { if(s==e) return c; int mid=(s+e)/2; return next[(x>mid)]->get(x); } }; const int MAXT=2e6+1; StringTree* st[MAXT]; int tm=1; StringTree* Update(StringTree* prev,char&c,int&ind) { StringTree* tp=new StringTree(prev->s,prev->e,1); tp->len=prev->len+1; tp->c=c; if(prev->s==prev->e) return tp; int mid=(prev->s+prev->e)/2; if(ind<=mid) { tp->next[1]=prev->next[1]; tp->next[0]=Update(prev->next[0],c,ind); } else { tp->next[0]=prev->next[0]; tp->next[1]=Update(prev->next[1],c,ind); } return tp; } void Init() { st[0]=new StringTree(0,MAXT); } void TypeLetter(char L) { st[tm]=Update(st[tm-1],L,st[tm-1]->len); tm++; } void UndoCommands(int U) { st[tm]=st[tm-U-1]; tm++; } char GetLetter(int P) { return st[tm-1]->get(P); }
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