제출 #851991

#제출 시각아이디문제언어결과실행 시간메모리
85199112345678크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++17
100 / 100
286 ms70272 KiB
#include <bits/stdc++.h> using namespace std; const int nx=1e6+5, mx=20; int p[nx][mx], t, c[nx], cur, sz[nx]; vector<int> v; void Init() { } void TypeLetter(char L) { t++; p[t][0]=cur; sz[t]=sz[cur]+1; for (int i=1; i<mx; i++) p[t][i]=p[p[t][i-1]][i-1]; cur=t; c[cur]=L; v.push_back(cur); } void UndoCommands(int U) { cur=v[max((int) v.size()-U-1, 0)]; v.push_back(cur); } char GetLetter(int P) { int k=sz[cur]-P-1, tmp=cur; for (int i=0; i<mx; i++) if (k&(1<<i)) tmp=p[tmp][i]; return c[tmp]; }
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