제출 #576060

#제출 시각아이디문제언어결과실행 시간메모리
576060benson1029크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++14
100 / 100
458 ms90572 KiB
#include<bits/stdc++.h> using namespace std; char curr[1000005]; int sparse[1000005][21]; int cntop; int len[1000005]; void Init() { cntop = 0; } void TypeLetter(char L) { cntop++; len[cntop] = len[cntop-1] + 1; curr[cntop] = L; sparse[cntop][0] = cntop-1; for(int i=1; i<=20; i++) { if(sparse[cntop][i-1] == 0) sparse[cntop][i-1] = 0; else sparse[cntop][i] = sparse[sparse[cntop][i-1]][i-1]; } } void UndoCommands(int U) { cntop++; len[cntop] = len[cntop-U-1]; curr[cntop] = curr[cntop-U-1]; for(int i=0; i<=20; i++) sparse[cntop][i] = sparse[cntop-U-1][i]; } char GetLetter(int P) { P++; int ptr = len[cntop], tmp = cntop; for(int i=20; i>=0; i--) { if(ptr - (1<<i) >= P) { ptr -= (1<<i); tmp = sparse[tmp][i]; } } return curr[tmp]; }
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