제출 #469836

#제출 시각아이디문제언어결과실행 시간메모리
469836wind_reaper크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++17
34 / 100
60 ms19200 KiB
const int MXN = 100001; char s[MXN]; int up[20][MXN], D[MXN], p[MXN]; int idx = 0, c = 0; void Init(){} void TypeLetter(char L){ s[++idx] = L; up[0][idx] = p[c]; D[idx] = D[p[c]] + 1; p[++c] = idx; for(int i = 1; i < 20; i++) up[i][idx] = up[i-1][up[i-1][idx]]; } void UndoCommands(int U){ ++c; p[c] = p[c-U-1]; } char GetLetter(int P){ int v = p[c]; ++P; for(int i = 19; i >= 0; --i) if((D[v] - P) & (1 << i)) v = up[i][v]; return s[v]; }
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