제출 #767962

#제출 시각아이디문제언어결과실행 시간메모리
767962raysh07크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++17
100 / 100
553 ms86712 KiB
#include <bits/stdc++.h> using namespace std; int timer; const int N = 1e6 + 2; int lift[20][N], len[N]; char last[N]; void Init() { timer = 0; } void TypeLetter(char l) { timer++; lift[0][timer] = timer - 1; for (int i = 1; i < 20; i++){ lift[i][timer] = lift[i - 1][lift[i - 1][timer]]; } last[timer] = l; len[timer] = len[timer - 1] + 1; } void UndoCommands(int u) { int ok = timer - u; timer++; len[timer] = len[ok]; last[timer] = last[ok]; for (int i = 0; i < 20; i++) lift[i][timer] = lift[i][ok]; } char GetLetter(int p) { p++; int ok = timer; for (int i = 19; i >= 0; i--){ int x = lift[i][ok]; if (len[x] < p) continue; ok = x; } return last[ok]; }
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