제출 #988500

#제출 시각아이디문제언어결과실행 시간메모리
988500huutuan크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++14
100 / 100
358 ms129184 KiB
#include <bits/stdc++.h> using namespace std; const int N=1e6+10, LG=20; int dep[N], up[LG][N], node[N]; char a[N]; vector<int> g[N]; int cur, cnt; void Init() { cur=0, cnt=0; } void TypeLetter(char L) { a[++cnt]=L; g[cur].push_back(cnt); dep[cnt]=dep[cur]+1; up[0][cnt]=cur; for (int k=1; k<LG; ++k) up[k][cnt]=up[k-1][up[k-1][cnt]]; cur=cnt; node[cnt]=cur; } void UndoCommands(int U) { ++cnt; cur=node[cnt-U-1]; node[cnt]=cur; } char GetLetter(int P) { int d=dep[cur]-P-1; int u=cur; for (int k=0; k<LG; ++k) if (d>>k&1) u=up[k][u]; return a[u]; }
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