제출 #550650

#제출 시각아이디문제언어결과실행 시간메모리
550650David_M크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++14
100 / 100
436 ms86724 KiB
#include<bits/stdc++.h> using namespace std; #define ll long long #define pb push_back int curr, last=-1, h[1000006], pa[20][1000006]; char C[1000006]; void add(int x, char c){ last++; pa[0][last]=curr; h[last]=h[curr]+1; curr=last; C[curr]=c; for (int i=1; i<20; i++){ pa[i][curr]=pa[i-1][pa[i-1][curr]]; } } void roll_back(int t){ curr=++last; h[curr]=h[t]; C[curr]=C[t]; for (int i=0; i<20; i++){ pa[i][curr]=pa[i][t]; } } int Kth_parent(int k){ int Pa=curr; for (int i=19; i>=0; i--){ if(k&(1<<i))Pa=pa[i][Pa]; } return C[Pa]; } void Init() { h[0]=-1; } string s; void TypeLetter(char L) { add(curr, L); } void UndoCommands(int U) { roll_back(last-U); } char GetLetter(int P) { return Kth_parent(h[curr]-P); }
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