제출 #857882

#제출 시각아이디문제언어결과실행 시간메모리
857882sleepntsheep크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++17
0 / 100
446 ms97068 KiB
#include <cstdio> #include <cstring> #include <cassert> #include <string> #include <deque> #include <vector> #include <map> #include <queue> #include <algorithm> #include <iostream> #include <utility> using namespace std; using ll=long long; #define ALL(x) x.begin(), x.end() int p[20][1<<20], a[1<<20], ptr, dep[1<<20]; vector<int> chain; void Init() { } void TypeLetter(char l) { a[1+ptr] = l; p[0][1+ptr] = ptr; dep[1+ptr] = dep[ptr]+1; for (int j = 1; j < 20; ++j) p[j][1+ptr] = p[j-1][p[j-1][1+ptr]]; chain.push_back(++ptr); a[ptr] = l; } void UndoCommands(int u) { ptr=chain[max((int)chain.size()-u-1, 0)]; chain.push_back(ptr); } char GetLetter(int k) { int c = ptr; k = dep[c] - k; for (int j = 20; j--;) if (k & (1 << j)) c = p[j][c]; return a[c]; }
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