제출 #761142

#제출 시각아이디문제언어결과실행 시간메모리
761142SanguineChameleon크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++17
100 / 100
339 ms67108 KiB
#include <bits/stdc++.h> using namespace std; const int maxN = 1e6 + 20; const int maxK = 20; int par[maxN][maxK]; char a[maxN]; int id[maxN]; int depth[maxN]; int op; int node; void Init() { op = 1; node = 1; id[op] = 1; depth[node] = 0; for (int k = 0; k < maxK; k++) { par[1][k] = 1; } } void TypeLetter(char L) { op++; node++; par[node][0] = id[op - 1]; depth[node] = depth[id[op - 1]] + 1; a[node] = L; for (int k = 1; k < maxK; k++) { par[node][k] = par[par[node][k - 1]][k - 1]; } id[op] = node; } void UndoCommands(int U) { op++; id[op] = id[op - 1 - U]; } char GetLetter(int P) { P++; int u = id[op]; int h = depth[u] - P; for (int k = 0; k < maxK; k++) { if ((h >> k) & 1) { u = par[u][k]; } } return a[u]; }
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