제출 #548721

#제출 시각아이디문제언어결과실행 시간메모리
548721ikaurov크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++17
60 / 100
1004 ms87032 KiB
#pragma GCC optimize("O3") #include <bits/stdc++.h> using namespace std; #define all(arr) (arr).begin(), (arr).end() #define ll long long #define ld long double #define pb push_back #define sz(x) int((x).size()) #define fi first #define se second #define endl '\n' const int N = 1e6 + 20, LOG = 20; int par[N][LOG], lg[N]; int dp[N]; string s = "."; void Init(){ lg[1] = 0; for (int i = 2; i < N; i++) lg[i] = lg[i >> 1] + 1; } void TypeLetter(char c){ int idx = sz(s); dp[idx] = dp[idx - 1] + 1; s.pb(c); par[idx][0] = idx - 1; for (int i = 1; i < LOG; i++){ par[idx][i] = par[par[idx][i - 1]][i - 1]; if (!par[idx][i]) break; } } void UndoCommands(int x){ int idx = sz(s); dp[idx] = dp[max(idx - 1 - x, 0)]; s.pb('#'); par[idx][0] = max(idx - 1 - x, 0); for (int i = 1; i < LOG; i++){ par[idx][i] = par[par[idx][i - 1]][i - 1]; if (!par[idx][i]) break; } } char GetLetter(int pos){ int idx = sz(s) - 1; for (int i = lg[sz(s)]; i >= 0; i--){ if (dp[par[idx][i]] > pos) idx = par[idx][i]; } return s[idx]; } // signed main(){ // ios_base::sync_with_stdio(0); // cin.tie(0); // // cout.precision(20); // Init(); // TypeLetter('a'); // TypeLetter('b'); // GetLetter(1); // TypeLetter('d'); // UndoCommands(2); // UndoCommands(1); // GetLetter(2); // TypeLetter('e'); // UndoCommands(1); // UndoCommands(5); // TypeLetter('c'); // GetLetter(2); // UndoCommands(2); // GetLetter(2); // }
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