제출 #827183

#제출 시각아이디문제언어결과실행 시간메모리
827183Desh03크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++17
100 / 100
352 ms137716 KiB
#include <bits/stdc++.h> using namespace std; const int N = 1e6; int L[20 * N], R[20 * N], t; char s[20 * N]; void upd(int &v, int l, int r, const int &x, const char &z) { ++t; L[t] = L[v]; R[t] = R[v]; v = t; if (l == r) { s[v] = z; return; } int m = l + r >> 1; if (x <= m) upd(L[v], l, m, x, z); else upd(R[v], m + 1, r, x, z); s[v] = s[L[v]] + s[R[v]]; } char qry(int v, int l, int r, const int &x) { if (l == r) return s[v]; int m = l + r >> 1; return x <= m ? qry(L[v], l, m, x) : qry(R[v], m + 1, r, x); } vector<pair<int, int>> st; void Init() { st.push_back({0, 0}); } void TypeLetter(char L) { st.push_back(st.back()); upd(st.back().first, 0, N - 1, st.back().second++, L); } void UndoCommands(int U) { st.push_back(st[st.size() - U - 1]); } char GetLetter(int P) { return qry(st.back().first, 0, N - 1, P); }

컴파일 시 표준 에러 (stderr) 메시지

scrivener.cpp: In function 'void upd(int&, int, int, const int&, const char&)':
scrivener.cpp:18:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   18 |     int m = l + r >> 1;
      |             ~~^~~
scrivener.cpp: In function 'char qry(int, int, int, const int&)':
scrivener.cpp:26:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   26 |     int m = l + r >> 1;
      |             ~~^~~
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