제출 #243481

#제출 시각아이디문제언어결과실행 시간메모리
243481AlexPop28비밀 (JOI14_secret)C++11
100 / 100
515 ms4600 KiB
#include <bits/stdc++.h> #include "secret.h" using namespace std; int logn, size; vector<vector<int>> st; void Init(int n, int a[]) { logn = 32 - __builtin_clz(n); size = 1 << logn; st.resize(logn, vector<int>(size)); for (int i = 0; i < n; ++i) { st[0][i] = a[i]; } for (int h = 1; h < logn; ++h) { int half = 1 << h, full = 1 << (h + 1); for (int i = half; i < n; i += full) { st[h][i - 1] = a[i - 1]; for (int j = i - 2; j >= i - half; --j) { st[h][j] = Secret(a[j], st[h][j + 1]); } st[h][i] = a[i]; for (int j = i + 1; j < i + half; ++j) { if (j < n) st[h][j] = Secret(st[h][j - 1], a[j]); else st[h][j] = st[h][j - 1]; } } } } int Query(int l, int r) { if (l == r) return st[0][l]; int h = 31 - __builtin_clz(l ^ r); return Secret(st[h][l], st[h][r]); }
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