제출 #654076

#제출 시각아이디문제언어결과실행 시간메모리
654076thiago_bastosXylophone (JOI18_xylophone)C++17
47 / 100
90 ms328 KiB
#include "xylophone.h" #include <bits/stdc++.h> using namespace std; void solve(int N) { int l = 1, r = N + 1; while(l < r) { int m = (l + r) / 2; if(query(m, N) != N - 1) r = m; else l = m + 1; } int k = r - 1; vector<int> P(N + 1, -1); vector<bool> vis(N + 1, false); P[k] = 1; P[k + 1] = 1 + query(k, k + 1); vis[1] = vis[P[k + 1]] = true; auto f = [&](int l, int r, int i) { int d = query(min({l,r,i}), max({l,r,i})); if(d == abs(P[l] - P[r])) P[i] = P[l] > P[r] ? P[l] - query(min(l,i), max(l,i)) : P[l] + query(min(l,i), max(l,i)); else { int lo = min(P[l], P[r]) + d, hi = max(P[l], P[r]) - d; if(lo <= N && hi >= 1 && !vis[lo] && !vis[hi]) { int d2 = query(min(l,i), max(l,i)); P[i] = P[l] > P[r] ? (P[l] + (d == d2 ? -d : d2)) : (P[l] + (d == d2 ? d : -d2)); } else P[i] = lo > N || vis[lo] ? hi : lo; } vis[P[i]] = true; }; for(int i = k + 2; i <= N; ++i) f(i - 1, i - 2, i); for(int i = k - 1; i; --i) f(i + 1, i + 2, i); for(int i = 1; i <= N; ++i) answer(i, P[i]); }
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