제출 #704631

#제출 시각아이디문제언어결과실행 시간메모리
704631CyanmondGlobal Warming (CEOI18_glo)C++17
62 / 100
168 ms14280 KiB
#include <bits/stdc++.h> using i64 = long long; constexpr i64 inf = 1ll << 50; int main() { int N; i64 X; std::cin >> N >> X; std::vector<i64> T(N); for (auto &e : T) { std::cin >> e; } std::set<std::pair<i64, int>> dp1, dp2; dp1.insert({0, 0}); dp2.insert({0, 0}); for (int i = 0; i < N; ++i) { // normal auto itr = dp2.lower_bound({T[i], 0}); if (itr == dp2.end()) { --itr; dp2.insert({T[i], itr->second + 1}); } else { const int l = itr->second; dp2.erase(itr); dp2.insert({T[i], l}); } // special itr = dp1.lower_bound({T[i] + X, 0}); std::pair<i64, int> p = {-1, -1}; if (itr == dp1.end()) { --itr; p = std::make_pair(T[i], itr->second + 1); } else { p = std::make_pair(T[i], itr->second); } itr = dp2.lower_bound({T[i], N + 1}); --itr; if (itr->second < p.second) { dp2.insert(p); itr = dp2.lower_bound(p); --itr; if (itr->first == T[i]) { dp2.erase(itr); } itr = dp2.upper_bound(p); while (itr != dp2.end() and itr->second <= p.second) { itr = dp2.erase(itr); } } // normal itr = dp1.lower_bound(std::make_pair(T[i], 0)); if (itr == dp1.end()) { --itr; dp1.insert({T[i], itr->second + 1}); } else { const int l = itr->second; dp1.erase(itr); dp1.insert({T[i], l}); } } std::cout << std::max(dp1.rbegin()->second, dp2.rbegin()->second) << std::endl; }
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