제출 #463413

#제출 시각아이디문제언어결과실행 시간메모리
463413tengiz05Exam (eJOI20_exam)C++17
12 / 100
56 ms2284 KiB
#include <bits/stdc++.h> using i64 = long long; constexpr int N = 5005; int main() { std::ios::sync_with_stdio(false); std::cin.tie(nullptr); int n; std::cin >> n; std::vector<int> a(n), b(n), c; for (int i = 0; i < n; i++) { std::cin >> a[i]; c.push_back(a[i]); } for (int i = 0; i < n; i++) { std::cin >> b[i]; c.push_back(b[i]); } std::sort(c.begin(), c.end()); c.erase(std::unique(c.begin(), c.end()), c.end()); for (int i = 0; i < n; i++) { a[i] = std::lower_bound(c.begin(), c.end(), a[i]) - c.begin(); b[i] = std::lower_bound(c.begin(), c.end(), b[i]) - c.begin(); } if (n <= 5000) { std::vector<int> dp(n + 1); for (int i = 1; i <= n; i++) { std::vector<int> cnt(c.size()); for (int j = i, mx = 0; j >= 1; j--) { mx = std::max(mx, a[j - 1]); cnt[b[j - 1]]++; dp[i] = std::max(dp[i], dp[j - 1] + cnt[mx]); } for (int j = i, mx = 0; j >= 1; j--) { mx = std::max(mx, a[j - 1]); if (mx == b[j - 1]) { dp[j] = std::max(dp[j], dp[j - 1] + 1); } } } std::cout << dp[n] << "\n"; } else { if (std::count(b.begin(), b.end(), b[0]) == n) { std::vector<int> t(n, 0); for (int i = 0; i < n; i++) { if (a[i] == b[0]) { int j = i; while (j >= 0 && a[j] <= b[0] && !t[j]) { t[j--] = 1; } j = i + 1; while (j < n && a[j] <= b[0] && !t[j]) { t[j++] = 1; } } } std::cout << std::accumulate(t.begin(), t.end(), 0) << "\n"; } else { } } return 0; }
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