Submission #1209993

#TimeUsernameProblemLanguageResultExecution timeMemory
1209993nmdminhFeast (NOI19_feast)C++20
0 / 100
229 ms21320 KiB
#define _USE_MATH_DEFINES #include <iostream> #include <iomanip> #include <string> #include <cstring> #include <vector> #include <cmath> #include <set> #include <random> #include <algorithm> #include <ctype.h> #include <sstream> #include <stack> #include <map> #include <queue> #include <numeric> #include <unordered_map> #include <unordered_set> #include <functional> using namespace std; #define endl '\n' typedef long long ll; typedef vector<ll> vl; typedef vector<vl> vvl; typedef pair<ll, ll> ii; typedef vector<ii> vll; const ll lim = 1e9 + 7; const int N = 3 * 1e5 + 5; const ll INF = 1e9 * 300000; ll n, k; ll a[N]; pair<long double, int> dp[N + 1][2]; bool check(long double lambda) { dp[0][0] = { 0, 0 }; dp[0][1] = { -INF, 0 }; for (ll i = 1; i <= n; i++) { dp[i][0] = max(dp[i - 1][1], dp[i - 1][0]); dp[i][1] = max(make_pair(dp[i - 1][1].first + a[i], dp[i - 1][1].second), make_pair(dp[i - 1][0].first + a[i] - lambda, dp[i - 1][0].second + 1)); } if (max(dp[n][1], dp[n][0]).second >= k) return 1; else return 0; } int main() { cin >> n >> k; for (ll i = 1; i <= n; i++) cin >> a[i]; long double l = 0, r = INF; while (r > l + 0.1) { long double mid = (l + r) / 2; if (check(mid)) l = mid; else r = mid; } check(l); cout << round(l * k + max(dp[n][1], dp[n][0]).first); }
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