제출 #923763

#제출 시각아이디문제언어결과실행 시간메모리
923763KarootFeast (NOI19_feast)C++17
71 / 100
984 ms81744 KiB
#include <iostream> #include <cmath> #include <unordered_map> #include <map> #include <set> #include <queue> #include <vector> #include <string> #include <iomanip> #include <algorithm> #include <chrono> #define all(x) (x).begin(), (x).end() #define rall(x) (x).rbegin(), (x).rend() using namespace std; typedef long long ll; ll linf = 1e15+1; inline void scoobydoobydoo(){ ios::sync_with_stdio(false); ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); } const int MAXN = 3e5+3; ll arr[MAXN]; pair<long double, ll> mem[MAXN][2]; ll n, k; bool isVisited[MAXN][2]; long double lambda; pair<long double, ll> dp(ll index, int inInterval){ if (index == n) return {0, 0}; if (isVisited[index][inInterval])return mem[index][inInterval]; isVisited[index][inInterval] = true; if (inInterval){ //fortsätt -> ingen penalty pair<long double, ll> cont = {dp(index+1, 1).first+arr[index], dp(index+1, 1).second}; pair<long double, ll> stop = {dp(index+1, 0).first, dp(index+1, 0).second}; //stanna -> penalty return mem[index][inInterval] = max(cont, stop); } else { //köp inget pair<long double, ll> cont = {dp(index+1, 0).first, dp(index+1, 0).second}; //starta pair<long double, ll> start = {dp(index+1, 1).first + arr[index] - lambda, dp(index+1, 1).second+1}; return mem[index][inInterval] = max(cont, start); } } bool check(long double la){ lambda = la; for (int i = 0; i < n; i++){ isVisited[i][0] = false; isVisited[i][1] = false; } //cout << la << " " << dp(0, 0).first << " " << dp(0, 0).second << endl; return dp(0,0).second >= k; } int main(){ scoobydoobydoo(); cin >> n >> k; for (int i = 0; i < n; i++)cin >> arr[i]; long double a = 0, b = 1e15; chrono::time_point<chrono::system_clock> start, end; start = chrono::system_clock::now(); while (a+(1e-3) < b){ long double mid = (a+b)/2.0; if (check(mid)){ a = mid; } else { b = mid; } end = chrono::system_clock::now(); chrono::duration<double> elapsed_seconds = end - start; if (elapsed_seconds.count() > 0.9)break; } check(a); //cout << fixed << setprecision(5); //cout << a << endl; //cout << check(6.99) << endl; //cout << check(7.99) << endl; ll ans = round(a*k + mem[0][0].first); cout << ans << endl; return 0; }
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