Submission #1209950

#	Time	Username	Problem	Language	Result	Execution time	Memory
1209950		raphaeltfa	Feast (NOI19_feast)	C++20	100 / 100	914 ms	23916 KiB

feast

#include <bits/stdc++.h>
using namespace std;
#define int long long

pair<int, int> lambda_func(int lmb, const vector<int> &base){
    vector<vector<pair<int, int>>> dp(base.size(), vector<pair<int, int>> (2, {0, 0}));
    dp[0][0] = {0, 0}, dp[0][1] = {base[0] - lmb, 1};
    for(int i = 1; i < base.size(); i++){
        dp[i][0] = max(dp[i - 1][0], dp[i - 1][1]);
        dp[i][1] = max( make_pair(dp[i - 1][0].first + base[i] - lmb, dp[i - 1][0].second + 1), 
                        make_pair(dp[i - 1][1].first + base[i], dp[i - 1][1].second));
    } return max(dp.back()[0], dp.back()[1]);
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    int n, m; cin >> n >> m;
    vector<int> base(n);
    for(int & i : base) cin >> i;
    int left = 0, right = 1e18;
    while(left < right){
        int mid = (left + right + 1) / 2;
        pair<int, int> res = lambda_func(mid, base);
        if(res.second >= m) left = mid;
        else right = mid - 1;
    } int res = lambda_func(left, base).first + left * m;
    cout << res << endl;
}

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 18 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 20 / 20
• Subtask 7: 29 / 29