Submission #1208247

#	Time	Username	Problem	Language	Result	Execution time	Memory
1208247		KindaGoodGames	Feast (NOI19_feast)	C++20	100 / 100	447 ms	16844 KiB

feast

#include<bits/stdc++.h>

#define ll long long
#define int long long
#define pii pair<int,int>
#define tiii tuple<int,int,int>
using namespace std;

vector<int> arr;
    int n,k;
    int INF = numeric_limits<int>::max()/2;

pii calc(int lambda){
    vector<vector<pii>> dp(2, vector<pii>(n+1, {-INF, 0}));

    dp[0][0] = {0,0};

    for(int i = 1; i <= n; i++){
        dp[0][i] = max(dp[0][i-1], dp[1][i-1]); 
        pii cand1 = {dp[0][i-1].first+arr[i-1]-lambda,dp[0][i-1].second+1};
        pii cand2 = {dp[1][i-1].first + arr[i-1], dp[1][i-1].second};
        dp[1][i] = max(cand1, cand2); 
    }

    return max(dp[0][n], dp[1][n]);
}

int32_t main(){
    cin >> n >> k;
    arr.resize(n);

    for(int i = 0; i < n; i++){
        cin >> arr[i];
    }

    int l = 0, r = INF;
    int val = 0;
    int ma = 0;
    while(l <= r){
        int mid = (l+r)/2;
        auto cur = calc(mid);
        int v = cur.first + (cur.second * mid);
        if(cur.second <= k){
            ma = max(ma, v);

        }
        if(cur.second >= k){
            l = mid+1;
        }else{
            r = mid-1; 
        }
    }

    cout << ma << 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