Submission #1215002

#	Time	Username	Problem	Language	Result	Execution time	Memory
1215002		long290429	Feast (NOI19_feast)	C++20	53 / 100	1024 ms	22716 KiB

feast

#include<bits/stdc++.h>
using namespace std;
const int MAXN=3e5+5;
int n;
long long k;
int a[MAXN];
pair<long long,long long> test(long long lmb) {
	vector<vector<pair<long long, long long>>>dp(n,vector<pair<long long,long long>>(2));
	dp[0][0] = {0, 0};
	dp[0][1] = {a[0] - lmb, 1};
	for (int i = 1; i < n; i++) {
		dp[i][0] = max(dp[i - 1][0], dp[i - 1][1]);
		dp[i][1] =
			    max(make_pair(dp[i - 1][0].first + a[i] - lmb, dp[i - 1][0].second + 1),
			        make_pair(dp[i - 1][1].first + a[i], dp[i - 1][1].second));
	}
	return max(dp[n - 1][0], dp[n - 1][1]);
};
int main() {
    cin >> n >> k;
    for(int i=0;i<n;++i) cin >> a[i];
    long long l=0,r=1e18;
    while(l<r) {
        long long mid=(l+r+1)/2;
        pair<long long,long long> p=test(mid);
        if(p.second>=k) {
            l=mid;
        }
        else {
            r=mid-1;
        }
    }
    cout << test(l).first+l*k;
}

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 0 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 20 / 20
• Subtask 7: 0 / 29