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Submission #939713

# Submission time Handle Problem Language Result Execution time Memory
939713 2024-03-06T16:55:13 Z TrinhKhanhDung Feast (NOI19_feast) C++14
0 / 100
 183 ms 23124 KB 
#include <bits/stdc++.h>

using namespace std;

const int MAX = 3e5 + 10;
const long double EPS = 1e-3;

int N, K;
int a[MAX];
pair<long double, int> dp[MAX][2];

bool OK(long double lambda){
    dp[0][0] = make_pair(0.0, 0);
    dp[0][1] = make_pair(-1.18, 0);
    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][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));
    }

    return max(dp[N][0].second, dp[N][1].second) >= K;
}

int main(){
    ios_base::sync_with_stdio(0);

    cin >> N >> K;
    for(int i=1; i<=N; i++){
        cin >> a[i];
    }

    long double lo = 0, hi = 1e14;
    while(lo + EPS < hi){
        long double mid = (lo + hi) / 2;

        if(OK(mid)){
            lo = mid;
        }
        else{
            hi = mid;
        }
    }

    OK(lo);

    cout << round(lo * K + max(dp[N][0], dp[N][1]).first);

    return 0;
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 180 ms 22876 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 177 ms 21324 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 183 ms 23124 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 180 ms 22876 KB Output isn't correct
2 Halted 0 ms 0 KB -