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Submission #1017325

# Submission time Handle Problem Language Result Execution time Memory
1017325 2024-07-09T07:24:10 Z nathan4690 Feast (NOI19_feast) C++17
4 / 100
 64 ms 14940 KB 
// NOI19 Task 3: Feast
// https://oj.uz/problem/view/NOI19_feast
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define el cout << '\n'
#define f1(i,n) for(ll i=1;i<=n;i++)
#define __file_name ""
using namespace std;
const ll maxn = 1e6+5, inf=1e18;

ll n,k,a[maxn],L,R,mid;
pair<ll,ll> dp[2][maxn];

pair<ll,ll> check(ll lambda){
    // Penalty is lambda per subarray
    dp[1][0] = {-1e9, 0};
    f1(i,n){
        dp[0][i] = max(dp[0][i-1], dp[1][i-1]);
        dp[1][i] = max(make_pair(dp[1][i-1].first + a[i], dp[1][i-1].second),
                       make_pair(dp[0][i-1].first + a[i] - lambda, dp[0][i-1].second + 1));
    }
    return max(dp[0][n], dp[1][n]);
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

    if(fopen(__file_name ".inp", "r")){
        freopen(__file_name ".inp","r",stdin);
        freopen(__file_name ".out","w",stdout);
    }
    // code here
    cin >> n >> k;
    f1(i,n) cin >> a[i];
    L = 0; R = 1e13;
    while(L <= R){
        mid = (L+R)/2;
        if(check(mid).second >= k) L = mid+1;
        else R = mid-1;
    }
    // cout << L << ' ' << R << ' ' << check(L).second;el;
    pair<ll,ll> res = check(R);
    // cout << res.second;el;
    cout << res.first + res.second * R;
    return 0;
}

/*
Code by: Nguyen Viet Trung Nhan
Cau Giay Secondary School
*/

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen(__file_name ".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(__file_name ".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 13396 KB Output is correct
2 Correct 44 ms 13788 KB Output is correct
3 Correct 54 ms 13784 KB Output is correct
4 Correct 51 ms 13776 KB Output is correct
5 Correct 44 ms 13652 KB Output is correct
6 Correct 44 ms 13648 KB Output is correct
7 Correct 44 ms 14676 KB Output is correct
8 Correct 44 ms 14928 KB Output is correct
9 Correct 45 ms 13660 KB Output is correct
10 Correct 51 ms 13792 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 14796 KB Output is correct
2 Correct 40 ms 14940 KB Output is correct
3 Correct 38 ms 13656 KB Output is correct
4 Incorrect 38 ms 14684 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 64 ms 13656 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 0 ms 2396 KB Output is correct
8 Incorrect 1 ms 4444 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 0 ms 2396 KB Output is correct
8 Incorrect 1 ms 4444 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 0 ms 2396 KB Output is correct
8 Incorrect 1 ms 4444 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 13396 KB Output is correct
2 Correct 44 ms 13788 KB Output is correct
3 Correct 54 ms 13784 KB Output is correct
4 Correct 51 ms 13776 KB Output is correct
5 Correct 44 ms 13652 KB Output is correct
6 Correct 44 ms 13648 KB Output is correct
7 Correct 44 ms 14676 KB Output is correct
8 Correct 44 ms 14928 KB Output is correct
9 Correct 45 ms 13660 KB Output is correct
10 Correct 51 ms 13792 KB Output is correct
11 Correct 45 ms 14796 KB Output is correct
12 Correct 40 ms 14940 KB Output is correct
13 Correct 38 ms 13656 KB Output is correct
14 Incorrect 38 ms 14684 KB Output isn't correct
15 Halted 0 ms 0 KB -