Submission #945481

#	Time	Username	Problem	Language	Result	Execution time	Memory
945481		SirCovidThe19th	Feast (NOI19_feast)	C++17	100 / 100	226 ms	12964 KiB

feast

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

const int MAX = 3e5 + 5;

int n, k, A[MAX]; pair<ll, ll> dp[MAX][2];
 
pair<ll, ll> better(pair<ll, ll> a, pair<ll, ll> b){
    if (a.first == b.first) 
        return (a.second < b.second ? a : b);

    return (a.first > b.first ? a : b);
}

bool solve(ll lmb){
    dp[0][0] = {0, 0}; 
    dp[0][1] = {-1e18, 0};
 
    for (int i = 1; i <= n; i++){
        dp[i][0] = better(dp[i - 1][0], dp[i - 1][1]);

        dp[i][1] = better(
            {dp[i - 1][0].first + A[i] - lmb, dp[i - 1][0].second + 1}, 
            {dp[i - 1][1].first + A[i], dp[i - 1][1].second}
        );
    }
    return better(dp[n][0], dp[n][1]).second <= k;
}
 
int main(){
    ios_base::sync_with_stdio; cin.tie(0);
    cin >> n >> k;

    for (int i = 1; i <= n; i++) 
        cin >> A[i];
 
    ll L = 0, H = 1e15;

    while (L < H){
        ll M = (L + H) / 2;
        solve(M) ? H = M : L = M + 1;
    }
    solve(L);
    
    cout << better(dp[n][0], dp[n][1]).first + L * k << "\n";
}

Compilation message (stderr)

feast.cpp: In function 'int main()':
feast.cpp:33:15: warning: statement is a reference, not call, to function 'std::ios_base::sync_with_stdio' [-Waddress]
   33 |     ios_base::sync_with_stdio; cin.tie(0);
      |     ~~~~~~~~~~^~~~~~~~~~~~~~~
feast.cpp:33:15: warning: statement has no effect [-Wunused-value]

• 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