Submission #1141146

#	Time	Username	Problem	Language	Result	Execution time	Memory
1141146		Shadow1	Feast (NOI19_feast)	C++20	63 / 100	163 ms	327680 KiB

feast

// Programmer: Shadow1

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
using namespace std;

using ll = long long;
using ld = long double;
using ull = unsigned long long;
using str = string; // yay python!

#define i64 int64_t
#define show(x) cerr << (#x) << " = " << (x) << '\n';
#define output_vector(v) for(auto &x : v){cout << x << ' ';}cout << '\n';
#define output_pairvector(v) for(auto &x : v){cout << x.first << " " << x.second << '\n';}
#define read_vector(v) for(auto &x : v){cin >> x;}
#define vt vector
#define prq priority_queue
#define pb push_back
#define eb emplace_back
#define pii pair<int,int>
#define fir first
#define sec second
#define sz(x) ll(x.size())
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define int long long
#define discretize(x) sort(x.begin(), x.end()); x.erase(unique(x.begin(), x.end()), x.end());
// 
//

void solve() {
    int n, k;
    cin >> n >> k;
    vector<int> a(n+1), p(n+1);
    bool pos = true;
    for(int i=1; i<=n; ++i) {
        cin >> a[i];
        if(a[i] < 0) pos = false;
        p[i] = p[i-1] + a[i];
    }
    int ans = 0;
    if(pos) {
        for(auto &A : a) ans += A;
        cout << ans << '\n';
        return;
    }
    int dp[n+1][k+1];
    memset(dp, 0, sizeof(dp));
    vector<priority_queue<int>> pq(k+1);
    for(int i=0; i<=k; ++i)
        pq[i].push(0);
    for(int i=1; i<=n; ++i) {
        for(int j=0; j<=min(i, k); ++j) {
            dp[i][j] = dp[i-1][j];
            if(j > 0) {
                dp[i][j] = max(dp[i-1][j], pq[j-1].top() + p[i]);
            }
            pq[j].push(dp[i][j] - p[i]);
        }
    }
    cout << dp[n][k] << '\n';
}



// CHECK YOUR OVERFLOWS!!!! 
signed main() {
    // freopen("output.txt", "w", stdout);
    // freopen("input.txt", "r", stdin);
    ios::sync_with_stdio(false);
    cin.tie(NULL); 
    int T = 1;
    // cin >> T;
    for(int tc = 1; tc <= T; ++tc) {
        // cout << "Case #" << tc << ": ";
        solve();
    }

    return 0;
}

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