Submission #1229380

#	Time	Username	Problem	Language	Result	Execution time	Memory
1229380		unnick	Feast (NOI19_feast)	C++20	100 / 100	156 ms	5104 KiB

feast

#include <iostream>
#include <vector>

typedef long long int real_ll;
typedef __int128_t ll;

using namespace std;

#define dbg(v) cout << #v << " = " << v << "\n";

int main() {
    int n, k;
    cin >> n >> k;
    vector<ll> arr(n);
    for (auto &v: arr) {int t; cin >> t; v = t;}
    // vector<ll> b(k*2+1);

    // for (int i = 0; i < n; i++) {
    //     ll a;
    //     cin >> a;
    //     for (int j = k*2-1; j >= 1; j -= 2) {
    //         b[j+1] = max(b[j], b[j+1]);
    //         b[j] = max(b[j], b[j-1]) + a;
    //     }
    // }

    // ll r = 0;
    // for (ll v: b) r = max(v,r);

    ll ah = (((ll) 1)<<64);
    ll al = 0;

    ll r;
    while (ah >= al) {
        ll am = (ah + al) / 2;
        ll pn = 0;
        ll pi = -(((ll) 1)<<120);
        ll scn = 0;
        ll sci = 0;
        for (auto v: arr) {
            if (pi > pn) scn = sci;
            pn = max(pi, pn);
            if (pn-am > pi) sci = scn+1;
            pi = max(pi, pn-am) + v;
        }
        r = max(pn, pi) + (pn > pi ? scn : sci) * am;
        // dbg(am);
        // dbg(pn);
        // dbg(pi);
        // dbg(scn);
        // dbg(sci);
        if (al == ah) break;
        if ((pn > pi ? scn : sci) > k) {
            al = am;
            if (al == am) al++;
        } else {
            ah = am;
        }
    }

    cout << (real_ll) r << "\n";
}

• 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