제출 #915410

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
915410		Pekiban	수열 (APIO14_sequence)	C++17	0 / 100	16 ms	4700 KiB

sequence

#include <bits/stdc++.h>
 
using namespace std;
 
const int mxN = 1e5+2, mxK = 202;
int to[mxK][mxN];
long long pref[mxN], dpb[mxN], dp[mxN], c;
long double cord(int x, int y) {
    return (long double)(dpb[y] - pref[y]*pref[y] + pref[x]*pref[x] - dpb[x])/(pref[x] - pref[y]); // deljenje 0-om?
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n, k;
    cin >> n >> k;
    for (int i = 1; i <= n; ++i) {
        int x;
        cin >> x;
        pref[i] = pref[i-1] + x;
    }
    for (int i = 1; i <= k; ++i) {
        deque<int> dq = {0};
        for (int j = 1; j <= n; ++j) {
            while (dq.size() > 1 && cord(dq[0], dq[1]) <= pref[j])   dq.pop_front();
            dp[j] = pref[j]*pref[dq[0]] + dpb[dq[0]] - pref[dq[0]]*pref[dq[0]];
            to[i][j] = dq[0];
            while (dq.size() > 1 && cord(dq[dq.size()-1], dq[dq.size()-2]) >= cord(dq[dq.size()-2], j)) dq.pop_back();
            dq.push_back(j);
        }
        for (int i = 1; i <= n; ++i) {
            dpb[i] = dp[i];
        }
        ++c;
    }
    cout << dp[n] << '\n';
    int idx = to[k][n];
    for (int i = k; i >= 1; --i) {
        cout << idx << ' ';
        idx = to[k][idx];
    }
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 11
• Subtask 3: 0 / 11
• Subtask 4: 0 / 17
• Subtask 5: 0 / 21
• Subtask 6: 0 / 29