Submission #958121

#	Time	Username	Problem	Language	Result	Execution time	Memory
958121		MinaRagy06	Split the sequence (APIO14_sequence)	C++17	22 / 100	720 ms	131072 KiB

sequence

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

const int N = 100'005;
const ll inf = 1e18;
int a[N];
ll prf[N];
array<ll, 2> dp[105][N];
void solve(int j, int l, int r, int optl, int optr) {
	if (l > r) return;
	int i = (l + r) >> 1;
	for (int k = optl; k <= min(i - 1, optr); k++) {
		dp[j][i] = max(dp[j][i], {dp[j - 1][k][0] + prf[k] * (prf[i] - prf[k]), k});
	}
	solve(j, l, i - 1, optl, dp[j][i][1]);
	solve(j, i + 1, r, dp[j][i][1], optr);
}
int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int n, m;
	cin >> n >> m;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		prf[i] = prf[i - 1] + a[i];
	}
	m++;
	for (int i = 1; i <= n; i++) dp[0][i] = {-inf, -1};
	for (int j = 1; j <= m; j++) {
		dp[j][0] = {-inf, -1};
		solve(j, 1, n, 0, n - 1);
	}
	cout << dp[m][n][0] << '\n';
	int j = m, i = n;
	vector<int> ans;
	while (j > 1) {
		ans.push_back(dp[j][i][1]);
		i = dp[j][i][1];
		j--;
	}
	reverse(ans.begin(), ans.end());
	for (auto x : ans) {
		cout << x << ' ';
	}
	cout << '\n';
	return 0;
}

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