Submission #416245

#	Time	Username	Problem	Language	Result	Execution time	Memory
416245		DEQK	Split the sequence (APIO14_sequence)	C++17	100 / 100	1062 ms	80944 KiB

sequence

#include <bits/stdc++.h>
 
#define ll long long
using namespace std;
const int N = 100100;
int n, k;
ll a[N];
ll dp[N][2];
int p[201][N];
int cur;
void solve(int l,int r,int tl,int tr) {
	if(l > r) return;
	int m = l + r >> 1;
	for(int i = tl; i < min(m, tr + 1); i++) {
		if(dp[m][1] <= dp[i][0] + a[i] * (a[m] - a[i])) {
			dp[m][1] = dp[i][0] + a[i] * (a[m] - a[i]);
			p[cur][m] = i;
		}
	}
	solve(l, m - 1, tl, p[cur][m]);
	solve(m + 1, r, p[cur][m], tr);
}
int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> n >> k;
	for(int i = 1; i <= n; ++i) {
		cin >> a[i];
		a[i] += a[i - 1];
	}
	for(int j = 1; j <= k; j++) {
		cur = j;
		solve(1, n, 1, n);
		for(int i = 1; i <= n; i++) {
			dp[i][0] = dp[i][1];
			dp[i][1] = 0;
		}		
	}
	cout << dp[n][0] << "\n";
	int pos = n;
	for(int j = k; j; j--) {
		cout << p[j][pos] << " ";
		pos = p[j][pos];
	}
}

Compilation message (stderr)

sequence.cpp: In function 'void solve(int, int, int, int)':
sequence.cpp:13:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   13 |  int m = l + r >> 1;
      |          ~~^~~

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