Submission #770695

#	Time	Username	Problem	Language	Result	Execution time	Memory
770695		OrazB	Split the sequence (APIO14_sequence)	C++17	11 / 100	2081 ms	1496 KiB

sequence

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,
             tree_order_statistics_node_update>
    ordered_set;
//Dijkstra->set
//set.find_by_order(x) x-position value
//set.order_of_key(x) number of strictly less elements don't need *set.??
#define wr cout << "Continue debugging\n";
#define all(x) (x).begin(), (x).end()
#define ll long long int
#define pii pair <int, int>
#define pb push_back
#define ff first
#define ss second

const int N = 100005;
const ll INF = 1e18;
int n, k, a[N];
ll pref[N];

pair<ll, vector<int>> F(int l, int r, int k){
	if (l == r or k <= 0) return {0, {}};
	ll mx = -INF;
	vector<int> ans;
	for (int i = l; i < r; i++){
		ll cur = 0;
		pair<ll, vector<int>> X, Y;
		int l1 = 0, r1 = k-1;
		while(l1 <= r1){
			int md = (l1+r1)/2;
			pair<ll, vector<int>> x, y;
			x = F(l, i, md);
			y = F(i+1, r, k-md-1);
			if (cur < x.ff+y.ff){
				cur = x.ff+y.ff;
				X = x; Y = y;
			}
			if (x.ff>y.ff) r1=md-1;
			else l1=md+1;
		}
		ll val = (pref[i]-pref[l-1])*(pref[r]-pref[i]);
		if (mx < cur+val){
			mx = cur+val; 
			ans.clear(); ans.pb(i);
			ans.insert(ans.end(), all(X.ss));
			ans.insert(ans.end(), all(Y.ss));
		}	
	}
	return {mx, ans};
}

int main ()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cin >> n >> k;
	for (int i = 1; i <= n; i++){
		cin >> a[i];
		pref[i] = pref[i-1]+a[i];	
	}
	pair<ll,vector<int>> ans = F(1, n, k);
	cout << ans.ff << '\n';
	for (auto i : ans.ss) cout << i << " ";
}	

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