Submission #623976

#	Time	Username	Problem	Language	Result	Execution time	Memory
623976		Arnch	Split the sequence (APIO14_sequence)	C++17	0 / 100	7 ms	2004 KiB

sequence

// oooo
/*
 har chi delet mikhad bebar ~
 gitar o ba khodet nabar! ~
 ;Amoo_Hasan;
*/

#include<bits/stdc++.h>
//#pragma GCC optimize("O3,no-stack-protector,unroll-loops")
//#pragma GCC target("avx2,fma")

using namespace std;

typedef long long ll;
typedef long double ld;

#define Sz(x) int((x).size())
#define All(x) (x).begin(), (x).end()
#define wtf(x) cout<<#x <<" : " <<x <<endl
#define mak make_pair

constexpr ll inf = 1e18, N = 1e6 + 10, mod = 1e9 + 7, pr = 1000696969;

ll a[N], ps[N];
bool mark[N];

inline pair<ll, ll> Solve(int l, int r) {
	ll ans = 0, sum = 0, pos = 0;
	sum = ps[r - 1] - ps[l - 1];
	for(int i = l; i < r - 1; i++) {
		ll val = ps[i] - ps[l - 1];
		val *= (sum - val);
		if(val >= ans) {
			ans = val, pos = i;
		}
	}
	return mak(ans, pos + 1);
}

int main() {
    ios :: sync_with_stdio(0), cin.tie(0);

	int n, k; cin >>n >>k;
	for(int i = 1; i <= n; i++) cin >>a[i];

	for(int i = 1; i <= n; i++) ps[i] = ps[i - 1] + a[i];

	vector<int> vc;
	vc.push_back(1), vc.push_back(n + 1);

	ll sum = 0;
	while(k--) {
		ll mx = 0, ind = 0;
		for(int i = 0; i < Sz(vc) - 1; i++) {
			int l = vc[i], r = vc[i + 1];
			if(r - l == 1) continue;
			pair<ll, ll> p = Solve(l, r);
			if(p.first >= mx) ind = p.second;
			mx = max(mx, p.first);
		}
		sum += mx;
		vc.push_back(ind);
		sort(All(vc));
	}

	cout<<sum <<endl;
	for(auto i : vc) {
		if(i != 1 && i != n + 1) cout<<i - 1 <<" ";
	}

    return 0;
}

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