Submission #433897

#	Time	Username	Problem	Language	Result	Execution time	Memory
433897		Azimjon	Triple Jump (JOI19_jumps)	C++17	5 / 100	4077 ms	7492 KiB

jumps

// Muallif: Azimjon Mehmonali o'g'li

#include <bits/stdc++.h>

using namespace std;

#define int long long

const long double PI = 3.1415926535897;
const int mod = 1000000007LL;
const int INF = 1e18;

const int N = 500500;

int a[N], b[N], t[4 * N];
int n;

void build(int v = 1, int tl = 1, int tr = n) {
	if (tl == tr) {
		t[v] = a[tl];
		return;
	}

	int tm = (tl + tr) / 2;

	build(v + v, tl, tm);
	build(v + v + 1, tm + 1, tr);

	t[v] = max(t[v + v], t[v + v + 1]);
}

int get(int l, int r, int v = 1, int tl = 1, int tr = n) {
	if (r < tl || tr < l) return 0;

	if (l <= tl && tr <= r) {
		return t[v];
	}

	int tm = (tl + tr) / 2;

	return max(get(l, r, v + v, tl, tm), get(l, r, v + v + 1, tm + 1, tr));
}

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

	cin >> n;

	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		b[i] = a[i];
	}

	build();

	int q;
	cin >> q;

	function<int(int, int, int)> f = [&](int l, int r, int first) {
		// cerr << l << " " << r << endl;
		// if (r - l + 1 <= 2) return 0ll;
		vector<pair<int, int>> v;
		for (int i = l; i <= r; i++) {
			v.emplace_back(a[i], i);
		}

		sort(v.rbegin(), v.rend());

		int tl = v[0].second, tr = v[1].second;

		if (tl > tr) {
			swap(tl, tr);
		}

		int re = 0;

		for (int i = 1; i <= n; i++) {
			vector<int> d{tl, tr, i};
			sort(d.begin(), d.end());
			if (i == tl || i == tr || l > i || i > r
				|| d[2] - d[1] < d[1] - d[0])
				continue;

			re = max(re, a[i]);
		}

		int ans = v[0].first + v[1].first + re;

		if (!first) return ans;

		a[v[0].second] = 0;
		ans = max(ans, f(l, r, first - 1));

		a[v[1].second] = 0;
		ans = max(ans, f(l, r, first - 1));

		a[v[0].second] = b[v[0].second];
		a[v[1].second] = b[v[1].second];
		return ans;
	};

	auto ff = [&](int l, int r) {
		int ans = 0;
		for (int i = l; i <= r; i++) {
			for (int j = i + 1; j <= r; j++) {
				// for (int k = j + j - i; k <= r; k++) {
				ans = max(ans, a[i] + a[j] + get(j + j - i, r));
				// }
			}
		}

		return ans;
	};

	while (q--) {
		int l, r;
		cin >> l >> r;

		cout << ff(l, r) << endl;
	}

	return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 27
• Subtask 4: 0 / 54