Submission #1283713

#	Time	Username	Problem	Language	Result	Execution time	Memory
1283713		am_aadvik	Triple Jump (JOI19_jumps)	C++20	32 / 100	4093 ms	37940 KiB

jumps

#include <iostream>
#include <vector>
#include <algorithm>
#define int long long
const int inf = 1e17;
using namespace std;

vector<vector<int>> st;
vector<int> lg2;
int rmx(int l, int r) {
	if (l > r) return -inf;
	int lg = lg2[(r - l + 1)];
	return max(st[lg][l], st[lg][r - (1ll << lg) + 1]);
}
int32_t main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n; cin >> n;
	vector<int>  a(n);
	for (auto& x : a) cin >> x;
	lg2.resize(n + 1);
	for (int i = 2; i <= n; ++i)
		lg2[i] = lg2[i >> 1] + 1;
	st.resize(lg2[n] + 1, vector<int>(n, -inf));
	for (int i = 0; i < n; ++i) st[0][i] = a[i];
	for (int j = 1; j <= lg2[n]; ++j)
		for (int i = 0; i < n; ++i)
			if ((i + (1ll << (j - 1))) < n)
				st[j][i] = max(st[j - 1][i], st[j - 1][i + (1ll << (j - 1))]);

	int q; cin >> q;
	while (q--) {
		int l, r, ans = 0; cin >> l >> r; --l, --r;
		vector<pair<int, int>> arr;
		for (int i = l; i <= r; ++i)
			arr.push_back({ a[i], i });
		sort(arr.begin(), arr.end(), greater<pair<int, int>>());
		for (int j = 0; j < min((int)arr.size(), 20ll); ++j)
			for (int i = l; i <= r; ++i)
				if (i != arr[j].second) {
					int x = min(i, arr[j].second);
					int y = max(i, arr[j].second);
					int mx = rmx(y + (y - x), r);
					int mx2 = rmx(max(l, x - (y - x) + 1), x - 1);
					ans = max(ans, a[i] + arr[j].first + max(mx2, mx));
				}
		cout << ans << endl;
	}
}

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