Submission #506653

#	Time	Username	Problem	Language	Result	Execution time	Memory
506653		abc864197532	Longest beautiful sequence (IZhO17_subsequence)	C++17	23 / 100	58 ms	4144 KiB

subsequence

#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mp make_pair
#define eb emplace_back
#define pb push_back
#define X first
#define Y second
#define pii pair<int, int>
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T i, U ...j) {
	cout << i << ' ', abc(j...);
}
template <typename T> void printv(T l, T r) {
	for (; l != r; ++l)
		cout << *l << " \n"[l + 1 == r];
}
#define test(x...) abc("[" + string(#x) + "]", x);
const int N = 200000;

int main () {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	vector <int> a(n), k(n);
	for (int i = 0; i < n; ++i)
		cin >> a[i];
	for (int i = 0; i < n; ++i)
		cin >> k[i];
	if (n <= 5000) {
		vector <int> dp(n, 0), bck(n, -1);
		for (int i = 0; i < n; ++i) {
			dp[i] = 1;
			for (int j = 0; j < i; ++j) {
				if (__builtin_popcount(a[j] & a[i]) == k[i] && dp[i] < dp[j] + 1) {
					dp[i] = dp[j] + 1;
					bck[i] = j;
				}
			}
		}
		int mx = max_element(all(dp)) - dp.begin();
		cout << dp[mx] << endl;
		vector <int> ans;
		while (mx != -1) {
			ans.pb(mx + 1);
			mx = bck[mx];
		}
		reverse(all(ans));
		printv(all(ans));
	} else {
		vector <int> dp(n, 0), bck(n, -1);
		vector <pii> tmp(1 << 8, mp(-1, 0));
		for (int i = 0; i < n; ++i) {
			dp[i] = 1;
			for (int j = 0; j < 1 << 8; ++j) {
				if (__builtin_popcount(j & a[i]) == k[i] && dp[i] < tmp[i].X) {
					tie(dp[i], bck[i]) = tmp[i];
				}
			}
			tmp[a[i]] = max(tmp[a[i]], mp(dp[i] + 1, i));
		}
		int mx = max_element(all(dp)) - dp.begin();
		cout << dp[mx] << endl;
		vector <int> ans;
		while (mx != -1) {
			ans.pb(mx + 1);
			mx = bck[mx];
		}
		reverse(all(ans));
		printv(all(ans));
	}
}

• Subtask 1: 7 / 7
• Subtask 2: 16 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 60