Submission #1006679

#	Time	Username	Problem	Language	Result	Execution time	Memory
1006679		Muaath_5	Longest beautiful sequence (IZhO17_subsequence)	C++17	23 / 100	81 ms	2020 KiB

subsequence

#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
using namespace std;

const int N = 1e5+5;

int n, a[N], k[N];
int dp[N];
int prv[N];

void sub1_2()
{
	for (int i = 1; i <= n; i++) {
		dp[i] = 1;
		for (int j = 1; j < i; j++) {
			if (__builtin_popcount(a[i]&a[j]) == k[i]) {
				if (dp[j]+1 > dp[i]) {
					dp[i] = dp[j]+1;
					prv[i] = j;	
				}			
			}
		}
	}
	int idx = max_element(dp, dp+n+1)-dp;
	
	vector<int> lis;
	while (idx) {
		lis.push_back(idx);
		idx = prv[idx];
	}
	reverse(lis.begin(), lis.end());
	cout << lis.size() << '\n';
	for (int i:lis) cout << i << ' ';
	exit(0);
}


int lst[1<<8];

int main()
{
	ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	cin >> n;
	for (int i = 1; i <= n; cin >> a[i++]);
	for (int i = 1; i <= n; cin >> k[i++]);
	
	if (n <= 5000) sub1_2();
	
	
	for (int i = 1; i <= n; i++) {
		dp[i] = 1;
		for (int jj = 0; jj < (1<<8); jj++) {
			if (!lst[jj]) continue;
			const int j = lst[jj];
			assert(jj == a[j]);
			if (__builtin_popcount(a[i]&a[j]) == k[i]) {
				if (dp[j]+1 > dp[i]) {
					dp[i] = dp[j]+1;
					prv[i] = j;
				}			
			}
		}
		lst[a[i]] = i;
	}
	int idx = max_element(dp, dp+n+1)-dp;
	
	vector<int> lis;
	while (idx) {
		lis.push_back(idx);
		idx = prv[idx];
	}
	reverse(lis.begin(), lis.end());
	cout << lis.size() << '\n';
	for (int i:lis) cout << i << ' ';
}

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