Submission #1130403

#	Time	Username	Problem	Language	Result	Execution time	Memory
1130403		zhasyn	Longest beautiful sequence (IZhO17_subsequence)	C++20	23 / 100	6085 ms	22548 KiB

subsequence

#include <bits/stdc++.h>
#define pb push_back
#define pf push_front
using namespace std;
#define F first
#define S second
typedef long long ll;
#define pii pair <int, int>
#define pll pair <ll, ll>
typedef long double ld;
const ll N = 5000 + 100, M = 500 + 10, len = 315, inf = 1e18;
const ll mod = 998244353;
ll um(ll a, ll b){
	return (1LL * a * b) % mod;
}
ll subr(ll a, ll b){
	return ((1LL * a - b) % mod + mod) % mod;
}
ll bp(ll x, ll step){
	ll res = 1;
	while(step){
		if(step & 1) res = um(res, x);
		x = um(x, x);
		step /= 2;
	}
	return res;
}
ll inv(ll x){
	return bp(x, mod - 2);
}
bool was[5010][5010];
int check(int a, int b){
	int res = 0;
	while(true){
		if(a == 0 || b == 0) break;
		if(a%2 + b%2 == 2) res++;
		a /= 2;
		b /= 2;
	}
	return res;
}
int a[N], k[N];
int main() {
	//ios_base::sync_with_stdio(false);
	//cin.tie(nullptr);
	//cout.tie(nullptr);
	int n, cnt = 1, num = 0;
	cin >> n;
	for(int i = 0; i < n; i++){
		cin >> a[i];
	}
	for(int i = 0; i < n; i++){
		cin >> k[i];
	}
	for(int i = 0; i < n; i++){
		for(int j = i - 1; j >= 0; j--){
			//cout << i << " "<< j << " "<< k[i] << " "<< check(a[i], a[j]) << endl;
			if(check(a[i], a[j]) != k[i]) continue;
			for(int nw = 1; nw < n; nw++){
				was[i][nw + 1] |= was[j][nw];
				if(was[i][nw + 1] && nw + 1 > cnt){
					cnt = nw + 1;
					num = i;
				}
			}
		}
		was[i][1] = true;
	}
	cout << cnt << endl;
	vector <int> vec;
	while(cnt > 1){
		vec.pb(num);
		cnt--;
		for(int j = num - 1; j >= 0; j--){
			if(check(a[num], a[j]) != k[num]) continue;
			if(was[j][cnt]){
				num = j;
				break;
			}
		}
	}
	cout << num + 1 << " ";
	for(int i = (int)vec.size() - 1; i >= 0; i--){
		cout << vec[i] + 1 << " ";
	}
  return 0;
}

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