Submission #793068

#	Time	Username	Problem	Language	Result	Execution time	Memory
793068		Peter2017	Longest beautiful sequence (IZhO17_subsequence)	C++14	0 / 100	1 ms	340 KiB

subsequence

#include <bits/stdc++.h>
#define fi first
#define se second
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pill pair<int,ll>
#define mem(a, b) memset(a, b, sizeof(a))
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)

using namespace std;

const int N = 1e5 + 5;
const int mod = 1e9 + 7;

template <typename T1, typename T2> bool maxi(T1 &a, T2 b){if (a < b){a = b; return 1;} return 0;}
template <typename T1, typename T2> bool mini(T1 &a, T2 b){if (a > b){a = b; return 1;} return 0;}

int n;
int trace[N];
int a[N], k[N];
int f[N], saveTrace[N];

void load(){
	cin.tie(0)->sync_with_stdio(0);
	// freopen("test.inp", "r", stdin);
	// freopen("test.out", "w", stdout);
}

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

void get_trace(int i){
	if (trace[i] == 0){
		cout << i << ' ';
		return;
	}
	get_trace(trace[i]);
	cout << i << ' ';
}

void sub2(){
	int ans = 0, id = 1;
	for (int i = 1; i <= n; i++){
		f[i] = 1;
		for (int j = 1; j < i; j++)
			if (__builtin_popcount(a[i] & a[j]) == k[f[j] + 1]) if (maxi(f[i], f[j] + 1)) trace[i] = j;
		if (maxi(ans, f[i])) id = i;
	}
	cout << ans << '\n';
	get_trace(id);
}

void solve(){
	int ans = 0, id = 1;
	for (int i = 1; i <= n; i++){
		int Max = f[i];
		for (int mask = 0; mask < MASK(8); mask++){
			if (__builtin_popcount(a[i] & mask) == k[f[mask] + 1]){
				if (maxi(Max, f[mask] + 1)){
					trace[i] = saveTrace[mask];
					saveTrace[a[i]] = i;
				}
			}
		}
		f[i] = Max;
		if (!f[a[i]]) f[a[i]] = 1, saveTrace[a[i]] = i;
		if (maxi(ans, f[a[i]])) id = i;
	}
	cout << ans << '\n';
	get_trace(id);
}

int main(){
	load();
	input();
	if (n <= 5000) sub2();
	else solve();
} 

/*
4
1 2 3 4 
10 0 1 0

5
5 3 5 3 5
10 1 20 1 20
*/

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