Submission #440676

#	Time	Username	Problem	Language	Result	Execution time	Memory
440676		Autron	Longest beautiful sequence (IZhO17_subsequence)	C++17	100 / 100	4247 ms	93192 KiB

subsequence

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;

int last[1<<10][1<<10][21];

int main(){
	cin.tie(0);
	ios_base::sync_with_stdio(0);
	int n;
	cin>>n;
	vector<int> len(n+1), pr(n+1), a(n+1), k(n+1);
	for(int i=1;i<=n;++i) cin>>a[i];
	for(int i=1;i<=n;++i) cin>>k[i];
	vector<int> popcnt(1<<20);
	for(int i=0;i<(1<<20);++i){
		popcnt[i]=__builtin_popcount(i);
	}
	for(int i=1;i<=n;++i){
		int lef=a[i]&((1<<10)-1), rig=a[i]>>10;
		for(int mask=0;mask<(1<<10);++mask){
			int tar=k[i]-popcnt[mask&lef];
			auto x=last[mask][rig][tar];
			if(0<=tar&&tar<=10&&(len[i]<len[x])){
				len[i]=len[x];
				pr[i]=x;
			}
		}
		len[i]++;
		for(int mask=0;mask<(1<<10);++mask){
			auto &x=last[lef][mask][popcnt[mask&rig]];
			if(len[x]<len[i]){
				x=i;
			}
		}
	}
	int poz=0;
	len[0]=-1;
	for(int i=1;i<=n;++i){
		if(len[i]>len[poz]) poz=i;
	}
	stack<int> ans;
	cout<<len[poz]<<"\n";
	while(poz){
		ans.push(poz);
		poz=pr[poz];
	}
	while(!ans.empty()) cout<<ans.top()<<" ", ans.pop();
	cout<<"\n";
	return 0;
}

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