Submission #163794

#	Time	Username	Problem	Language	Result	Execution time	Memory
163794		MvC	Longest beautiful sequence (IZhO17_subsequence)	C++11	23 / 100	6017 ms	12280 KiB

subsequence

#pragma GCC target("avx2")
#pragma GCC optimization("O3")
#pragma GCC optimization("unroll-loops")
#include <bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=2e6+50;
const int mod=1e9+7;
using namespace std;
int n,i,a[nmax],k[nmax],ls[nmax],mx,j,x,y,t;
pair<int,int>f[nmax],g[nmax];
vector<int>rs,vc[25];
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	cin>>n;
	for(i=1;i<=n;i++)cin>>a[i];
	for(i=1;i<=n;i++)cin>>k[i];
	for(i=1;i<=n;i++)f[i]=mkp(1,i);
	for(i=1;i<=n;i++)
	{
		for(j=0;j<=20;j++)vc[j].clear();
		for(j=0;j<(1<<10);j++)
		{
			x=__builtin_popcount((j<<10)&a[i]);
			if(x<=k[i])vc[x].pb(j<<10);
			if(ls[j<<10] && x==k[i] && g[j<<10].fr>=f[i].fr)f[i]=mkp(g[j<<10].fr+1,g[j<<10].sc);
		}
		for(j=0;j<(1<<10);j++)
		{
			x=__builtin_popcount(j&a[i]);
			if(x>k[i])continue;
			if(ls[j] && x==k[i] && g[j].fr>=f[i].fr)f[i]=mkp(g[j].fr+1,g[j].sc);
			for(t=0;t<(int)vc[k[i]-x].size();t++)
			{
				y=vc[k[i]-x][t]^j;
				if(ls[y] && g[y].fr>=f[i].fr)f[i]=mkp(g[y].fr+1,g[y].sc);
			}
		}
		if(f[mx].fr<f[i].fr)mx=i;
		g[a[i]]=max(g[a[i]],mkp(f[i].fr,i));
		ls[a[i]]=i;
	}
	while(1)
	{
		rs.pb(mx);
		if(f[mx].fr==1)break;
		mx=f[mx].sc;
	}
	reverse(rs.begin(),rs.end());
	cout<<(int)rs.size()<<endl;
	for(i=0;i<(int)rs.size();i++)cout<<rs[i]<<" ";
	cout<<endl;
	return 0;
}

Compilation message (stderr)

subsequence.cpp:2:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("O3")
 
subsequence.cpp:3:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("unroll-loops")

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