Go: package main

import "fmt"

func main() {
    var n, m int
    fmt.Scan(&n)

    u := make([]string, 300)

    for i := 0; i < n; i++ {
        fmt.Scan(&u[i])
    }

    fmt.Scan(&m)

    is_lock := true
    for i := 0; i < m; i++ {
        var t string
        fmt.Scan(&t)

        is_include := false
        for j := 0; j < n; j++ {
            if t == u[j] {
                is_include = true
                break
            }
        }
        if is_include == false {
            fmt.Printf("Unknown %s\n", t)
        } else if (is_lock) {
            fmt.Printf("Opened by %s\n", t)
            is_lock = false
        } else {
            fmt.Printf("Closed by %s\n", t)
            is_lock = true
        }
    }
}

C++: #pragma region Macros

#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(long long i=0;i<n;i++)
#define REP(i,s,n) for(long long i=(s);i<=(n);i++)
#define repr(i,n) for(long long i=n-1;i>=0;i--)
#define REPR(i,s,n) for(long long i=(s);i>=(n);i--)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
#define Eunique(v) v.erase(unique(all(v)),v.end())
#define Eback(s) s.erase(s.end()-1,s.end())
#define minvec(v) *min_element(all(v))
#define maxvec(v) *max_element(all(v))
#define sumvec(v) accumulate(all(v),0LL)
#define pb push_back
#define pf push_front
#define m_p make_pair
#define DOUBLE fixed << setprecision(15)
#define OK cerr<<"OK\n"
#define OK1 cerr<<"OK1\n"
#define OK2 cerr<<"OK2\n"
#define sz(s) (long long)s.size()
#define INF ((1LL<<62)-(1LL<<31))
#define zero(x,n) setw(x) << setfill('0') << n
#define endl '\n'

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<long long> vll;
typedef vector<double> vd;
typedef vector<char> vc;
typedef vector<bool> vb;
typedef vector<string> vs;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef vector<vd> vvd;
typedef vector<vc> vvc;
typedef vector<vb> vvb;
typedef pair<ll,ll> P;
typedef vector<P> vP;
typedef queue<ll> qll;
typedef priority_queue<ll> pqll;

template<class A, class B>
ostream& operator<<(ostream& ost, const pair<A, B>&p) {
	ost << "{" << p.first << ", " << p.second << "} ";
	return ost;
}

template<class T>
ostream& operator<<(ostream& ost, const vector<T>&v) {
	ost << "{";
	for (int i = 0; i<(int)v.size(); i++) {
		if (i)ost << " ";
		ost << v[i];
	}
	ost << "} \n";
	return ost;
}

template<class A, class B>
ostream& operator<<(ostream& ost, const map<A, B>&v) {
	ost << "{";
	for (auto p:v) {
		ost << "{" << p.first << ", " << p.second << "} ";
	}
	ost << "} ";
	return ost;
}

void out(){cout << "\n";}
template<class T,class... Args>
void out(const T &x,const Args &... args){
	cout << x << " ";
	out(args...);
}

template<typename T>
istream& operator >> (istream& is, vector<T>& vec){
	for(T& e: vec) is >> e;
	return is;
}

template<typename T>
string join(vector<T>& vec, string sep=" "){
	stringstream ss;
	for(int i=0;i<(int)vec.size();i++){
		ss << vec[i] << (i+1==(int)vec.size()?"\n":sep);
	}
	return ss.str();
}

template<class T>
inline bool chmax(T& a, T b){if(a<b){a=b;return true;} return false;}

template<class T>
inline bool chmin(T& a, T b){if(a>b){a=b;return true;} return false;}

#define INT(...) int __VA_ARGS__;IN(__VA_ARGS__)
#define LL(...) long long __VA_ARGS__;IN(__VA_ARGS__)
#define CHR(...) char __VA_ARGS__;IN(__VA_ARGS__)
#define DBR(...) double __VA_ARGS__;IN(__VA_ARGS__)
#define STR(...) string __VA_ARGS__;IN(__VA_ARGS__)
#define LD(...) long double __VA_ARGS__;IN(__VA_ARGS__)

void scan(int& a){ cin >> a; }
void scan(long long& a){ cin >> a; }
void scan(char& a){ cin >> a; }
void scan(double& a){ cin >> a; }
void scan(string& a){ cin >> a; }
void scan(long double& a){ cin >> a; }

void IN(){}
template<class Head,class... Tail> void IN(Head& head,Tail&... tail){ scan(head); IN(tail...); }

void YES(bool b) {cout << ((b)?"YES\n":"NO\n");}
void Yes(bool b) {cout << ((b)?"Yes\n":"No\n");}
void yes(bool b) {cout << ((b)?"yes\n":"no\n");}
void Yay(bool b) {cout << ((b)?"Yay!\n":":(\n");}

const long double pi = acos(-1.0);
const ll mod=1000000007;
//const ll mod=998244353;

ll powmod(ll a,ll b){ll c=1; while(b>0){ if(b&1){ c=a*c%mod; } a=a*a%mod; b>>=1; } return c;}
ll invmod(ll a){ return powmod(a,mod-2); }
ll nCrmod(ll n,ll r){ll x=1,y=1; for(ll i=0;i<r;i++) {x=x*(n-i)%mod; y=y*(i+1)%mod; } return x*powmod(y,mod-2)%mod;}
ll gcd(ll a,ll b){ while(b){ ll c=b; b=a%b; a=c; } return a; }
ll lcm(ll a,ll b){ if(!a || !b) return 0; return a*b/gcd(a,b); }
vll divisor(ll x){ vll v; for(int i=1;i*i<=x;i++)if(x%i==0){ v.pb(i);if(i*i!=x)v.pb(x/i); } sort(all(v)); return v; };
map<ll,ll> prime_factor(ll n){ map<ll,ll> m; for(ll i=2;i*i<=n;i++){ while(n%i==0){ m[i]++; n /= i; } }if(n!=1) m[n]=1; return m; }

#pragma endregion

int main()
{
	ll n,m;
	string u,t;
	cin >> n;
	map<string,bool> mp;
	rep(i,n){
		cin >> u;
		mp[u]=true;
	}
	cin >> m;
	ll cnt=0;
	rep(i,m){
		cin >> t;
		if(mp[t]){
			cout << (cnt%2==0?"Opened by ":"Closed by ") << t << endl;
			cnt++;
		}
		else cout << "Unknown " << t << endl;
	}
	return 0;
}

C++: #include<bits/stdc++.h>
#define rep(i,n)for(int i=0;i<n;i++)
using namespace std;

int main() {
	int n; scanf("%d", &n);
	vector<string>v;
	rep(i, n) {
		string s; cin >> s;
		v.push_back(s);
	}
	int m; scanf("%d", &m);
	bool b = false;
	rep(i, m) {
		string s; cin >> s;
		if (find(v.begin(), v.end(), s) == v.end())
			cout << "Unknown " << s << endl;
		else {
			if (b)cout << "Closed by " << s << endl;
			else cout << "Opened by " << s << endl;
			b = !b;
		}
	}
}

C++: #include <iostream>
#include <string>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
#include <vector>
#include <cmath>
#include <cctype>
#define rep(i,a,b) for(int i=(a);i<b;i++)
#define INF 1000000000
using namespace std;
bool debug=false;

int main(){
  int n,m;
  map<string,int> mp;
  cin>>n;
  rep(i,0,n){
    string s;
    cin>>s;
    mp[s]=1;
  }
  cin>>m;
  int cnt=0;
  rep(i,0,m){
    string s;
    cin>>s;
    if(mp[s]&&cnt%2==0){
      cout<<"Opened by "<<s<<endl;
      cnt++;
    }else if(mp[s]!=0&&cnt%2==1){
      cout<<"Closed by "<<s<<endl;
      cnt++;
    }else{
      cout<<"Unknown "<<s<<endl;
    }
  }
  return 0;
}

C++: n = int(input())
xs = []
for i in range(n): xs.append(input())
m = int(input())
flag = 1
for i in range(m):
    s = input()
    if s in xs:
        print("Opened" if flag == 1 else "Closed", "by", s)
        flag ^= 1
    else:
        print("Unknown", s)

C++: #include<iostream>
using namespace std;
int main(){
  string u[256],t;
  int n,m,i,j,f=0,k;
  cin>>n;
  for(i=0;i<n;i++)cin>>u[i];
  cin>>m;
  for(i=0;i<m;i++){
    cin>>t;
    k=f;
    for(j=0;j<n;j++)if(t==u[j]){
	if(f==0)f=1,cout<<"Opened by "<<t<<endl;
	else f=0,cout<<"Closed by "<<t<<endl;
      }
    if(k==f)cout<<"Unknown "<<t<<endl;
  }
  return 0;
}

C++: #include<iostream>
#include<string>
using namespace std;
int main(){
	int n,m;
	bool l=0,flg=0;
	cin>>n;
	string str[n],s;
	for(int i=0;i<n;i++) cin>>str[i];
	cin>>m;
	for(int i=0;i<m;i++){
		flg=0;
		cin>>s;
		for(int j=0;j<n;j++){
			if(s==str[j]){
				flg=1;
				if(l){
					cout<<"Closed by "<<s<<endl;
					l=0;
				}else{
					cout<<"Opened by "<<s<<endl;
					l=1;
				}
				break;
			}
		}
		if(flg==0) cout<<"Unknown "<<s<<endl;
	}
	return 0;
}