Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
)

type Scanner struct {
	sc *bufio.Scanner
}

func NewScanner() *Scanner {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	return &Scanner{sc}
}

func (sc *Scanner) NextInt() int {
	sc.sc.Scan()
	i, err := strconv.Atoi(sc.sc.Text())
	if err != nil {
		panic(err)
	}
	return i
}

func main() {
	sc := NewScanner()

	n := sc.NextInt()
	m := sc.NextInt()

	mp := map[int]int{}
	for i := 0; i < n; i++ {
		mp[sc.NextInt()]++
	}
	for i := 0; i < m; i++ {
		mp[sc.NextInt()]++
	}
	var and, or []int
	for k, v := range mp {
		if v >= 1 {
			or = append(or, k)
		}
		if v == 2 {
			and = append(and, k)
		}
	}
	sort.Ints(and)
	sort.Ints(or)
	fmt.Println(len(and), len(or))
	for _, v := range and {
		fmt.Println(v)
	}
	for _, v := range or {
		fmt.Println(v)
	}
}

C++: #include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <bitset>
#include <map>
#include <tuple>
#include <unordered_set>
#include <unordered_map>
#include <list>
#include <numeric>
#include <utility>
#include <iterator>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <climits>
#include <ctime>
#include <cassert>
#include <random>
#include <cstring>


#define rep(i,n) for(int i=0;i<int(n);i++)
#define all(x) (x).begin(),x.end()
#define pb push_back

using namespace std;
using ll = long long;

const ll mod = 1000000007;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
int ddx[8]={-1,-1,0,1,1,1,0,-1};
int ddy[8]={0,1,1,1,0,-1,-1,-1};
bool debug=false;

/*---------------------------------------------------*/

int main(){
  map<ll, int> mp;
  ll N, M, a, b;
  cin >> N >> M;
  for(int i = 0; i < N; i++) {
    cin >> a;
    mp[a]++;
  }
  for(int i = 0; i < M; i++) {
    cin >> b;
    mp[b]++;
  }

  int and_cnt = 0, or_cnt = 0;
  for(auto itr : mp){
    or_cnt++;
    if(mp[itr.first] == 2) and_cnt++;
  }
  cout << and_cnt << " " << or_cnt << endl;

  for(auto itr : mp){
    if(itr.second == 2) cout << itr.first << endl;
  }
  for(auto itr : mp){
    cout << itr.first << endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>

using namespace std;

#define ALL(x) (x).begin(), (x).end()
#define AND(x,y,z) 
#define DUMP(xs) for (auto x:xs) cout<<x<<' ';cout<<endl
#define DUMPP(xs) for (auto x:xs) cout<<'('<<x.first<<','<<x.second<<')';cout<<endl
#define FOR(i,a,b) for (ll i=(ll)(a);i<(ll)(b);++i)
#define OUT(x) cout<<x<<endl
#define REP(i,n) FOR(i,0,n)
#define YES(cond) cond ? OUT("YES") : OUT("NO")
#define Yes(cond) cond ? OUT("Yes") : OUT("No")

template<class T> T gcd(const T x,const T y){if(!y){return x;}return gcd(y,x%y);}
template<class T> T lcm(const T x,const T y){return x/gcd(x,y)*y;};
template<class T> T modpow(const T x,const T n,const T mod) {
  T res=1;while(n>0){if(n%2)res=res*x%mod;x=x*x%mod;n/=2;};return res;
}
template<class T> bool alltrue(const T &a){return all_of(ALL(a),[](bool x){return x;});}
template<class T> bool anytrue(const T &a){return any_of(ALL(a),[](bool x){return x;});}
template<class T> bool contain(const T &a,const T &b){for(auto x:b){if (a.find(x)==a.end()){return false;}}return true;}
template<class T> bool mmax(T &m,const T q){ if (m < q) {m = q; return true;} else return false; }
template<class T> bool mmin(T &m,const T q){ if (m > q) {m = q; return true;} else return false; }
template<class T> int siz(const T &a) {return (int)a.size();}
template<class T> set<T> devisers(T n) {
  set<T> res;for(T i=1;i<(T)sqrt(n)+1;i++){if(n%i==0){res.insert(i);res.insert(n/i);}}return res;
}
template<class T> void concat(T &a, const T &b){a.insert(a.end(),b.begin(),b.end());}
template<class T> void getand(const T &a,const T &b,T &c) {
  set_intersection(a.begin(),a.end(),b.begin(),b.end(),inserter(c,c.end()));
}
template<class T> void getor(const T &a,const T &b,T &c) {
  set_union(a.begin(),a.end(),b.begin(),b.end(),inserter(c,c.end()));
}

typedef long long ll;
typedef pair<ll, ll> P;

const ll MOD=1e9+7;
const int MAX=1e5+100;

int main() {
  int n,m;cin>>n>>m;
  set<int> as,bs;
  REP(i,n) {
    int a;cin>>a;
    as.insert(a);
  }
  REP(i,m) {
    int b;cin>>b;
    bs.insert(b);
  }
  set<int> cs,ds;
  getand(as,bs,cs);
  getor(as,bs,ds);
  // DUMP(cs);
  // DUMP(ds);
  cout << siz(cs)<<' '<<siz(ds)<<endl;
  for (int c:cs) OUT(c);
  for (int d:ds) OUT(d);
  // DUMP(getor(as,bs,cs));

  return 0;
}

C++: //↓template↓

#include "bits/stdc++.h"
using namespace std;
#define Would
#define you
#define all(n)  n.begin(),n.end()
const long long INF = 1e18;
const long long MOD = 1e9 + 7;
const double pi = acos(-1);
const int SIZE = 1 << 17;
int dx[] = { 1,0 }, dy[] = { 0,1 }, alp[30];
long long fac[200005], finv[200005], inv[200005];
vector<long long>dij;
struct edge { long long to, cost; };
vector<vector<edge> >G;

long long mod_pow(long long a, long long b) {
	long long res = 1, mul = a;
	for (int i = 0; i < 31; ++i) {
		if (b >> i & 1) {
			res *= mul;
			res %= MOD;
		}
		mul = (mul * mul) % MOD;
	}

	return res;
}

void addedge(int from, int to, int cost) {
	G[from].push_back({ to,cost });
	G[to].push_back({ from,cost });
}

//↑template↑


long long a, b, k[200005], l[200005], mon;
queue<long long>ans;
set<long long>s;
int main() {
	cin >> a >> b;
	for (int i = 0; i < a; ++i) {
		cin >> k[i];
		s.insert(k[i]);
	}

	for (int i = 0; i < b; ++i) {
		cin >> l[i];
		s.insert(l[i]);
	}

	for (int i = 0; i < a; ++i) {
		while (mon < b&&l[mon] < k[i]) { ++mon; }
		if (mon == b) { break; }
		if (l[mon] == k[i]) {
			ans.push(k[i]);
			++mon;
		}
	}

	cout << ans.size() << " " << s.size() << endl;

	while (!ans.empty()) {
		cout << ans.front() << endl;
		ans.pop();
	}
	while (!s.empty()) {
		auto itr = s.begin();
		cout << *itr << endl;
		s.erase(s.begin());
	}
}

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

int main(void){
	int n, m;
	cin >> n >> m;
	vector<int> a(n);
	vector<int> b(m);
	vector<int> ans_and;
	vector<int> ans_or;
	for(int i = 0; i < n; ++i){
		cin >> a[i];
	}
	for(int i = 0; i < m; ++i){
		cin >> b[i];
	}
	int num_a = 0, num_o = 0;
	int i = 0, j = 0;
	while(true){
		if(a[i] == b[j]){
			ans_and.push_back(a[i]);
			ans_or.push_back(a[i]);
			i++; j++;
		}else if(a[i] > b[j]){
			ans_or.push_back(b[j]);
			j++;
		}else{
			ans_or.push_back(a[i]);
			i++;
		}
		if(i == n || j == m) {break;}
	}
	while(i != n){ ans_or.push_back(a[i]); i++;}
	while(j != m){ ans_or.push_back(b[j]); j++;}
	cout << ans_and.size() << " " << ans_or.size() << endl;
	for(auto x : ans_and) cout << x << endl;
	for(auto x : ans_or) cout << x << endl;
	return 0;
}

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

int main() {
    int n, m;
    cin >> n >> m;
    set<int> OR;
    set<int> AND;
    set<int> a;
    set<int> b;
    for(int i = 1; i <= n; i++) {
        int in;
        cin >> in;
        a.insert(in);
        OR.insert(in);
    }
    for(int i = 1; i <= m; i++) {
        int in;
        cin >> in;
        OR.insert(in);
        if(a.find(in) != a.end()) AND.insert(in);
    }
    cout << AND.size() << " " << OR.size() << endl;
    for(auto itr = AND.begin(); itr != AND.end(); itr++) {
        cout << *itr << endl;
    }
    for(auto itr = OR.begin(); itr != OR.end(); itr++) {
        cout << *itr << endl;
    }
    return 0;
}