# Untitled

Sep 18th, 2023
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1.  #include <bits/stdc++.h>
2.
3.  #define ll long long
4.  #define ull unsigned long long
5.  #define pi 3.141592654
6.  #define NUM 1e18
7.  #define Mod  1'000'000'007
8.  #define fixed(n) fixed<<setprecision(n)
9.  #define cin(v) for(auto &i:v) cin >> i ;
10.  #define cout(v) for(auto &i:v) cout << i  <<" ";
11.  #define vowel(x) (x=='e'||x=='a'||x=='i'||x=='o'||x=='u')
12.  #define small(x) (x>=97&&x<=122)
13.  #define capital(x) (x>=65&&x<=90)
14.  #define Tolower(s) transform(s.begin(),s.end(),s.begin(),::tolower);
15.  #define Toupper(s) transform(s.begin(),s.end(),s.begin(),::toupper);
16.  #define all(v) ((v).begin()), ((v).end())
17.  #define allr(v) ((v).rbegin()), ((v).rend())
18.  #define updmax(a,b) a=max(a,b)
19.  #define updmin(a,b) a=min(a,b)
20.  #define ceil(a,b) ((a/b)+(a%b?1:0))
21.  /* asc -> 1 2 3 ,des -> 3 2 1 */
22.
23.  /***********************************************************************************/
24.
25.  using namespace std;
26.
28.   #ifndef ONLINE_JUDGE
29.     freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
30.    #endif
31.     ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
32.  }
33.
34.
35.  void solve(){
36.   int n,counter=0,maxi=INT_MIN;
37.   cin>>n;
38.   vector<int>v(2*n);
39.   cin(v);
40.   int freq[100001]{};
41.   for(int i=0;i<2*n;i++){
42.     freq[v[i]]++;
43.     if(freq[v[i]]==1){
44.       counter++;
45.     }else if(freq[v[i]]>1){
46.       freq[v[i]]--;
47.       counter--;
48.     }
49.     maxi=max(maxi,counter);
50.   }cout<<maxi<<"\n";
51.  }
52.
53.
54.  int main(){