func_code_string: #include <bits/stdc++.h>   using namespace std;   long long mul(long long a, long long b) { return (a * b) % 1000000007; }   long long add(long long a, long long b) {     a += b;     if (a >= 1000000007) a -= 1000000007;     return a;   }   long long binary_expo(long long base, long long expo) {     long long res = 1;     while (expo) {       if (expo % 2) {         res = mul(res, base);       }       expo /= 2;       base = mul(base, base);     }     return res;   }   long long A[202];   void solve() {     long long n;     cin >> n;     for (long long i = 1; i <= 2 * n; i++) {       cin >> A[i];     }     long long ans = 0;     for (long long i = 1; i <= 2 * n; i += 2) {       long long index = -1;       for (long long j = i + 1; j <= 2 * n; j++) {         if (A[i] == A[j]) {           index = j;           break;         }       }       for (long long j = index - 1; j >= i + 1; j--) {         swap(A[j], A[j + 1]);         ans++;       }     }     cout << ans <<   n ;   }   signed main() {     long long t;     t = 1;     while (t--) {       solve();     }   }   