func_code_string: #include <bits/stdc++.h>   using namespace std;   map<long long, long long>::iterator itr;   void c_p_c() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);   }   int32_t main() {     c_p_c();     long long t;     cin >> t;     while (t--) {       long long num, k;       cin >> num >> k;       vector<long long> v;       vector<long long> v1;       for (long long i = 0; i < num; i++) {         long long x;         cin >> x;         v.push_back(x);       }       for (long long i = 0; i < num; i++) {         long long x;         cin >> x;         v1.push_back(x);       }       sort(v.begin(), v.end());       sort(v1.begin(), v1.end(), greater<long long>());       long long sum = 0;       for (long long i = 0; i < k; i++) {         if (v1[i] > v[i])           sum += v1[i];         else           sum += v[i];       }       for (long long i = k; i < num; i++) {         sum += v[i];       }       cout << sum << endl;     }   }   