func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int t;     cin >> t;     while (t--) {       int n, k;       cin >> n >> k;       int arr[n], brr[n];       for (int i = 0; i < n; i++) {         cin >> arr[i];       }       sort(arr, arr + n, greater<int>());       for (int j = 0; j < n; j++) {         cin >> brr[j];       }       sort(brr, brr + n, greater<int>());       int ans = 0;       int i = 0, j = 0;       int cnt = n;       while (cnt--) {         if (arr[i] >= brr[j])           ans += arr[i], i += 1;         else if (k > 0)           ans += brr[j], j += 1, k -= 1;         else           ans += arr[i], i += 1;       }       cout << ans << endl;     }     return 0;   }   