func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m, x, y;     cin >> n >> m;     pair<int, pair<int, int> > arr[n];     int arr1[n], arr2[n];     for (int i = 0; i < n; ++i) cin >> arr1[i];     for (int i = 0; i < n; ++i) cin >> arr2[i];     for (int i = 0; i < n; ++i) {       arr[i].second.first = arr1[i];       arr[i].second.second = arr2[i];       arr[i].first = arr[i].second.first - arr[i].second.second;     }     sort(arr, arr + n);     long long sum = 0;     if (n == m) {       for (int i = 0; i < n; ++i) sum += arr[i].second.first;       cout << sum << endl;       return 0;     }     for (int i = 0; i < n; ++i) {       if (m > 0) {         sum += arr[i].second.first;         --m;       } else {         if (arr[i].second.first > arr[i].second.second)           sum += arr[i].second.second;         else           sum += arr[i].second.first;       }     }     cout << sum << endl;     return 0;   }   