func_code_string: #include <bits/stdc++.h>   using namespace std;   int main(void) {     int n, k, count, x, y, sum;     cin >> n >> k;     count = 2;     x = (n - 1) / k;     y = (n - 1) % k;     if (y == 0) {       sum = 2 * x;     } else if (y == 1) {       sum = 2 * x + 1;     } else {       sum = 2 * (x + 1);     }     cout << sum << endl;     for (int i = 0; i < k; i++) {       cout << 1 <<     << count << endl;       count++;     }     while (count <= n) {       cout << count - k <<     << count << endl;       count++;     }   }   