func_code_string: #include <bits/stdc++.h>   using namespace std;   long int temp, i, j, k, T;   int main() {     int n, a, b;     cin >> n >> a >> b;     int h[2007];     for (i = 0; i < n; i++) cin >> h[i];     sort(h, h + n);     int val = h[b - 1];     if (h[b] == val)       cout <<  0  << endl;     else       cout << h[b] - val << endl;     return 0;   }   