func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 200005;   int n, k, a[N], ans = 0;   multiset<int> ms;   int main(int argc, char const *argv[]) {     cin >> n >> k;     for (int i = 1; i <= n; ++i) {       cin >> a[i];       if (!a[i] && i != k) a[i] = n + 1;       if (i == k && a[i]) a[i] = 0, ans = 1;       ms.insert(a[i]);     }     int mex = 0;     while (!ms.empty()) {       if (ms.find(mex) == ms.end()) {         int k = *ms.rbegin();         ms.erase(ms.find(k));         ans++;       } else {         ms.erase(mex);       }       mex++;     }     cout << ans <<   n ;     return 0;   }   