func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     cin >> n >> m;     int a[n];     for (int i = 0; i < n; ++i) cin >> a[i];     m--;     int cnt = 0;     for (int i = 0; i < n; ++i)       if (1) {         bool ok = 0;         for (int j = i + m; j >= 0 && j >= i - m; --j)           if (j >= n)             continue;           else if (a[j] == 1) {             cnt++;             i = j + m;             ok = 1;             break;           }         if (!ok) return cout << -1, 0;       }     cout << cnt;     return 0;   }   