func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long INF = 1e18;   const long long MOD = 1e9 + 7;   const int N = 1e6;   int T, n, r, A[1005];   void solve() {     cin >> n >> r;     for (int i = 1; i <= n; i++) {       cin >> A[i];     }     int ans = 0;     int z;     for (int i = 1; i <= n; i = z + r) {       bool can_warm = false;       z = -1;       int left = max(i - r + 1, 0), right = min(i + r, n + 1);       for (int j = left; j < right; j++) {         if (A[j]) {           can_warm = true;           z = j;         }       }       if (!can_warm) {         cout << -1;         return;       }       ans++;     }     cout << ans;   }   int(main)() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     T = 1;     while (T--) {       solve();     }   }   