func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1e6 + 10;   const int TMXN = 1e6 * 4 + 1;   const int INF = 1e9 + 7;   const long long INFL = 1e18;   int n, k;   char a[N];   int mink = INF;   int pref[N];   int main() {     cin >> n >> k;     for (int i = 1; i <= n; i++) {       cin >> a[i];       if (!(a[i] - 48)) {         pref[i] = pref[i - 1] + 1;       } else {         pref[i] = pref[i - 1];       }     }     for (int i = n + 1; i <= N; i++) {       pref[i] = pref[i - 1];     }     for (int i = 1; i <= n; i++) {       int l = 0;       int r = max(n - i, i - 1) + 1;       if (a[i] ==  0 ) {         while (r - l > 1) {           int mid = (r + l) / 2;           if (pref[i + mid] - pref[max(i - mid - 1, 0)] >= k + 1) {             r = mid;           } else {             l = mid;           }         }         if (pref[i + r] - pref[max(i - r - 1, 0)] >= k + 1) {           mink = min(mink, r);         }         if (pref[i + l] - pref[max(i - l - 1, 0)] >= k + 1) {           mink = min(mink, l);         }       }     }     cout << mink;     return 0;   }   