func_code_string: #include <bits/stdc++.h>   using namespace std;   const double eps = 1e-10;   const int inf = 0x3f3f3f3f, N = 2e5 + 10;   const double pi = acos(-1);   using namespace std;   char s[N];   int num[N];   int main() {     int n, k;     while (cin >> n >> k) {       scanf( %s , s + 1);       memset(num, 0, sizeof(num));       for (int i = 1; s[i]; i++) {         if (s[i] ==  0 )           num[i] = num[i - 1] + 1;         else           num[i] = num[i - 1];       }       int ans = inf;       int last = 0;       if (k == 1) {         for (int i = 1; i <= n; i++) {           if (!last && s[i] ==  0 )             last = i;           else if (last && s[i] ==  0 ) {             ans = i - last;             break;           }         }       }       for (int i = 1; i <= n; i++) {         if (s[i] ==  1 ) continue;         int l = 1, r = n;         while (l <= r) {           int mid = (l + r) >> 1;           int st = max(1, i - mid);           int en = min(n, i + mid);           if (num[en] - num[st - 1] >= k + 1)             r = mid - 1;           else             l = mid + 1;         }         ans = min(ans, l);       }       cout << ans << endl;     }     return 0;   }   