func_code_string: #include <bits/stdc++.h>   using namespace std;   bool comp(long long x, long long y) { return x > y; }   int dx[] = {0, 0, 1, -1, 1, 1, -1, -1};   int dy[] = {1, -1, 0, 0, -1, 1, 1, -1};   int n, k;   char s[100000 + 5];   int prefix[100000 + 5];   bool check(int x, int i) {     int tmp = prefix[min(n - 1, i + x)];     if (i - x > 0) tmp -= prefix[i - x - 1];     if (tmp >= k + 1) return true;     return false;   }   int main() {     cin >> n >> k;     cin >> s;     for (int i = 0; i < n; i++) {       if (i != 0) prefix[i] = prefix[i - 1];       prefix[i] += (s[i] ==  0 );     }     int res = 1e9;     for (int i = 0; i < n; i++) {       int ans = 1e9;       if (s[i] ==  0 ) {         int l = 0, r = 1e9;         while (l != r) {           int mid = (l + r - 1) / 2;           if (check(mid, i)) {             r = mid;             ans = min(ans, mid);           } else             l = mid + 1;         }         res = min(res, ans);       }     }     cout << res << endl;     return 0;   }   