func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k;     cin >> n >> k;     string s;     cin >> s;     int i = 0, j = 0;     int freq[2] = {0, 0};     int ans = 0;     bool over = 0;     while (j < n) {       while (min(freq[0], freq[1]) <= k && j < n) {         freq[s[j] -  a ]++;         if (min(freq[0], freq[1]) > k) {           over = true;           break;         }         j++;       }       ans = max(ans, j - i);       if (over) {         while (min(freq[0], freq[1]) > k) {           freq[s[i] -  a ]--;           i++;         }         over = 0;         j++;       }     }     cout << ans;   }   