func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k;     cin >> n >> k;     int a[n], e = 0, s = 0;     for (int i = 0; i < n; i++) {       cin >> a[i];       if (a[i] == 1)         e++;       else         s++;     }     int ans = 0;     for (int b = 0; b < k; b++) {       int c = b, ee = e, second = s;       while (c < n) {         if (a[c] == 1)           ee--;         else           second--;         c += k;       }       ans = max(ans, abs(ee - second));     }     cout << ans;   }   