func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     int n, k;     cin >> n >> k;     vector<int> a(n), b(n);     for (int i = 0; i < n; ++i) cin >> a[i];     for (int i = 0; i < n; ++i) cin >> b[i];     long long ans = 0;     for (int i = 0; i < n; ++i)       if (b[i] == 1) {         ans += a[i];         a[i] = 0;       }     long long temp = 0, max = 0;     for (int i = 0; i < k; ++i) {       temp += a[i];     }     ans += temp;     max = temp;     for (int i = 1; i <= n - k; ++i) {       temp += (a[i + k - 1] - a[i - 1]);       if (max < temp) {         ans -= max;         max = temp;         ans += max;       }     }     cout << ans <<   n ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int t = 1;     for (int i = 1; i <= t; ++i) {       solve();     }   }   