func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     int N, M;     int64_t K;     cin >> N >> M >> K;     vector<int> A(N);     for (int i = 0; i < N; i++) cin >> A[i];     int64_t ret = 0;     for (int m = 0; m < M; m++) {       vector<int64_t> B(N);       for (int i = 0; i < N; i++) {         B[i] = A[i];         if (i % M == m) B[i] -= K;       }       if (!(m < N)) continue;       int64_t x = B[m];       int64_t best = x;       for (int i = m + 1; i < N; i++) {         if (i % M == m && x < 0)           x = B[i];         else           x += B[i];         best = max(x, best);       }       ret = max(best, ret);     }     cout << ret << endl;     return 0;   }   