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#include <bits/stdc++.h> using namespace std; typedef long long ll; int main() { ios_base::sync_with_stdio(false); int n, k, s; cin >> n >> k >> s; vector<int> v(n); for(int i = 0; i < n; i++) { cin >> v[i]; } ll sum = 0; for(int i = 0; i < k - 1; i++) { sum += v[i]; } int j = 0; vector<pair<ll, int>> max_sums; for(int i = k - 1; i < n; i++) { sum += v[i]; max_sums.push_back(make_pair(sum, j)); sum -= v[j]; j++; } sort(max_sums.rbegin(), max_sums.rend()); ll res = 0; int till = min((int) max_sums.size(), 7000); for(int i = 0; i < till; i++) { ll tmp_sum = 0; for(j = max_sums[i].second + s - 1; j <= max_sums[i].second + k - 1; j += s) { tmp_sum += v[j]; } res = max(res, max_sums[i].first - tmp_sum); } cout << res << endl; return 0; }
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