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- #include <bits/stdc++.h>
- #define int int64_t
- using namespace std;
- void relax(int& a, int b) {
- a = max(a, b);
- }
- int32_t main() {
- ios_base::sync_with_stdio(false);
- int n, k;
- cin >> n >> k;
- vector<int> a(n);
- for (int i = 1; i < n - 1; i++) {
- cin >> a[i];
- }
- vector<int> dp(n, -2e18);
- dp[0] = 0;
- for (int i = 1; i < n; i++) {
- for (int j = 1; j <= k && j <= i; j++) {
- relax(dp[i], dp[i - j] + a[i]);
- }
- }
- cout << dp[n - 1] << '\n';
- }
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