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OI-codes/S2OJ/15/15.cpp

25 lines
514 B
C++

#include <bits/stdc++.h>
using namespace std;
int n, k, a;
long long sum[5000005], f[5000005], now = INT_MIN;
int main() {
std::ios::sync_with_stdio(false);
cin >> n >> k;
for (int i = 1; i <= n; ++i) {
cin >> a;
sum[i] = sum[i - 1] + a;
}
for (int i = 1; i <= n; ++i) {
f[i] = f[i - 1];
if (i - k >= 0) {
now = max(now, f[i - k] - sum[i - k]);
f[i] = max(f[i], now + sum[i]);
}
}
cout << f[n] << endl;
return 0;
}