This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
# include <bits/stdc++.h>
# define speed ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
# define int long long
# define fi first
# define se second
using namespace std;
const int N = 1e7 + 7;
const int mod = 1e9 + 7;
int a[N], dp[N][2];
int32_t main() {
speed;
int n, k;
cin >> n >> k;
for ( int i = 1; i <= n; i++ ) {
cin >> a[i];
}
int sum = 0;
for ( int i = 1; i < k; i++ ) {
sum += a[i];
}
for ( int i = k; i <= n; i++ ) {
a[i] += sum;
}
int mx = 0;
for ( int i = k; i <= n; i++ ) {
mx = max( mx, a[i] );
}
cout << mx;
}
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