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 F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
#define int long long
#define ll long long
typedef unsigned long long ull;
using namespace std;
const int N=3e5+5;
int n,k,a[N],b[N];
bool ans[N];
int32_t main(){
	ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
	cin>>n>>k;
	for (int i=1;i<=n;i++) cin>>a[i];
	for (int i=1;i<=n;i++) cin>>b[i];
	int mx=LLONG_MIN;
	for (int i=1;i+k-1<=n;i++){
		multiset<int> s;
		int sum=0;
		for (int j=i;j<i+k;j++){
			s.ep(b[j]);
			sum-=a[j];
			sum+=b[j];
		}
		mx=max(mx,sum);
		for (int j=i+k;j<=n;j++){
			s.ep(b[j]);
			sum-=a[j];
			sum+=b[j];
			int x=*s.begin();
			s.erase(s.begin());
			sum-=x;
			mx=max(mx,sum);
		}
	}cout<<mx<<endl;
	return 0;
}
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