#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<ll,ll>
#define F first
#define S second
const int N=1e5+10,off=(1<<17);
int n,k,a[N],dp[N][2];
vector<pii>v;
multiset<int>s;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cin>>n>>k;
for(int i=0;i<n;i++)cin>>a[i];
for(int i=0;i<n;i++){
if(i==0)dp[i][0]=a[i];
else dp[i][0]=max(dp[i-1][0],a[i]);
}
for(int j=1;j<k;j++){
//cout<<"------------------\n";
v.clear();
v.push_back({dp[j-1][0],0});
s.clear();
s.insert(dp[j-1][0]);
for(int i=j;i<n;i++){
//cout<<i<<'\n';
int zd=-1;
while(!v.empty() and v.back().S<a[i]){
//cout<<"v sz: "<<v.size()<<'\n';
pii nxt=v.back();
v.pop_back();
zd=nxt.F;
s.erase(s.find(nxt.F+nxt.S));
}
if(zd!=-1){
v.push_back({zd,a[i]});
s.insert(zd+a[i]);
}
dp[i][1]=(*s.begin());
v.push_back({dp[i][1],0});
s.insert(dp[i][1]);
}
for(int i=0;i<n;i++)dp[i][0]=dp[i][1];
}
cout<<dp[n-1][0];
return 0;
}
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