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 <iostream>
#include <cstdio>
#include <algorithm>
using namespace std;
#define endl '\n'
#define ll long long
#define pi pair<ll, ll>
#define f first
#define s second
const int mxn = 300001;
int n, k;
ll a[mxn];
pi dp[mxn];
pi sol(ll x){
pi p = dp[0];
for(int i = 1; i <= n; i++){
dp[i] = dp[i - 1];
if(p.f + a[i] - x >= dp[i].f) dp[i] = {p.f + a[i] - x, p.s + 1};
if(dp[i].f - a[i] >= p.f) p = {dp[i].f - a[i], dp[i].s};
}
return dp[n];
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> k;
for(int i = 1; i <= n; i++) cin >> a[i], a[i] += a[i - 1];
ll l = -1, r = 0x3f3f3f3f;
while(r - l > 1){
ll mid = (l + r) / 2;
if(sol(mid).s <= k) r = mid;
else l = mid;
}
pi p = sol(r);
cout << (p.f + p.s * r) << endl;
return 0;
}
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