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>
using namespace std;
#define int long long
int n,k;
vector<int> v;
int mn,mx;
signed main()
{
cin >> n >> k;
int prev=0;
for (int i=0;i<n;i++)
{
int x;
cin >> x;
if (i==0) mn=x;
if (i==n-1) mx=x+1;
if (i<0) v.push_back(x-prev-1);
prev=x;
}
sort(v.begin(),v.end(),greater<int>());
int res=mx-mn;
for (int i=0;i<k-1;i++)
{
res-=v[i];
}
cout << res;
}
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