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;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int n, k;
cin>>n>>k;
int last;
vector<int>v;
for(int i=1;i<=n;i++){
int t;
cin>>t;
if(i>1){
v.push_back(t-last-1);
}
last=t;
}
sort(v.begin(), v.end());
int ans=n;
for(int i=0;i<n-k;i++){
ans+=v[i];
}
cout<<ans;
}
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