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<queue>
using namespace std;
priority_queue<int> kolejka;
int t[1000000];
int main()
{
cin.tie(0);
cout.tie(0);
ios_base::sync_with_stdio(0);
int n,k;
cin>>n>>k;
for(int i=1;i<=n;i++)
cin>>t[i];
int wynik=t[n]-t[1]+1;
k--;
for(int i=1;i<n;i++)
kolejka.push(t[i+1]-t[i]-1);
for(int i=1;i<=k;i++)
{
int mam=kolejka.top();
wynik-=mam;
kolejka.pop();
}
cout<<wynik;
return 0;
}
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