This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// Patryk Niemczyk stov.cpp
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main()
{
ios_base::sync_with_stdio(0), cin.tie(0);
int n, k;
cin >> n >> k;
vector<int> odstepy(n - 1);
int ost;
cin >> ost;
for (int i = 1; i < n; ++i)
{
int akt;
cin >> akt;
odstepy[i - 1] = akt - ost - 1;
ost = akt;
}
sort(odstepy.begin(), odstepy.end());
auto it1 = lower_bound(odstepy.begin(), odstepy.end(), 0);
auto it2 = upper_bound(odstepy.begin(), odstepy.end(), 0);
int lzer = it2 - it1, wynik = n;
int doDobrania = n - lzer - k;
for (int i = lzer; i < lzer + doDobrania; ++i)
wynik += odstepy[i];
cout << wynik << '\n';
return 0;
}
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