WHY????????????

我哪儿错了？WHY？？？？？？？？？？？？？
为什么？？？？？？？？？？？？？？？？？？

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int main() {
int n, K;
cin >> n >> K;
vector<ll> A(n);
for (int i = 0; i < n; ++i) {
cin >> A[i];
}
sort(A.begin(), A.end());

priority_queue<ll, vector<ll>, greater<ll>> pq;
for (int i = 1; i < n; ++i) {
    pq.push(A[i] - A[i-1]);
}

ll res = 0;
int days_used = 0;
while (days_used < K && !pq.empty()) {
    res += pq.top();
    pq.pop();
    days_used++;
}
cout << res << endl;
return 0;

}