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OI-codes/Codeforces/13/C/C.cpp

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#include <iostream>
#include <queue>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1e6 + 5;
int n;
long long ans;
std::priority_queue<long long> q;
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n;
for (int i = 1, x; i <= n; i++) {
cin >> x;
q.emplace(x);
if (x < q.top()) {
ans += q.top() - x;
q.pop();
q.emplace(x);
}
}
cout << ans << endl;
return 0;
}