Submission #1870193

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Source Code Expand

#include <iostream>
#include <algorithm>
#define llint long long 

using namespace std;

llint N, K;
llint A[100005];

int main(void)
{
	cin >> N >> K;
	for(int i = 0; i < N; i++) cin >> A[i];
	sort(A, A+N);
	
	llint ans = 0;
	for(int i = 0; i < K; i++) ans += A[i];
	
	ans += K*(K-1)/2;
	cout << ans << endl;
	return 0;
}

Submission Info

Judge Result