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 <bits/stdc++.h>
using namespace std;
int main() {
int n,k;
cin >> n >> k;
int a[n],b[n];
for (int i = 0; i < n; i++) {
cin >> a[i] >> b[i];
}
sort(a,a+n);
double h = 0.00;
for (int i = 0; i < k; i++) {
h += a[i];
}
cout << h << endl;
}
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