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;
using ll = long long;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
vector<pair<int, int>> a(n);
for(auto& i : a) {
cin >> i.first >> i.second;
i.second /= 2;
}
a.push_back({0, 0});
sort(a.begin(), a.end(), [&](const auto& i, const auto& j) {
return i.second > j.second;
});
ll ans = 0;
int mx = 0;
for(int i = 0; i < (int) a.size()-1; i++) {
mx = max(mx, a[i].first);
ans += (a[i].second - (a[i+1].second)) * mx;
}
ans *= 2;
cout << ans << "\n";
return 0;
}
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