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31 lines
770 B
C++
31 lines
770 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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int main()
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{
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ios::sync_with_stdio(false);
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int n, k;
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cin >> n >> k;
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vector<pair<int64_t, int64_t>> v(n);
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for (auto &p : v) cin >> p.second >> p.first;
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sort(begin(v), end(v));
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reverse(begin(v), end(v));
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long long res = 0, sum = 0;
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multiset<int64_t> s;
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for (int i = 0; i < n; i++)
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{
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s.insert(v[i].second);
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sum += v[i].second;
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while (s.size() > k)
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{
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auto it = s.begin();
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sum -= *it;
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s.erase(s.begin());
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}
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res = max(res, sum * v[i].first);
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}
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cout << res << endl;
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return 0;
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}
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