Submission #2546460

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Source Code Expand

#if !defined(__clang__) && defined(__GNUC__)
#include <bits/stdc++.h>
#else
#include <cstdlib>
#include <climits>
#include <iostream>
#include <cstdint>
#include <vector>
#include <string>
#include <complex>
#include <bitset>
#include <queue>
#include <deque>
#include <stack>
#include <utility>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <regex>
#endif //  !defined(__clang__) && defined(__GNUG__)
#include <boost/lexical_cast.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/multi_array.hpp>
#include <boost/optional.hpp>
#include <boost/math/common_factor_rt.hpp>

using namespace std;

int main()
{
    int64_t N, K;
    std::cin >> N >> K;

    struct P {
        int64_t a;
        int64_t b;
        int64_t c;
    };

    std::multimap<int64_t, P> m;
    for (int64_t i = 0; i < N; ++i) {
        P t;
        std::cin >> t.a >> t.b;
        t.c = 1;
        m.emplace(t.a, t);
    }


    int64_t time = 0;
    for (int64_t i = 0; i < K; ++i) {
        auto t = m.begin();
        time += t->first;
        t->second.c += 1;
        m.emplace(t->second.a + (t->second.c - 1) * t->second.b, t->second);
        m.erase(t);
    }

    std::cout << time << std::endl;

    return 0;
}

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