Submission #958323

#	Time	Username	Problem	Language	Result	Execution time	Memory
958323		riariti	Palembang Bridges (APIO15_bridge)	C++17	31 / 100	2044 ms	7888 KiB

bridge

#line 1 "Palembang_Bridges.cpp"
#include <bits/stdc++.h>

#ifdef local
#define dbg(__VA_ARGS__)                                                       \
    std::cerr << "[DBG|" << __LINE__ << "]: " << __VA_ARGS__ << std::endl;
#define cerr(__VA_ARGS__) std::cerr << __VA_ARGS__;
#else
#define dbg(...)
#define cerr(...)
#endif

void vec_out(const std::vector<int> &cc) {
    dbg("vector: ");
    for (auto x : cc) {
        cerr(x << " ");
    }
    cerr("\n");
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int K, N;
    std::cin >> K >> N;
    std::vector<std::tuple<char, std::int64_t, char, std::int64_t>> PSQT(N);
    for (auto &[P, S, Q, T] : PSQT) {
        std::cin >> P >> S >> Q >> T;
    }

    std::int64_t ans = 0;
    std::vector<std::pair<std::int64_t, std::int64_t>> HW;
    for (auto [P, S, Q, T] : PSQT) {
        if (P == Q) {
            ans += std::abs(T - S);
            continue;
        }

        HW.emplace_back(S, T);
    }

    auto calc = [&](int S, int T, int x) {
        return std::abs(S - x) + std::abs(T - x) + 1;
    };

    if (K == 1) {
        auto f = [&](int x) {
            std::int64_t ans = 0;
            for (auto [S, T] : HW) {
                ans += calc(S, T, x);
            }

            return ans;
        };

        std::int64_t l = 0, r = 1'000'000'001;
        while (l <= r) {
            auto m = l + (r - l) / 2;

            if (f(m) <= f(m + 1)) {
                r = m - 1;
            } else {
                l = m + 1;
            }
        }

        ans += f(l);

        std::cout << ans << "\n";

        return 0;
    }

    std::set<int> st;
    for (auto [P, S, Q, T] : PSQT) {
        st.insert(S);
        st.insert(T);
    }

    std::int64_t tan = LLONG_MAX;
    for (auto i : st) {
        for (auto j : st) {
            if (i == j) {
                continue;
            }

            std::int64_t res = 0;
            for (auto [H, W] : HW) {
                res += std::min(calc(H, W, i), calc(H, W, j));
            }

            tan = std::min(tan, res);
        }
    }

    ans += tan;

    std::cout << ans << "\n";

    return 0;
}

Compilation message (stderr)

Palembang_Bridges.cpp: In function 'void vec_out(const std::vector<int>&)':
Palembang_Bridges.cpp:14:15: warning: unused variable 'x' [-Wunused-variable]

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 9 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37