Submission #958197

#	Time	Username	Problem	Language	Result	Execution time	Memory
958197		riariti	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	1 ms	456 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

const auto 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, int, char, int>> PSQT(N);
    for (auto &[P, S, Q, T] : PSQT) {
        std::cin >> P >> S >> Q >> T;
    }

    // std::vector<int> cc;
    // for (auto [P, S, Q, T] : PSQT) {
    //     cc.push_back(S);
    //     cc.push_back(T);
    // }

    // std::ranges::sort(cc);
    // cc.erase(std::unique(cc.begin(), cc.end()), cc.end());

    // vec_out(cc);

    // auto compress = [cc](int v) {
    //     return std::distance(cc.begin(), std::ranges::lower_bound(cc, v));
    // };
    // auto expand = [cc](int v) { return cc[v]; };

    // for (auto &[P, S, Q, T] : PSQT) {
    //     S = compress(S);
    //     T = compress(T);
    // }

    // dbg("Compressed here");
    // for (auto [P, S, Q, T] : PSQT) {
    //     dbg(P << " " << S << " " << Q << " " << T);
    // }

    // median => at max 4 possibilites, then sliding window all throughout
    // optimal to keep one of the points at someones house or office tho

    std::vector<int> pos;
    for (auto [P, S, Q, T] : PSQT) {
        pos.push_back(S);
        pos.push_back(T);
    }
    vec_out(pos);

    // K = 1 minimized at median since sum is as follows:
    //
    // sum of all |Si - x| + |Ti - x|

    auto m = pos.size() / 2;
    std::nth_element(pos.begin(), pos.begin() + m, pos.end());
    vec_out(pos);

    auto med = pos[m];

    std::int64_t ans = 0;
    for (auto [P, S, Q, T] : PSQT) {
        ans += static_cast<std::int64_t>(std::abs(S - med)) + std::abs(T - med);
    }

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

    return 0;
}

Compilation message (stderr)

Palembang_Bridges.cpp: In lambda function:
Palembang_Bridges.cpp:14:15: warning: unused variable 'x' [-Wunused-variable]

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