Submission #939226

#	Time	Username	Problem	Language	Result	Execution time	Memory
939226		vjudge1	Commuter Pass (JOI18_commuter_pass)	C++17	0 / 100	73 ms	19796 KiB

commuter_pass

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #include <x86intrin.h>

#include <bits/stdc++.h>
#include <chrono>
#include <random>

// @author: Vlapos

namespace operators
{
    template <typename T1, typename T2>
    std::istream &operator>>(std::istream &in, std::pair<T1, T2> &x)
    {
        in >> x.first >> x.second;
        return in;
    }

    template <typename T1, typename T2>
    std::ostream &operator<<(std::ostream &out, std::pair<T1, T2> x)
    {
        out << x.first << " " << x.second;
        return out;
    }

    template <typename T1>
    std::istream &operator>>(std::istream &in, std::vector<T1> &x)
    {
        for (auto &i : x)
            in >> i;
        return in;
    }

    template <typename T1>
    std::ostream &operator<<(std::ostream &out, std::vector<T1> &x)
    {
        for (auto &i : x)
            out << i << " ";
        return out;
    }

    template <typename T1>
    std::ostream &operator<<(std::ostream &out, std::set<T1> &x)
    {
        for (auto &i : x)
            out << i << " ";
        return out;
    }
}

// name spaces
using namespace std;
using namespace operators;
// end of name spaces

// defines
#define ll long long
#define ull unsigned long long
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define f first
#define s second
#define uint unsigned int
#define all(vc) vc.begin(), vc.end()
// end of defines

// usefull stuff

void boost()
{
    ios_base ::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

inline int getbit(int &x, int &bt) { return (x >> bt) & 1; }

const int dx4[4] = {-1, 0, 0, 1};
const int dy4[4] = {0, -1, 1, 0};
const int dx8[8] = {-1, -1, -1, 0, 0, 1, 1, 1};
const int dy8[8] = {-1, -0, 1, -1, 1, -1, 0, 1};

const ll INF = (1e18) + 500;
const int BIG = (1e9) * 2 + 100;
const int MAXN = (1e5) + 5;
const int MOD7 = (1e9) + 7;
const int MOD9 = (1e9) + 9;
const uint MODFFT = 998244353;

#define int ll

struct test
{
    vector<vector<pii>> graph;
    int n, m;

    vector<int> countD(int st)
    {
        vector<int> dist(n, INF);
        dist[st] = 0;
        priority_queue<pii> q;
        q.push({0, 0});
        while (q.size())
        {
            auto [bf, v] = q.top();
            q.pop();
            if (-bf != dist[v])
                continue;
            for (auto [tov, c] : graph[v])
                if (dist[tov] > dist[v] + c)
                {
                    dist[tov] = dist[v] + c;
                    q.push({-dist[tov], tov});
                }
        }
        return dist;
    }

    void solve(int testcase)
    {
        boost();
        cin >> n >> m;
        graph.resize(n);
        int S, T, V1, V2;
        cin >> S >> T >> V1 >> V2;
        --S, --T, --V1, --V2;
        for (int i = 0; i < m; ++i)
        {
            int v, tov, c;
            cin >> v >> tov >> c;
            --v, --tov;
            graph[v].pb({tov, c});
            graph[tov].pb({v, c});
        }
        map<int, vector<int>> dist;
        dist[S] = countD(S);
        dist[T] = countD(S);
        dist[V1] = countD(S);
        dist[V2] = countD(S);

        int mn1 = INF, mn2 = INF;

        int D = dist[S][T];

        for (int i = 0; i < n; ++i)
            if (dist[S][i] + dist[T][i] == D)
            {
                mn1 = min(mn1, dist[V1][i]);
                mn2 = min(mn2, dist[V2][i]);
            }

        cout << mn1 + mn2 << "\n";
    }
};

main()
{
    boost();
    int q = 1;
    // cin >> q;
    for (int i = 0; i < q; i++)
    {
        test t;
        t.solve(i);
    }
    return 0;
}
//[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]//
//                                                                                    //
//                               Coded by Der_Vlἀpos                                  //
//                                                                                    //
//[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]//

Compilation message (stderr)

commuter_pass.cpp:159:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  159 | main()
      | ^~~~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45