Submission #1141343

#	Time	Username	Problem	Language	Result	Execution time	Memory
1141343		Aliyyiakbar	Commuter Pass (JOI18_commuter_pass)	C++20	0 / 100	142 ms	22620 KiB

commuter_pass

/*
#ifndef ONLINE_JUDGE
#include "AkbarKING.h"
#else
#define debug(...)
#define debugArr(...)
#define debugG(...)
#endif
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define int long long
#define $AzH_TxdmN$ ios_base::sync_with_stdio(0);cin.tie(nullptr);cout.tie(nullptr);
#pragma GCC target("sse,sse2,sse3,ssse3,popcnt,abm,mmx,tune=native")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("no-stack-protector")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("fast-math")

#define ep emplace_back
#define pb push_back
#define pii pair<int,int>
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()

#define heap pii, vector<pii>, greater<pii>
using namespace std;
using namespace __gnu_pbds;

template <typename T>
using __indexed_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <typename T>
using __indexed_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;

mt19937 rng(chrono::steady_clock().now().time_since_epoch().count());

const int sz = 3e5+9;
const int LOG = 63;
const int MOD = 1e9+7;
const int INF = 1e18;
bool sdp[sz];
int dp[2][sz];
vector<pii>v[sz];

int n, m;
array<int, 2> start;
array<int, 2> endd;

int run = 0;
void djk(int x)
{
    ++run; // Run dijkstra on each consecutive start[i] for each 0 <= i < 3
    priority_queue<heap> pq;
    for (int i = 0; i <= n; ++i)
    {
        dp[0][i] = INF;
        dp[1][i] = -1;
    }
    dp[0][x] = 0;
    pq.emplace(dp[0][x], x);
    while(!pq.empty())
    {
        int w = pq.top().first;
        int node = pq.top().second;
        pq.pop();
        /*
        if (w == dp[0][node])
        {
            continue;
        }
        */
        for (auto to : v[node])
        {
            if (sdp[to.first] && dp[0][to.first] > dp[0][node])
            {
                dp[0][to.first] = dp[0][node];
                pq.emplace(dp[0][to.first], to.first);
                dp[1][to.first] = node;
            }
            else if (dp[0][to.first] > dp[0][node] + to.second)
            {
                dp[0][to.first] = dp[0][node] + to.second;
                pq.emplace(dp[0][to.first], to.first);
                dp[1][to.first] = node;
            }
        }
    }
    if (run & 1)
    {
        int lst = endd[0];
        while(lst != start[0] && lst != -1)
        {
            sdp[lst] = 1;
            lst = dp[1][lst];
        }
        sdp[start[0]] = 1;
    }
}

void solve()
{
    cin >> n >> m >> start[0] >> endd[0] >> start[1] >> endd[1];
    for (int i = 0, x, y, z; i < m; ++i)
    {
        cin >> x >> y >> z;
        v[x].ep(y, z);
        v[y].ep(x, z);
    }
    djk(start[0]);
    djk(start[1]);
    cout << dp[0][endd[1]] << '\n';
}

signed main()
{
    $AzH_TxdmN$
    int t = 1;
    // cin >> t;
    while (t--)
    {
        solve();
    }
}

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