Submission #1012326

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012326		codefox	Robot (JOI21_ho_t4)	C++14	100 / 100	1222 ms	151624 KiB

Main

#include<bits/stdc++.h>
    
using namespace std;
    
#pragma GCC optimize("O3")
    
#define int long long
#define arr array<int, 3>
#define pii pair<int, int>
    
vector<vector<arr>> graph;
    
int lim = 1e18;
    
int32_t main()
{
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    
    int n, m;
    cin >> n >> m;
    
    graph.assign(n, vector<arr>());
    vector<map<int, int>> cost(n);
    vector<map<int, int>> dist(n);
    vector<map<int, vector<pii>>> colour(n);
    
    for (int j = 0; j < m; j++)
    {
        int a, b, c, d;
        cin >> a >> b >> c >> d;
        a--; b--; 
        graph[a].push_back({b, c, d});
        graph[b].push_back({a, c, d});
        cost[a][c] +=d;
        cost[b][c] += d;
        dist[a][c] = lim;
        dist[b][c] = lim;
        colour[a][c].push_back({b, d});
        colour[b][c].push_back({a, d});
    }
    
    for (int i = 0; i < n; i++) dist[i][0] = lim;
    
    priority_queue<arr, vector<arr>, greater<arr>> pq;
    
    pq.push({0, 0, 0,});
    while (pq.size())
    {
        arr a = pq.top();
        pq.pop();
        int d = a[0];
        int c = a[2];
        int i = a[1];
    
        if (dist[i][c]<=d) continue;
        dist[i][c] = d;
 
        if (c==0)
        {
            for (arr ele:graph[i])
            {
                pq.push({d+cost[i][ele[1]]-ele[2], ele[0], 0});
                pq.push({d, ele[0], ele[1]});
                pq.push({d+ele[2], ele[0], 0});
            }
        }
        else
        {
            for (pii ele:colour[i][c])
            {
                pq.push({d+cost[i][c]-ele.second, ele.first, 0});
            }
        }
    }
    if (dist[n-1][0]>=lim) cout << -1;
    else cout << dist[n-1][0];
    return 0;
}

• Subtask 1: 34 / 34
• Subtask 2: 24 / 24
• Subtask 3: 42 / 42