Submission #1012312

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012312		codefox	Robot (JOI21_ho_t4)	C++14	0 / 100	3071 ms	689296 KiB

Main

#include<bits/stdc++.h>
    
using namespace std;
    
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
    
#define int long long
#define arr array<int, 5>
#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);
    vector<int> mn(n, lim);
    
    for (int j = 0; j < m; j++)
    {
        int a, b, c, d;
        cin >> a >> b >> c >> d;
        a--; b--; c--;
        graph[a].push_back({b, c, d, 0, 0});
        graph[b].push_back({a, c, d, 0, 0});
    }
    
    for (int i = 0; i < n; i++)
    {
        for (arr ele:graph[i])
        {
            cost[i][ele[1]] += ele[2];
            dist[ele[0]][ele[1]] = lim;
            colour[i][ele[1]].push_back({ele[0], ele[2]});
        }
        dist[i][0] = lim;
    }
    
    priority_queue<arr, vector<arr>, greater<arr>> pq;
    
    pq.push({0, 0, 0, 0, 0});
    while (pq.size())
    {
        arr a = pq.top();
        pq.pop();
        int d = a[0];
        int c = a[1];
        int i = a[2];
        int cc = a[3];
        int pc = a[4];
    
        if (mn[i]==lim && c<=0)
        {
            for (arr ele:graph[i])
            {
                pq.push({d+ele[2], 0, ele[0], ele[1], 0});
            }
            mn[i] = d;
        }
        if (c==-1) continue;
        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]*2, ele[1], ele[0], ele[1], ele[2]});
                pq.push({d+cost[i][ele[1]]-ele[2], -1, ele[0], ele[1], ele[2]});
                pq.push({d+ele[2], 0, ele[0], ele[1], ele[2]});
            }
        }
        else
        {
            for (pii ele:colour[i][c])
            {
                pq.push({d+cost[i][c]-ele.second*2, c, ele.first, pc, ele.second});
                pq.push({d+cost[i][c]-ele.second, -1, ele.first, 0, 0});
            }
        }
 
    }
    if (mn[n-1]>=lim) cout << -1;
    else cout << mn[n-1];
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:64:13: warning: unused variable 'cc' [-Wunused-variable]
   64 |         int cc = a[3];
      |             ^~

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42