Submission #1003693

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003693		overwatch9	Robot (JOI21_ho_t4)	C++17	0 / 100	870 ms	2097152 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int maxn = 1e5 + 1;
vector <array <int, 3>> adj[maxn];
int main() {
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < m; i++) {
        int a, b, c, p;
        cin >> a >> b >> c >> p;
        adj[a].push_back({b, c, p});
        adj[b].push_back({a, c, p});
    }
    vector <vector <ll>> dis(n+1, vector <ll> (m+1, 1e18));
    fill(dis[1].begin(), dis[1].end(), 0);
    priority_queue <array <ll, 4>> pq;
    pq.push({0, 0, 0, 1});
    vector <vector <bool>> processed(n+1, vector <bool> (m+1));
    ll ans = 1e18;
    while (!pq.empty()) {
        int s = pq.top()[3];
        int col = pq.top()[1];
        int p = pq.top()[2];
        pq.pop();
        if (processed[s][col])
            continue;
        processed[s][col] = true;
        if (s == n)
            ans = min(ans, dis[s][col]);
        vector <int> cnt(m+1);
        for (auto i : adj[s]) {
            if (i[0] == p)
                cnt[col]++;
            else
                cnt[i[1]]++;
        }
        for (auto i : adj[s]) {
            for (int j = 1; j <= m; j++) {
                if (cnt[j] == 1 && dis[i[0]][j] > dis[s][col]) {
                    dis[i[0]][j] = dis[s][col];
                    pq.push({-dis[i[0]][j], j, p, i[0]});
                } else if (cnt[j] == 0 && dis[i[0]][j] > dis[s][col] + i[2]) {
                    dis[i[0]][j] = dis[s][col] + i[2];
                    pq.push({-dis[i[0]][j], j, p, i[0]});
                }
            }
        }
    }
    if (ans == 1e18)
        ans = -1;
    cout << ans << '\n';
}

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