Submission #924526

#	Time	Username	Problem	Language	Result	Execution time	Memory
924526		crafticat	Robot (JOI21_ho_t4)	C++17	0 / 100	199 ms	22752 KiB

Main

#include <bits/stdc++.h>

using namespace std;

using pii = pair<int,int>;
constexpr int inf = 1e9 + 7;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr);

    int n, m; cin >> n >> m;

    vector<vector<tuple<int,int,int>>> f(n + 1);
    for (int i = 0; i < m; ++i) {
        int a, b, c, d; cin >> a >> b >> c >> d;
        f[a].emplace_back(c,b,d);
        f[b].emplace_back(c,a,d);
    }

    vector<vector<pii>> g(n + 1);
    for (int i = 1; i <= n; ++i) {
        map<int, int> app;
        for (auto [c, node, d] : f[i]) {
            app[c]++;
        }

        for (auto [c, node, d] : f[i]) {
            if (app[c] == 1) g[i].emplace_back(node,0);
            else g[i].emplace_back(node,d);
        }
    }

    priority_queue<pii,vector<pii>,greater<>> pq;
    pq.emplace(0,1);

    vector<int> d(n + 1,inf);
    vector<bool> visited(n + 1);

    while (!pq.empty()) {
        auto [cost, cur] = pq.top();pq.pop();
        if (visited[cur]) continue;
        d[cur] = cost;
        visited[cur] = true;

        for (auto [child, len] : g[cur]) {
            if (visited[child]) continue;
            pq.emplace(len + cost,child);
        }
    }

    cout << d[n];
    return 0;
}

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