Submission #916818

#	Time	Username	Problem	Language	Result	Execution time	Memory
916818		maybe_baby	Robot (JOI21_ho_t4)	C++17	100 / 100	418 ms	45504 KiB

Main

#include <bits/stdc++.h>

#define x first
#define y second

using ll = long long;

using namespace std;

struct triple {
    int x, y;
    ll z;
};

struct four {
    int x, y;
    ll z, t;
};

int main() {
    int n, m;
    cin >> n >> m;
    int ans = 1;
    for (int i = 0; i < n * n; ++i) {
        ans *= 1032423;
        ans++;
    }
    vector<vector<four>> g(n);
    vector<vector<triple>> g1(n);
    for (int i = 0; i < m; i++) {
        int u, v, c;
        ll p;
        cin >> u >> v >> c >> p; u--; v--; c--;
        g1[u].push_back({v, c, p});
        g1[v].push_back({u, c, p});
    }
    vector<int> cnt(m, 0);
    vector<ll> sum(m, 0);
    for (int i = 0; i < n; i++) {
        for (auto [u, c, p] : g1[i]) {
            cnt[c]++;
            sum[c] += p;
        }
        for (auto [u, c, p] : g1[i]) {
            if (cnt[c] > 1) {
                g[i].push_back({u, c, p, sum[c] - p});
            } else {
                g[i].push_back({u, c, p, 0});
            }
        }
        for (auto [u, c, p] : g1[i]) {
            cnt[c]--;
            sum[c] -= p;
        }
    }
    set<pair<ll, int>> st;
    vector<ll> dist(n, INT64_MAX / 2), dist2(m, INT64_MAX / 2);
    vector<int> used(n, 0);
    dist[0] = 0;
    for (int i = 0; i < n; i++) {
        st.emplace(dist[i], i);
    }
    while (!st.empty()) {
        auto [d, s] = *st.begin();
        st.erase(st.begin());
        for (auto [i, c, p, w] : g[s]) {
            if (used[i]) {
                dist2[c] = min(dist[i], dist2[c]);
            }
        }
        used[s] = 1;
        for (auto [i, c, p, w] : g[s]) {
            if (!used[i]) {
                st.erase({dist[i], i});
                dist[i] = min(dist[i], min({d + w, dist2[c] + w, d + p}));
                st.emplace(dist[i], i);
            }
        }
        for (auto [i, c, p, w] : g[s]) {
            if (used[i]) {
                dist2[c] = INT64_MAX / 2;
            }
        }
    }
    if (dist[n - 1] == INT64_MAX / 2) {
        cout << "-1\n";
    } else {
        cout << dist[n - 1] << "\n";
    }
}

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