Submission #1281661

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281661		gay	Robot (JOI21_ho_t4)	C++20	34 / 100	1741 ms	2162688 KiB

Main

#include <bits/stdc++.h>
#include <experimental/random>
#include <random>

using namespace std;

using ll = long long;
using ld = long double;

const ll INF = 1e18, MOD = 1e9 + 7;

void solve();

signed main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int q = 1;
    //cin >> q;
    while (q--) {
        solve();
    }
}

struct e {
    ll v, c, d;
};

struct str {
    ll u, c, d, f;

    bool operator<(str a) const {
        return u < a.u || (u == a.u && c < a.c) || (u == a.u && c == a.c && d < a.d) ||
               (u == a.u && c == a.c && d == a.d && f < a.f);
    }
};

void solve() {
    ll n, m;
    cin >> n >> m;
    vector<vector<e>> g(n);
    vector<unordered_map<ll, ll>> cnt(n);
    for (int i = 0; i < m; i++) {
        ll a, b, c, d;
        cin >> a >> b >> c >> d;
        a--, b--;
        cnt[a][c] += d;
        cnt[b][c] += d;
        g[a].push_back({b, c, d});
        g[b].push_back({a, c, d});
    }

    vector<vector<vector<ll>>> dp(n, vector<vector<ll>>(m + 1, vector<ll>(2, INF)));
    dp[0][0][0] = 0;
    dp[0][0][1] = 0;
    set<pair<ll, str>> dj;
    dj.insert({0, {0, 0, 0, 0}});
    while (!empty(dj)) {
        ll w = dj.begin()->first;
        ll u = dj.begin()->second.u;
        ll dd = dj.begin()->second.d;
        ll color = dj.begin()->second.c;
        ll f = dj.begin()->second.f;

        if (f) {
            cnt[u][color] -= dd;
        }

        dj.erase(dj.begin());
        for (auto [v, c, d]: g[u]) {
            ll cost = w + d;
            if (dp[v][c][1] > cost) {
                dj.erase({dp[v][c][1], {v, c, d, 1}});
                dp[v][c][1] = cost;
                dj.insert({dp[v][c][1], {v, c, d, 1}});
            }

            cost = w + (cnt[u][c] - d);
            if (dp[v][c][0] > cost) {
                dj.erase({dp[v][c][0], {v, c, d, 0}});
                dp[v][c][0] = cost;
                dj.insert({dp[v][c][0], {v, c, d, 0}});
            }
        }

        if (f) {
            cnt[u][color] += dd;
        }
    }
    ll ans = INF;
    for (int i = 0; i <= m; i++) {
        ans = min(ans, dp[n - 1][i][0]);
        ans = min(ans, dp[n - 1][i][1]);
    }
    if (ans == INF) {
        cout << -1;
    } else {
        cout << ans;
    }
}

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