Submission #447004

#	Time	Username	Problem	Language	Result	Execution time	Memory
447004		prvocislo	Cities (BOI16_cities)	C++17	100 / 100	2642 ms	43344 KiB

cities

#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

const ll inf = 1e18 + 5;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, k, m;
    cin >> n >> k >> m;
    vector<int> im(k);
    for (int i = 0; i < k; i++) 
        cin >> im[i], im[i]--;
    vector<vector<pair<int, int> > > g(n);
    for (int i = 0, a, b, c; i < m; i++)
        cin >> a >> b >> c, g[--a].push_back({--b, c}), g[b].push_back({a, c});
    vector<vector<ll> > dp((1 << k), vector<ll>(n, inf));
    dp[0].assign(n, 0);
    priority_queue<pair<ll, int> > pq;
    for (int m = 1; m < (1 << k); m++)
    {
        for (int i = 0; i < n; i++)
        {
            int id = find(im.begin(), im.end(), i) - im.begin();
            if (m & (1 << id)) dp[m][i] = dp[m^(1 << id)][i];
            else for (int s = m; s; s = (s-1)&m)
                dp[m][i] = min(dp[m][i], dp[s][i] + dp[m^s][i]);
            pq.push({-dp[m][i], i});
        }
        vector<bool> vis(n, false);
        while (!pq.empty())
        {
            ll d = -pq.top().first; int u = pq.top().second;
            pq.pop();
            if (vis[u]) continue;
            vis[u] = true;
            for (const pair<int, int> &i : g[u])
            {
                if (!vis[i.first] && dp[m][i.first] > d + i.second)
                {
                    dp[m][i.first] = d + i.second;
                    pq.push({-dp[m][i.first], i.first});
                }
            } 
        }
    }
    cout << (*min_element(dp[(1<<k)-1].begin(), dp[(1<<k)-1].end())) << "\n";
    return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 14 / 14
• Subtask 3: 15 / 15
• Subtask 4: 23 / 23
• Subtask 5: 26 / 26