Submission #1007703

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007703		otarius	Cities (BOI16_cities)	C++17	100 / 100	1802 ms	45868 KiB

cities

#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
#include <cstring>
#include <queue>
#include <map>
#include <cmath>
#include <iomanip>
using namespace std;
 
#define ff first
#define sc second
#define pb push_back
#define ll long long
#define pll pair<ll, int>
#define pii pair <int, int>
#define ull unsigned long long
 
// #define int long long
// #define int unsigned long long
 
const ll inf = 1e18 + 7;
const ll weirdMod = 998244353;
 
vector<vector<pii>> G;
void solve() {
    int n, k, m;
    cin >> n >> k >> m; G.resize(n + 1);
    ll dp[n + 1][1 << k]; int f[k];
    for (int i = 1; i <= n; i++)
        for (int j = 0; j < (1 << k); j++) dp[i][j] = inf;
    for (int i = 0; i < k; i++) {
        cin >> f[i]; dp[f[i]][1 << i] = 0;
    } for (int i = 1; i <= m; i++) {
        int x, y, z;
        cin >> x >> y >> z;
        G[x].pb({y, z}); G[y].pb({x, z});
    } for (int msk = 1; msk < (1 << k); msk++) {
        for (int j = 0; j < k; j++) {
            if (!(msk & (1 << j))) continue;
            int msk2 = (msk ^ (1 << j));
            for (int i = 1; i <= n; i++)
                dp[i][msk] = min(dp[i][msk], dp[i][1 << j] + dp[i][msk2]);
        } priority_queue<pll, vector<pll>, greater<pll>> q;
        for (int i = 1; i <= n; i++)
            q.push({dp[i][msk], i});
        while (q.size()) {
            auto [w, u] = q.top(); q.pop();
            if (dp[u][msk] != w) continue;
            for (auto [v, wgt] : G[u]) {
                if (dp[v][msk] > dp[u][msk] + wgt)
                    q.push({dp[v][msk] = dp[u][msk] + wgt, v});
            }
        }
    } ll mn = inf;
    for (int i = 1; i <= n; i++) {
        mn = min(mn, dp[i][(1 << k) - 1]);
    } cout << mn;
}
int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
        cout << '\n';
    }
    return 0;
}

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