Submission #640881

#	Time	Username	Problem	Language	Result	Execution time	Memory
640881		devariaota	Cities (BOI16_cities)	C++17	14 / 100	327 ms	19936 KiB

cities

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
const ll mod=1e9+7;
const ll maxn=1e5+5;
const ll INF=1e18;
#define ok ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fi first
#define se second
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define endl '\n'
int n, k, m, arr[5], u, v, w;
ll dis[maxn][5], ans=INF;
vector<pii> adj[maxn];
int main() {
    ok
    cin >> n >> k >> m;
    for(int i=0; i<k; i++) cin >> arr[i];
    for(int i=0; i<m; i++) {
        cin >> u >> v >> w;
        adj[u].pb({v, w});
        adj[v].pb({u, w});
    }
    for(int i=0; i<k; i++) {
        for(int j=1; j<=n; j++) dis[j][i]=INF;
        dis[arr[i]][i]=0;
        priority_queue<pll, vector<pll>, greater<pll>> pq;
        pq.push({0, arr[i]});
        while(!pq.empty()) {
            pll fr=pq.top();
            pq.pop();
            if(fr.fi>dis[fr.se][i]) continue;
            for(auto it : adj[fr.se]) {
                if(dis[it.fi][i]>dis[fr.se][i]+it.se) {
                    dis[it.fi][i]=dis[fr.se][i]+it.se;
                    pq.push({dis[it.fi][i], it.fi});
                }
            }
        }
    }
    for(int i=1; i<=n; i++) {
        ll cur=0;
        for(int j=0; j<k; j++) cur+=dis[i][j];
        ans=min(ans, cur);
    }
    cout << ans;
}

• Subtask 1: 0 / 22
• Subtask 2: 14 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 23
• Subtask 5: 0 / 26