Submission #928514

#	Time	Username	Problem	Language	Result	Execution time	Memory
928514		12345678	Sightseeing (NOI14_sightseeing)	C++17	25 / 25	1769 ms	201268 KiB

sightseeing

#include <bits/stdc++.h>

using namespace std;

const int nx=5e5+5;
int n, m, q, u, v, w, dsu[nx], dp[nx];
vector<tuple<int, int, int>> ed;
vector<pair<int, int>> d[nx];

void dfs(int u, int p)
{
    for (auto [v, w]:d[u]) if (v!=p) dp[v]=min(dp[u], w), dfs(v, u);
}

int find(int x)
{
    if (dsu[x]==x) return x;
    return dsu[x]=find(dsu[x]);
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m>>q;
    for (int i=0; i<m; i++) cin>>u>>v>>w, ed.push_back({w, u, v});
    sort(ed.begin(), ed.end());
    reverse(ed.begin(), ed.end());
    for (int i=1; i<=n; i++) dsu[i]=i;
    for (auto [w, u, v]:ed) if (find(u)!=find(v)) dsu[find(u)]=find(v), d[u].push_back({v, w}), d[v].push_back({u, w});
    dp[1]=INT_MAX;
    dfs(1, 1);
    while (q--) cin>>u, cout<<dp[u]<<'\n';
}

/*
4 4 2
1 2 10
1 3 30
2 4 20
3 4 5
3
4
*/

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 6 / 6
• Subtask 4: 10 / 10