Submission #1024039

#	Time	Username	Problem	Language	Result	Execution time	Memory
1024039		kustizus	Sjekira (COCI20_sjekira)	C++17	110 / 110	38 ms	10192 KiB

sjekira

#include <bits/stdc++.h>
using namespace std;
const int N = 1e5;
int n, ds[N + 5], M[N + 5];
vector<int> g[N + 5];
int Get(int pos)
{
    if (pos == ds[pos])
        return pos;
    return ds[pos] = Get(ds[pos]);
}
void Join(int u, int v)
{
    u = Get(u), v = Get(v);
    M[u] = max(M[u], M[v]);
    ds[v] = u;
}
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    // freopen ("file.inp","r",stdin);
    // freopen ("file.out","w",stdout);
    cin >> n;
    vector<pair<int, int>> v;
    for (int i = 1; i <= n; i++)
    {
        int a;
        cin >> a;
        M[i] = a;
        ds[i] = i;
        v.push_back({a, i});
    }
    for (int i = 1; i < n; i++)
    {
        int u, v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    long long ans = 0;
    sort(v.begin(), v.end());
    for (int i = 0; i < n; i++)
    {
        int pos = v[i].second;
        for (int j : g[pos])
            if (Get(pos) != Get(j) && M[Get(pos)] >= M[(Get(j))])
            {
                ans += M[Get(j)] + M[Get(pos)];
                Join(pos, j);
            }
    }
    cout << ans;
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 30 / 30
• Subtask 4: 60 / 60