Submission #472123

#	Time	Username	Problem	Language	Result	Execution time	Memory
472123		abc864197532	Sjekira (COCI20_sjekira)	C++17	40 / 110	87 ms	10460 KiB

sjekira

/*
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 * ###### #    # #         #    # # ## # #    #
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 */
#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define X first
#define Y second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define info() cout << __PRETTY_FUNCTION__ << ": " << __LINE__ << endl
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T a, U ...b) {
    cout << a << ' ', abc(b...);
}
template <typename T> void printv(T l, T r) {
    while (l != r) cout << *l << " \n"[++l == r];
}
template <typename A, typename B> istream& operator >> (istream& o, pair<A, B> &a) {
    return o >> a.X >> a.Y;
}
template <typename A, typename B> ostream& operator << (ostream& o, pair<A, B> a) {
    return o << '(' << a.X << ", " << a.Y << ')';
}
template <typename T> ostream& operator << (ostream& o, vector<T> a) {
    bool is = false;
    if (a.empty) o << '{';
    for (T i : a) {o << (is ? ' ' : '{'), is = true, o << i;}
    return o << '}';
}
template <typename T> struct vv : vector <vector <T>> {
    vv(int n, int m, T v) : vector <vector <T>> (n, vector <T>(m, v)) {}
    vv() {}
};
template <typename T> struct vvv : vector <vv <T>> {
    vvv(int n, int m, int k, T v) : vector <vv <T>> (n, vv <T>(m, k, v)) {}
    vvv() {}
};
#ifdef Doludu
#define test(args...) info(), abc("[" + string(#args) + "]", args)
#define owo freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#else
#define test(args...) void(0)
#define owo ios::sync_with_stdio(false); cin.tie(0)
#endif
const int mod = 1e9 + 7, N = 200001, logN = 20, K = 80000;

vector <int> adj[N];
vector <int> dsu;

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

int main () {
    owo;
    int n;
    cin >> n;
    vector <int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    for (int i = 0, u, v; i < n - 1; ++i) {
        cin >> u >> v, --u, --v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    vector <int> p(n);
    iota(all(p), 0);
    sort(all(p), [&](int i, int j) {
        return a[i] > a[j];
    });
    dsu.resize(n);
    iota(all(dsu), 0);
    vector <pii> tmp;
    lli ans = 0;
    for (int i : p) {
        for (int j : adj[i]) if (a[i] > a[j]) {
            tmp.eb(i, j);
        }
    }
    reverse(all(tmp));
    for (pii i : tmp) {
        ans += a[Find(i.X)] + a[Find(i.Y)];
        i.X = Find(i.X), i.Y = Find(i.Y);
        if (a[i.X] > a[i.Y]) swap(i.X, i.Y);
        dsu[i.X] = i.Y;
    }
    cout << ans << endl;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 30 / 30
• Subtask 4: 0 / 60