제출 #374358

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
374358		VEGAnn	Sjekira (COCI20_sjekira)	C++14	40 / 110	1089 ms	2668 KiB

sjekira

#include <bits/stdc++.h>
#define MP make_pair
#define PB push_back
#define all(x) x.begin(),x.end()
#define i3 array<int,3>
#define pi3 pair<pair<int, int>, int>
#define ft first
#define sd second
using namespace std;
typedef long double ld;
typedef long long ll;
const ld E = 1e-9;
const int oo = 2e9;
const int N = 100100;
vector<pi3> edgs;
int n, pre[N], U[N], V[N];
bool mrk[N];
ll t[N], mx[N], ans = 0;

int get(int x) { return (pre[x] == x ? x : pre[x] = get(pre[x])); }

int get_val(int id){
    return mx[get(U[id])] + mx[get(V[id])];
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

#ifdef _LOCAL
    freopen("in.txt","r",stdin);
#endif // _LOCAL

    cin >> n;

    for (int i = 0; i < n; i++) {
        cin >> t[i];
        pre[i] = i;
        mx[i] = t[i];
    }

    for (int i = 1; i < n; i++){
        int x, y; cin >> x >> y; x--; y--;

        U[i] = x; V[i] = y;

//        edgs.PB({t[x] + t[y], x, y});
//        edgs.PB(MP(MP(t[x] + t[y], x), y));
    }

    for (int it = 1; it < n; it++){
        ll best = oo + 10, id = -1;

        for (int i = 1; i < n; i++){
            if (mrk[i]) continue;

            ll cur = get_val(i);

            if (cur < best){
                best = cur;
                id = i;
            }
        }

        mrk[id] = 1;

        ans += best;

        mx[get(U[id])] = max(mx[get(U[id])], mx[get(V[id])]);
        pre[get(V[id])] = get(U[id]);
    }

//    sort(all(edgs));
//
//    for (pi3 cr : edgs){
////        int x = cr[1], y = cr[2];
//        int x = cr.ft.sd, y = cr.sd;
//
//        x = get(x);
//        y = get(y);
//
//        ans += mx[x];
//        ans += mx[y];
//
//        mx[x] = max(mx[x], mx[y]);
//        pre[y] = x;
//    }

    cout << ans;

    return 0;
}

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