Submission #854844

#	Time	Username	Problem	Language	Result	Execution time	Memory
854844		NeroZein	Sjekira (COCI20_sjekira)	C++17	0 / 110	29 ms	5840 KiB

sjekira

#include "bits/stdc++.h"
using namespace std;

#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif

const int N = 2e5 + 5; 

int a[N]; 
int p[N], sz[N], mx[N]; 

int get(int v) {
  return p[v] = (p[v] == v ? v : get(p[v])); 
}

void unite(int u, int v) {
  if (sz[u] > sz[v]) swap(u, v);
  sz[v] += sz[u];
  p[u] = v;
  mx[v] = max(mx[v], mx[u]); 
}

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n;
  cin >> n;
  for (int i = 1; i <= n; ++i) {
    cin >> a[i]; 
  }
  vector<array<int, 4>> e(n - 1); 
  for (int i = 0; i < n - 1; ++i) {
    int u, v;
    cin >> u >> v;
    if (a[u] > a[v]) swap(u, v);
    e[i] = {a[u], a[v], u, v};  
  }
  for (int i = 1; i <= n; ++i) {
    p[i] = i;
    sz[i] = 1; 
    mx[i] = a[i]; 
  }
  sort(e.begin(), e.end()); 
  long long ans = 0; 
  for (int i = 0; i < n - 1; ++i) {
    auto [x, y, u, v] = e[i];
    u = get(u), v = get(v);
    ans += mx[u] + mx[v]; 
    unite(u, v); 
  }
  cout << ans << '\n'; 
  return 0;
}

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