Submission #1108910

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108910		LM1	Sjekira (COCI20_sjekira)	C++14	110 / 110	40 ms	4500 KiB

sjekira

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define pb push_back
#define ff first
#define ss second
const int N=1e5+5;
ll ans;
int n,a[N];
int p[N],sz[N];
pii v[N];
bool compare(pii a1,pii a2){
	return a[a1.ff]<a[a2.ff];
}
int find(int x){
	if(x==p[x])return x;
	return p[x]=find(p[x]);
}
void merge(int x,int y){
	x=find(x);
	y=find(y);
	if(sz[x]<sz[y])swap(x,y);
	ans+=a[x]+a[y];
	p[y]=x;
	sz[x]+=sz[y];
	a[x]=max(a[x],a[y]);
}
int main(){
	ios_base::sync_with_stdio(NULL);cin.tie(NULL);
	cin>>n;
	for(int i=1;i<=n;i++){
		p[i]=i;
		sz[i]=1;
		cin>>a[i];
	}
	for(int i=0;i<n-1;i++){
		int aa,bb;cin>>aa>>bb;
		if(a[aa]<a[bb])swap(aa,bb);
		v[i]={aa,bb};
	}
	sort(v,v+n-1,compare);
	for(int i=0;i<n-1;i++){
		int x=v[i].ff,y=v[i].ss;
		merge(x,y);
	}
	cout<<ans;
}

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