제출 #792363

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
792363		1075508020060209tc	Sjekira (COCI20_sjekira)	C++14	40 / 110	1078 ms	5136 KiB

sjekira

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,popcnt,sse4,abm")
#include<bits/stdc++.h>
//#pragma GCC target("popcnt")
using namespace std;
#define int long long
#define X first
#define Y second
int n;
int ar[500005];
int uf[500005];
int gmx[500005];
//vector<int>e[500005];
int fin(int x){
if(uf[x]==x){return x;}
uf[x]=fin(uf[x]);
return uf[x];
}
void mrg(int a,int b){
int pa=fin(a);int pb=fin(b);
if(pa==pb){return;}
uf[pa]=pb;
gmx[pb]=max(gmx[pb],gmx[pa]);
}
pair<int,int>e[500005];

signed main()
{
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>ar[i];
        uf[i]=i;
        gmx[i]=ar[i];
    }
    for(int i=1;i<=n-1;i++){
        cin>>e[i].X>>e[i].Y;
    }
    int ans=0;
    for(int t=1;t<=n-1;t++){
        int gp=fin(1);
        for(int i=1;i<=n;i++){
            if(gmx[fin(i)]<gmx[gp]){
                gp=fin(i);
            }
        }
        int gp2=0;
        for(int i=1;i<=n-1;i++){
            int a=e[i].X;int b=e[i].Y;
            if(fin(a)==gp&&fin(b)==gp){continue;}
            if(fin(a)!=gp&&fin(b)!=gp){continue;}
            if(fin(b)==gp){swap(a,b);}
            if(gp2==0||gmx[gp2]>gmx[fin(b)]){
                gp2=fin(b);
            }
        }
        ans+=gmx[gp]+gmx[gp2];
        mrg(gp,gp2);
    }
    cout<<ans<<endl;
}

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