Submission #793078

#	Time	Username	Problem	Language	Result	Execution time	Memory
793078		1075508020060209tc	Sjekira (COCI20_sjekira)	C++14	0 / 110	82 ms	20328 KiB

sjekira

#include <bits/stdc++.h>
using namespace std;
#define int long long
int n;
int ar[500005];
vector<int>e[500005];
int uf[500005];
int umx[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;
umx[pb]=max(umx[pa],umx[pb]);
}

signed main() {
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>ar[i];
        uf[i]=i;
        umx[i]=ar[i];
    }
    for(int i=1;i<=n-1;i++){
        int a;int b;
        cin>>a>>b;
        e[a].push_back(b);
        e[b].push_back(a);
    }
    int ans=0;
    vector<pair<int,int>>seq;
    for(int i=1;i<=n;i++){
        seq.push_back({ar[i],i});
    }
    //cout<<"hihi";
    sort(seq.begin(),seq.end());
    for(int i=0;i<seq.size();i++){
        int nw=seq[i].second;
        for(int j=0;j<e[nw].size();j++){
            int v=e[nw][j];
            if(fin(v)==fin(nw)){continue;}
            ans+=umx[fin(v)]+umx[fin(nw)];
            mrg(v,nw);
        }
    }
    cout<<ans<<endl;
    return 0;
}

Compilation message (stderr)

sjekira.cpp: In function 'int main()':
sjekira.cpp:42:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for(int i=0;i<seq.size();i++){
      |                 ~^~~~~~~~~~~
sjekira.cpp:44:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         for(int j=0;j<e[nw].size();j++){
      |                     ~^~~~~~~~~~~~~

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