이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N=300010, M = 1e9 + 7;
ll n,m,a,b,plague[N],root[N],ans;
vector<int> edges[N];
priority_queue<ll> q[N];
void dfs(int u){
root[u]=u;
if(u>n){
q[u].push(plague[u]);
q[u].push(plague[u]);
return;
}
for(auto v:edges[u]){
dfs(v);
if(q[root[v]].size() > q[root[u]].size()) root[u]=root[v];
}
for(auto v : edges[u])
if(root[v]!=root[u]){
while(q[root[v]].size()){
q[root[u]].push(q[root[v]].top());
q[root[v]].pop();
}
}
for (int i = 1; i < (int) edges[u].size(); i++) q[root[u]].pop();
a=q[root[u]].top(); q[root[u]].pop(); b=q[root[u]].top(); q[root[u]].pop();
a+=plague[u]; b+=plague[u]; q[root[u]].push(b); q[root[u]].push(a);
}
int main(){
ios_base::sync_with_stdio(0); cin.tie(0);
cin >> n >> m;
m += n;
for (int i = 2; i <= m; i++){
cin>>a>>b;
edges[a].push_back(i);
plague[i]=b; ans+=b;
}
dfs(1);
q[root[1]].pop();
a=q[root[1]].top();
q[root[1]].push(0);
b=0;
while(q[root[1]].size() > 0){
ans-=(a - q[root[1]].top()) * b;
b++;
a=q[root[1]].top();
q[root[1]].pop();
}
cout<<ans << "\n";
return 0;
}
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