Submission #622946

#	Time	Username	Problem	Language	Result	Execution time	Memory
622946		inksamurai	Mag (COCI16_mag)	C++17	12 / 120	355 ms	201680 KiB

mag

#include <bits/stdc++.h>
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3SgiE60 ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using pii=pair<int,int>;
using vi=vector<int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}
// e

const int inf=1e13;

pii compare(const pii&l,const pii&r){
	return l.fi*r.se<r.fi*l.se?l:r;
}

signed main(){
_3SgiE60;
	int n;
	cin>>n;
	vec(vi) adj(n);
	rep(i,n-1){
		int u,v;
		cin>>u>>v;
		u-=1,v-=1;
		adj[u].pb(v);
		adj[v].pb(u);	
	}
	vi a(n);
	rep(i,n){
		cin>>a[i];
	}
	pii pns={inf,1};
	auto dfs=[&](auto self,int v,int par)->pii{
		pii q={inf,1};
		for(auto &u:adj[v]){
			if(u==par) continue;
			pii p=self(self,u,v);
			if(q.fi!=inf and q.fi*a[v]<inf/p.fi){
				pii now={q.fi*p.fi*a[v],p.se+q.se+1};
				pns=compare(pns,now);
			}
			q=compare(q,pii(p.fi*a[v],p.se+1));
			{
				pii now={p.fi*a[v],p.se+1};
				pns=compare(pns,now);
			}
		}
		q=compare(q,pii(a[v],1));
		return q;
	};
	dfs(dfs,0,-1);
	int g=gcd(pns.fi,pns.se);
	pns.fi/=g;
	pns.se/=g;
	cout<<pns.fi<<"/"<<pns.se<<"\n";
	// print(pns.fi,pns.se);
}

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• Subtask 5: 12 / 12
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