Submission #622909

#	Time	Username	Problem	Language	Result	Execution time	Memory
622909		inksamurai	Mag (COCI16_mag)	C++17	0 / 120	459 ms	262144 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};
	vec(vec(pii)) rbts(n);
	vi dist(n);
	auto dfs=[&](auto self,int v,int par,int num)->void{
		dist[v]=num;
		vi chs;
		for(auto &u:adj[v]){
			if(u==par) continue;
			chs.pb(u);
			self(self,u,v,num+1);
		}
		vec(pii) ps;
		{
			for(auto &u:chs){
				pii p={inf,1};
				rep(i,sz(rbts[u])){
					int _u=rbts[u][i].se;
					int _prod=rbts[u][i].fi;
					int _dist=dist[_u]-num;
					if(i==0){
						p={_prod,_dist};
					}else{
						p=compare(pii{_prod,_dist},p);
					}
				}
				if(!sz(ps)){
					ps.pb(p);
				}else{
					ps.pb(compare(ps.back(),p));
				}
			}
		}
		vec(pii) sp;
		{
			per(j,sz(chs)){
				int u=chs[j];
				pii p={inf,1};
				rep(i,sz(rbts[u])){
					int _u=rbts[u][i].se;
					int _prod=rbts[u][i].fi;
					int _dist=dist[_u]-num;
					if(i==0){
						p={_prod,_dist};
					}else{
						p=compare(pii{_prod,_dist},p);
					}
				}
				if(!sz(sp)){
					sp.pb(p);
				}else{
					sp.pb(compare(sp.back(),p));
				}
			}
			reverse(sp.begin(), sp.end());
		}
		rep(j,sz(chs)){
			int u=chs[j];
			rep(i,sz(rbts[u])){
				int _u=rbts[u][i].se;
				int _prod=rbts[u][i].fi;
				int _dist=dist[_u]-num;
				pii p={inf,1};
				// if(j){
				// 	p=compare(p,ps[j-1]);
				// }
				// if(j+1<sz(chs)){
				// 	p=compare(p,sp[j+1]);
				// }
				// if(p.fi<inf and p.fi<inf/a[v] and a[v]*_prod<inf/p.fi){
				// 	pii now={p.fi*_prod*a[v],_dist+p.se+1};
				// 	pns=compare(pns,now);
				// }
			}
		}
		// if(sz(ps)){
		// 	pii p=ps.back();
		// 	if(p.fi<inf/a[v]){
		// 		pns=compare(pns,pii(p.fi*a[v],p.se+1));
		// 	}
		// }
		rep(j,sz(chs)){
			int u=chs[j];
			for(auto p:rbts[u]){
				int _u=p.se;
				int _prod=p.fi;
				if(_prod<inf/a[v]){
					// rbts[v].pb(pii(_prod*a[v],_u));
				}else{
					// 
				}
			}
		}
		// }else{
		// 	rep(j,sz(chs)){
		// 		int u=chs[j];
		// 		for(auto p:rbts[u]){
		// 			int _u=p.se;
		// 			int _prod=p.fi;
		// 			int _dist=dist[_u]-num;
		// 			// print(a[v],_u,_prod);
		// 			rbts[v].pb(pii(_prod,_u));
		// 			pns=compare(pns,pii(_prod,_dist+1));
		// 		}
		// 	}
		// }
		rbts[v].pb(pii(a[v],v));
		pns=compare(pns,pii(a[v],1));
	};
	dfs(dfs,0,-1,0);
	int g=gcd(pns.fi,pns.se);
	pns.fi/=g;
	pns.se/=g;
	cout<<pns.fi<<"/"<<pns.se<<"\n";
	// print(pns.fi,pns.se);
}

Compilation message (stderr)

mag.cpp: In instantiation of 'main()::<lambda(auto:23, ll, ll, ll)> [with auto:23 = main()::<lambda(auto:23, ll, ll, ll)>; ll = long long int]':
mag.cpp:150:16:   required from here
mag.cpp:101:9: warning: unused variable '_prod' [-Wunused-variable]
  101 |     int _prod=rbts[u][i].fi;
      |         ^~~~~
mag.cpp:102:9: warning: unused variable '_dist' [-Wunused-variable]
  102 |     int _dist=dist[_u]-num;
      |         ^~~~~
mag.cpp:103:9: warning: variable 'p' set but not used [-Wunused-but-set-variable]
  103 |     pii p={inf,1};
      |         ^
mag.cpp:125:9: warning: unused variable '_u' [-Wunused-variable]
  125 |     int _u=p.se;
      |         ^~

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