제출 #210350

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
210350		emanIaicepsa	Paprike (COI18_paprike)	C++14	100 / 100	81 ms	15484 KiB

paprike

#include<bits/stdc++.h>
#define IOS ios::sync_with_stdio(0),cin.tie(0);
#define ll long long
#define int ll
#define pii pair<int,int>
#define pb push_back
#define fi first
#define se second
#define all(n) (n).begin(),(n).end()
using namespace std;
ll val[100005];
vector<int> E[100005];
ll res[100005];
int ans = 0;
ll n,k;
void dfs(int x,int p){
	res[x] = val[x];
	vector<ll> tmp;
	for(auto i:E[x]){
		if(i==p)continue;
		dfs(i,x);
		tmp.pb(res[i]);
	}
	sort(all(tmp));
	for(auto i:tmp){
		if(res[x]+i>k)ans++;
		else res[x]+=i;
	}
}

signed main(){
	IOS;
	
	cin>>n>>k;
	for(int i=1;i<=n;i++){
		cin>>val[i];
	}
	for(int i=1,a,b;i<n;i++){
		cin>>a>>b;
		E[a].pb(b);
		E[b].pb(a);
	}
	dfs(1,0);
	cout<<ans<<'\n';
}

• Subtask 1: 11 / 11
• Subtask 2: 13 / 13
• Subtask 3: 27 / 27
• Subtask 4: 49 / 49