Submission #128088

#	Time	Username	Problem	Language	Result	Execution time	Memory
128088		faustaadp	Chase (CEOI17_chase)	C++17	50 / 100	4011 ms	100132 KiB

chase

#include<bits/stdc++.h>
typedef long long ll;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
ll n,k,i,a[101010],ta,tb,x[101010],has;
vector<ll> v[101010];
ll d[100010][110];
ll depe(ll aa,ll bb,ll cc)
{
	if(d[aa][bb]==-1)
	{
		d[aa][bb]=0;
		ll ii;
		for(ii=0;ii<v[aa].size();ii++)
		{
			if(v[aa][ii]==cc)continue;
			d[aa][bb]=max(d[aa][bb],depe(v[aa][ii],bb,aa));
			if(bb)
				d[aa][bb]=max(d[aa][bb],depe(v[aa][ii],bb-1,aa)+x[aa]-a[cc]);
		}
	}
	return d[aa][bb];
}
int main()
{
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>n>>k;
	for(i=1;i<=n;i++)
		cin>>a[i];
	for(i=1;i<n;i++)
	{
		cin>>ta>>tb;
		v[ta].pb(tb);
		v[tb].pb(ta);
		x[ta]+=a[tb];
		x[tb]+=a[ta];
	}
	for(i=1;i<=n;i++)
	{
		memset(d,-1,sizeof(d));
		has=max(has,depe(i,k,0));
		if(n>1000)break;
	}
	cout<<has<<"\n";
}

Compilation message (stderr)

chase.cpp: In function 'll depe(ll, ll, ll)':
chase.cpp:17:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(ii=0;ii<v[aa].size();ii++)
            ~~^~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 30 / 30
• Subtask 4: 0 / 30