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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#662832#6438. Crystalfly122WA 2ms8304kbC++141.5kb2024-10-21 10:58:292024-10-21 10:58:29

Judging History

你现在查看的是最新测评结果

  • [2024-10-21 10:58:29]
  • 评测
  • 测评结果:WA
  • 用时:2ms
  • 内存:8304kb
  • [2024-10-21 10:58:29]
  • 提交

answer

#include <bits/stdc++.h>
#define LL long long
#define pair<int,int> PII
using namespace std;
const int N=1e5+10;
int f[N][2];//取不取叶子节点的节点u
int a[N],tot[N];
vector<int>g[N];
vector<int>G[N];
void dfs(int u,int fa)
{
	int maxx=0,res=0;f[u][0] = f[u][1] = 0;
	for(int v:G[u])
	{
		if(v==fa) continue;
		dfs(v,u);
		res+=f[v][1];
		maxx=max(a[v],maxx);
	}
	f[u][0]=res; f[u][1]=res+maxx;//取子节点和不取子节点的相对状态
	int max1=-2e18,t1=0,max2=-2e18,t2=0;
	if(g[u].size())
	{
		for(int v:g[u])//可以转移的相邻节点
		{
			if(v==fa) continue;
			if(a[v]>max1){max2=max1;t2=t1;max1=a[v];t1=v;}
			else if(a[v]>max2){max2=a[v];t2=v;}
			
		}int maxv=0;
		for(int v:G[u])
		{
			if(v==fa) continue;
			if(v==max1)
			{
				if(t2==0) maxv=max(maxv,f[v][0]+res-f[v][1]+a[v]);
				else maxv=max(maxv,f[v][0]-f[v][1]+a[v]+max2+res);
			}
			else maxv=max(maxv,f[v][0]-f[v][1]+a[v]+max1+res);
		}
		f[u][1]=max(f[u][1],maxv);
	}
}
void solve()
{
	int n;
	cin>>n;for(int i=1;i<=n;i++) g[i].clear(),G[i].clear();
	
	for(int i=1;i<=n;i++) cin>>a[i];
	for(int i=1;i<=n;i++) cin>>tot[i];
	for(int i=1;i<n;i++)
	{
		int a,b;
		cin>>a>>b;G[a].push_back(b);G[b].push_back(a);
		if(tot[a]==3)g[b].push_back(a);
		if(tot[b]==3)g[a].push_back(b);
	}
	dfs(1,0);
	cout<<f[1][1]+a[1]<<endl;
}
int main() {
//	ios_base::sync_with_stdio(false); 
	cin.tie(0); 
	cout.tie(0);
	int t=1;
    cin>>t;
	while (t--) solve();
	return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 8228kb

input:

2
5
1 10 100 1000 10000
1 2 1 1 1
1 2
1 3
2 4
2 5
5
1 10 100 1000 10000
1 3 1 1 1
1 2
1 3
2 4
2 5

output:

10101
10111

result:

ok 2 number(s): "10101 10111"

Test #2:

score: -100
Wrong Answer
time: 2ms
memory: 8304kb

input:

10
6
8 1 1 5 8 9
2 1 2 2 2 2
1 2
2 3
2 4
1 5
2 6
6
6 4 4 1 3 6
2 1 3 3 3 3
1 2
1 3
3 4
4 5
5 6
6
10 5 1 8 5 1
1 3 1 2 2 2
1 2
2 3
2 4
2 5
3 6
10
6 8 8 9 6 9 5 6 6 4
2 1 3 3 2 2 2 2 3 1
1 2
1 3
3 4
4 5
5 6
4 7
2 8
7 9
9 10
7
10 9 1 5 7 5 4
1 1 1 2 1 3 2
1 2
1 3
3 4
3 5
5 6
1 7
5
7 1 1 4 2
3 1 3 2 2
1...

output:

25
24
24
61
36
14
17
28
19
19

result:

wrong answer 4th numbers differ - expected: '56', found: '61'