QOJ.ac

QOJ

ID题目提交者结果用时内存语言文件大小提交时间测评时间
#687613#7684. Sweet SugarxcyyyyyWA 2ms5684kbC++20871b2024-10-29 19:59:432024-10-29 19:59:44

Judging History

你现在查看的是最新测评结果

  • [2024-10-29 19:59:44]
  • 评测
  • 测评结果:WA
  • 用时:2ms
  • 内存:5684kb
  • [2024-10-29 19:59:43]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define N 1000005
#define fr first
#define se second
#define pii pair<int,int>
int n,k,a[N];
vector<int> G[N];
pii f[N][2];
pii operator + (const pii &x,const pii &y){
	return {x.fr+y.fr,x.se+y.se};
}
void dfs(int u,int fa){
	f[u][0]={0,0};
	f[u][a[u]&1]={0,a[u]};
	for(int v:G[u])if(v^fa){
		pii g0=f[u][0],g1=f[u][1];
		dfs(v,u);
		f[u][0]=max(g0+f[v][0],g1+f[v][1]);
		f[u][1]=max(g1+f[v][0],g0+f[v][1]);
	}
	if(f[u][k&1].se>=k)f[u][0]=max(f[u][0],pii{f[u][k&1].fr+1,0});
}
void sol(){
	scanf("%d%d",&n,&k);
	for(int i=1;i<=n;i++)G[i].clear();
	for(int i=1;i<=n;i++)scanf("%d",&a[i]);
	for(int i=1,u,v;i<n;i++){
		scanf("%d%d",&u,&v);
		G[u].push_back(v);
		G[v].push_back(u);
	}
	dfs(1,0);
	cout<<max(f[1][1].fr,f[1][0].fr)<<endl;
}
int main(){
	int t;scanf("%d",&t);while(t--)sol();
}

详细

Test #1:

score: 0
Wrong Answer
time: 2ms
memory: 5684kb

input:

4
7 5
1 2 1 2 2 1 2
1 2
2 3
3 4
3 5
5 6
5 7
2 2
1 0
1 2
1 1
1
1 2
1

output:

2
2
1
0

result:

wrong answer 2nd numbers differ - expected: '0', found: '2'