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Cod sursa(job #845523)
#include <cstdio>
#include <vector>
using namespace std;
int m=-16000000;
int n,viz[16100];
int c[16100];
vector <int> v[16100];
void bfs(int l)
{
viz[l]=1;
if(c[l]>m)
m=c[l];
for(int i=0;i<v[l].size();i++)
{
if(!viz[v[l][i]])
{
bfs(v[l][i]);
if(c[v[l][i]]>0)
{
c[l]+=c[v[l][i]];
if(c[l]>m)
m=c[l];
}
}
}
}
int main()
{
freopen("asmax.in","r",stdin);
freopen("asmax.out","w",stdout);
scanf("%d",&n);
for(int i=1;i<=n;i++)
scanf("%d",&c[i]);
int a,b;
for(int i=1;i<n;i++)
{
scanf("%d%d",&a,&b);
v[a].push_back(b);
v[b].push_back(a);
}
bfs(1);
printf("%d",m);
return 0;
}