Cod sursa(job #2343077)

Utilizator gabriel2506Dobre Gabriel gabriel2506 Data 13 februarie 2019 17:52:31
Problema Asmax Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.81 kb
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

ifstream fin("asmax.in");
ofstream fout("asmax.out");

const int N=100001;
int mx=-10000;
vector <int> a[N];

int s[N];

int n,m,X=1;
bool viz[N];

void read()
{
    int x,y,i;
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>s[i];
    }
    for(i =0;i<n-1;i++)
    {
        fin>>x>>y;
        a[x].push_back(y);
        a[y].push_back(x);
    }
    fin.close();
}

void dfs(int x)
{
    viz[x]=true;
    for(auto y:a[x])
    {
        if(!viz[y])
        {
            dfs(y);
            if(s[y]>0)
            {
                s[x]+=s[y];
            }
        }
    }
}

int main()
{
    read();
    dfs(X);
    for(int i=1;i<=n;i++)
    {
        if(s[i]>mx)
        {
            mx=s[i];
        }
    }
    fout<<mx;
    return 0;
}