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#include <bits/stdc++.h>
 
using namespace std;
const long long N=1e5+3,big=1e18,mod=1e9+7;
 
vector<long long > a[N];
long long depth[N],parent[N][18],dist[N][18];
long long n,x,w,y;
void dfs(long long i,long long p)
{
    for(int j=0;j<a[i].size();j++)
        if(a[i][j]!=p)
        {
            parent[a[i][j]][0]=i;
            depth[a[i][j]]=depth[i]+1;
            dist[a[i][j]][0]=a[i][j].second;
            dfs(a[i][j],i);
        }
}
int main()
{
    cin>>n;
    for(int i=0;i<n-1;i++)
    {
        cin>>x>>y;
        a[x].push_back(y);
        a[y].push_back(x);
    }
    memset(parent,-1,sizeof(parent));
    memset(dist,-1,sizeof(dist));
    dfs(1,0);
    for(int j=0;j<=17;j++)
        parent[1][j]=-1;
 
    for(int j=1;j<18;j++)
        for(int i=2;i<=n;i++)
            {
                parent[i][j]=parent[parent[i][j-1]][j-1];
                if(parent[i][j]>=1)
                dist[i][j]=dist[parent[i][j-1]][j-1]+dist[i][j-1];
            }
for(int i=1;i<=n;i++)
	cout<<parent[i][0]<<" "<<parent[i][1]<<" "<<parent[i][2]<<endl;
 
 
}
 

prog.cpp: In function ‘void dfs(long long int, long long int)’:
prog.cpp:16:38: error: request for member ‘second’ in ‘a[i].std::vector<_Tp, _Alloc>::operator[]<long long int, std::allocator<long long int> >(((std::vector<long long int>::size_type)j))’, which is of non-class type ‘__gnu_cxx::__alloc_traits<std::allocator<long long int> >::value_type {aka long long int}’
             dist[a[i][j]][0]=a[i][j].second;
                                      ^~~~~~

Standard output is empty