This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define int long long
using namespace std;
int const mxN = 3e5+5;
int n;
vector<pair<int,int>> adj [mxN];
signed main() {
ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
cin>>n;
for(int i=0; i<n-1; i++) {
int a,b,c; cin>>a>>b>>c;
adj[a].push_back({b,c}), adj[b].push_back({a,c});
}
cout<<n<<'\n';
for(int i=1; i<=n; i++) cout<<i<<' ';
return 0;
}
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