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>
using namespace std;
int main() {
vector<vector<int> > adj;
int n;
cin >> n;
adj.resize(n);
for (int i = 0; i < n - 1; i++) {
int u, v;
cin >> u >> v;
u--, v--;
adj[u].push_back(v), adj[v].push_back(u);
}
vector<int> val(n);
int myMin = INT_MAX;
for (int i = 0; i < n; i++) {
cin >> val[i];
myMin = min(myMin, val[i]);
}
if (myMin >= 2) {
cout << myMin << "/" << 1;
return 0;
}
}
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