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;
using pii = pair<int, int>;
void solve()
{
int n;
cin >> n;
vector<int> v(n);
for (int &i : v)
cin >> i;
for (int i = 1, a, b; i < n; ++i)
cin >> a >> b;
if (v[0] == n || v.back() == n)
cout << "2\n";
else
cout << "3\n";
}
/*
*/
signed main()
{
ios::sync_with_stdio(0);
cin.tie(0);
solve();
return 0;
}
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