42 lines
905 B
C++
42 lines
905 B
C++
#include<bits/stdc++.h>
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using namespace std;
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#ifdef ONLINE_JUDGE
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#define dbg(...)
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#else
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#include "debug.h"
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#endif
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#define ll long long
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#define endl '\n'
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#define all(x) x.begin(), x.end()
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#define sz(x) (int)(x).size()
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#define yes cout<<"YES"<<endl
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#define no cout<<"NO"<<endl
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#define FAST (ios_base:: sync_with_stdio(false),cin.tie(NULL));
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ll pow(ll x,ll y,ll m=1e9+7){ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
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void solve()
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{
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int n;
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cin>>n;
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vector<int>v(n);
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for(auto &i:v) cin>>i;
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for(int i=0; i<n; ++i)
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{
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int fnd=i+1;
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int bst=v[i];
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if(v[bst-1]==fnd)
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{
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cout<<2<<endl;
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return;
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}
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}
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cout<<3<<endl;
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}
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signed main()
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{
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FAST;
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int TC = 1;
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cin >> TC;
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while (TC--) solve();
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} |