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#include <bits/stdc++.h> #define ios ios::sync_with_stdio(false) , cin.tie(0) , cout.tie(0) #define ll long long using namespace std; const int maxn = 1e4 +7; int b[maxn]; int main(){ ios; int a , d; map <int , int> mp; cin >> a ; for(int i = 1 ; i <= a ; i++){ cin >> d; for(int j = 1 ; j <= d ; j++){ cin >> b[j]; mp[b[j]] = j; } int ans = 0 ; for(int k = 1 ; k <= d ; k++ ){ if((b[k] != mp[b[k]])) ans = __gcd(ans , abs(mp[b[k]] - b[k])); } cout << ans << '\n'; mp.clear(); } return 0; }
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