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- #include <bits/stdc++.h>
- using namespace std;
- typedef long long int ll;
- int main()
- {
- int t;
- cin>>t;
- while(t--){
- int n;
- cin>>n;
- int a[n];
- ll last[n+1];
- for(int i=0;i<n;i++){
- cin>>a[i];
- }
- for(int i=0;i<=n;i++){
- last[i]=-1000000000;
- }
- ll ans=INT_MAX;
- for(ll i=0;i<n;i++){
- ans=min(ans,i-(last[a[i]]));
- last[a[i]]=i;
- }
- if(ans>n){
- cout<<-1<<"\n";
- }
- else{
- cout<<ans+1<<"\n";
- }
- }
- }
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