CodeForces-1257C.cpp

//
// Created by abdob on 10/23/2022.
//
#include<bits/stdc++.h>
using namespace std;

//{
#define si(a) scanf("%d",&a)
#define sii(a,b) scanf("%d %d",&a,&b);
#define siii(a,b,c) scanf("%d %d %d",&a,&b,&c);

#define sl(a) scanf("%lld",&a)
#define sll(a,b) scanf("%lld %lld",&a,&b);
#define slll(a,b,c) scanf("%lld %lld %lld",&a,&b,&c);

#define outi(a) printf("%d\n",a)
#define outii(a,b) printf("%d %d\n",a,b)
#define outis(a) printf(" %d",a)

#define outl(a) printf("%lld\n",a)
#define outll(a,b) printf("%lld %lld\n",a,b)
#define outls(a) printf(" %lld",a)

#define cel(n,k) ((n-1)/k+1)
#define sets(a) memset(a, -1, sizeof(a))
#define clr(a) memset(a, 0, sizeof(a))
#define fr(n) for(int i=0;i<n;i++)
#define fr1(n) for(int i=1;i<=n;i++)
#define frj(n) for(int j=0;j<n;j++)
#define frj1(n) for(int j=1;j<=n;j++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define mp make_pair
#define ff first
#define ss second
#define INF 10000007
#define fastIO() ios_base::sync_with_stdio(false); cin.tie(NULL);

typedef long long i64;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<long long,long long> pll;
//}

const int N= 2e5+5;

int n, a[N];
vector<int> pos[N];

main(){
    int q;
    si(q);

    while(q--) {
        si(n);
        int mini= 1e7;


        fr(n){
            si(a[i]);
            pos[a[i]].pb(i);
        }

        fr1(n){
            if(pos[i].size()<2)  continue;

            frj1(pos[i].size()-1)  mini= min(mini,pos[i][j]-pos[i][j-1]);
        }

        if(mini==1e7)  puts("-1");
        else  outi(mini+1);

        fr1(n)  pos[i].clear();
    }
}