B"Let's call an array t dominated by value v in the next situation. At first, array t should have at least 2 elements. Now, let's calculate number of occurrences of each number num in t and define it as occ(num) . Then t is dominated (by v ) if (and only if) occ(v) > occ(v') for any other number v' . For example, arrays [1, 2, 3, 4, 5, 2] , [11, 11] and [3, 2, 3, 2, 3] are dominated (by 2 , 11 and 3 respectevitely) but arrays [3] , [1, 2] and [3, 3, 2, 2, 1] are not. Small remark: since any array can be dominated only by one number, we can not specify this number and just say that array is either dominated or not. You are given array a_1, a_2, ... , a_n . Calculate its shortest dominated subarray or say that there are no such subarrays. The subarray of a is a contiguous part of the array a , i. xe2 x80 x89e. the array a_i, a_{i + 1}, ... , a_j for some 1 <= i <= j <= n . The first line contains single integer T ( 1 <= T <= 1000 ) -- the number of test cases. Each test case consists of two lines. The first line contains single integer n ( 1 <= n <= 2 cdot 10^5 ) -- the length of the array a . The second line contains n integers a_1, a_2, ... , a_n ( 1 <= a_i <= n ) -- the corresponding values of the array a . It's guaranteed that the total length of all arrays in one test doesn't exceed 2 cdot 10^5 . Print T integers -- one per test case. For each test case print the only integer -- the length of the shortest dominated subarray, or -1 if there are no such subarrays. In the first test case, there are no subarrays of length at least 2 , so the answer is -1 . In the second test case, the whole array is dominated (by 1 ) and it's the only dominated subarray. In the third test case, the subarray a_4, a_5, a_6 is the shortest dominate"...