give integer array num integer k return number good subarray numsA good array array number different integer array exactly kFor example 12312 3 different integer 1 2 3A subarray contiguous array Example 1input num 12123 k 2output 7Explanation Subarrays form exactly 2 different integer 12 21 12 23 121 212 1212example 2input num 12134 k 3output 3explanation Subarrays form exactly 3 different integer 1213 213 134 Constraints1 numslength 2 1041 numsi k numslength