c - Array in JAVA., repeat? -


i'm writing function using java language takes in 1d array , size of array inputs function. want find out how many function values of in array. how this?

approach 1(o(nlogn)):

  1. sort array.
  2. compare adjacent elements in array
  3. increment count whenever adjacent elements unequal. please take care of 3 consecutive same elements using variable.

approach 2(o(n) space complexity of o(n)):

  1. create hash table value.
  2. insert value if not present in hash table.
  3. count , print values present in hashtable

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