title: First Element Occurring K Times Array
signature: function first_element_occurring_k_times_array(arr, n, k)
source_py: def first_element_occurring_k_times_array(arr, n, k):
      count_map = {
          
      }
      for i in range(0, n):
          if (arr[i] in count_map.keys()):
              count_map[arr[i]] += 1
          else:
              count_map[arr[i]] = 1
          i += 1
      for i in range(0, n):
          if (count_map[arr[i]] == k):
              return arr[i]
          i += 1
      return (- 1)
source_cpp: int first_element_occurring_k_times_array(vector<int> arr, int n, int k) {
    unordered_map < int, int > count_map;
    for ( int i = 0;
    i < n;
    i ++ ) count_map [ arr [ i ] ] ++;
    for ( int i = 0;
    i < n;
    i ++ ) if ( count_map [ arr [ i ] ] == k ) return arr [ i ];
    return - 1;
  }
question_info.entry_fn_name: first_element_occurring_k_times_array
question_info.entry_cls_name: Solution
question_info.test_case_ids: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
question_info.test_code: 
  
  -- SOLUTION CODE
  -- ============================================
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  function isCorrect(actual, expected)
      if type(expected) ~= type(actual) then
          return false
      end
      
      if type(expected) == 'table' then
          for k,v_expected in pairs(expected) do
              
              if actual[k] == nil then
                  return false
              end
              local v_actual = actual[k]
              if not isCorrect(v_actual, v_expected) then
                  return false
              end
              actual[k]=nil
          end
      
          if next(actual) then 
              return false
          end
          return true
      else
          return actual == expected
      end
  end
  
  function validateSolution(actual, expected)
      return isCorrect(actual,expected)
  end
  
  function driver(arr, n, k, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(arr, n, k) 
      end)
      if status then
          if validateSolution(exec_result,expected) then
              return "PASSED"
          end
          return "FAILED"
      else
          return string.format("ERROR=%s",string.gsub(error_msg,".*:[%d]+: ",""))
      end
  end
      
  function main()
      result = driver({2, 3, 4, 4, 7, 18, 20, 23, 27, 30, 31, 31, 32, 35, 36, 43, 45, 46, 49, 50, 53, 55, 59, 60, 64, 64, 65, 68, 78, 80, 80, 85, 95}, 30, 2, 4)
      print(string.format("TEST-0...%s",result))
  
      result = driver({-26, 32, 36, 6, 64, 24, -28, 96}, 6, 3, -1)
      print(string.format("TEST-1...%s",result))
  
      result = driver({0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 15, 7, -1)
      print(string.format("TEST-2...%s",result))
  
      result = driver({38, 40, 43, 70, 20, 40, 95, 96, 81, 82}, 9, 1, 38)
      print(string.format("TEST-3...%s",result))
  
      result = driver({-68, -8, -8, 16, 24, 54}, 3, 2, -8)
      print(string.format("TEST-4...%s",result))
  
      result = driver({1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1}, 6, 4, 0)
      print(string.format("TEST-5...%s",result))
  
      result = driver({13, 18, 19, 28, 31, 34, 49, 49, 53, 57, 58, 62, 75, 76, 77, 78, 80, 84, 84, 85, 87, 91, 98, 99}, 20, 2, 49)
      print(string.format("TEST-6...%s",result))
  
      result = driver({-4, 24, -86, -84, 30, -16, 12, -92, -68, 22}, 6, 5, -1)
      print(string.format("TEST-7...%s",result))
  
      result = driver({0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1}, 8, 10, -1)
      print(string.format("TEST-8...%s",result))
  
      result = driver({55, 44, 75, 97, 25, 65, 76, 53, 20, 78, 25, 59, 61, 29, 81, 35, 15, 78, 41, 44, 31, 33, 39, 93, 26, 67}, 23, 20, -1)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
question_info.test_list: [{"idx": 0, "outputs": 4, "inputs": {"arr": [2, 3, 4, 4, 7, 18, 20, 23, 27, 30, 31, 31, 32, 35, 36, 43, 45, 46, 49, 50, 53, 55, 59, 60, 64, 64, 65, 68, 78, 80, 80, 85, 95], "n": 30, "k": 2}}, {"idx": 1, "outputs": -1, "inputs": {"arr": [-26, 32, 36, 6, 64, 24, -28, 96], "n": 6, "k": 3}}, {"idx": 2, "outputs": -1, "inputs": {"arr": [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1], "n": 15, "k": 7}}, {"idx": 3, "outputs": 38, "inputs": {"arr": [38, 40, 43, 70, 20, 40, 95, 96, 81, 82], "n": 9, "k": 1}}, {"idx": 4, "outputs": -8, "inputs": {"arr": [-68, -8, -8, 16, 24, 54], "n": 3, "k": 2}}, {"idx": 5, "outputs": 0, "inputs": {"arr": [1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1], "n": 6, "k": 4}}, {"idx": 6, "outputs": 49, "inputs": {"arr": [13, 18, 19, 28, 31, 34, 49, 49, 53, 57, 58, 62, 75, 76, 77, 78, 80, 84, 84, 85, 87, 91, 98, 99], "n": 20, "k": 2}}, {"idx": 7, "outputs": -1, "inputs": {"arr": [-4, 24, -86, -84, 30, -16, 12, -92, -68, 22], "n": 6, "k": 5}}, {"idx": 8, "outputs": -1, "inputs": {"arr": [0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1], "n": 8, "k": 10}}, {"idx": 9, "outputs": -1, "inputs": {"arr": [55, 44, 75, 97, 25, 65, 76, 53, 20, 78, 25, 59, 61, 29, 81, 35, 15, 78, 41, 44, 31, 33, 39, 93, 26, 67], "n": 23, "k": 20}}]