title: Maximum Area Rectangle Picking Four Sides Array 1
signature: maximumAreaRectanglePickingFourSidesArray1 :: [Integer] -> Integer -> Integer
  maximumAreaRectanglePickingFourSidesArray1 arr n = 
test_code: import Text.Printf
  import Control.Exception (catch, SomeException)
  import Data.Typeable
  import qualified Data.List as List
  import qualified Data.Map as Map
  import qualified Data.Set as Set
  
  -- SOLUTION CODE
  -- ============================================
  
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  validateSolution :: Integer -> Integer -> Bool
  validateSolution actual expected = do
      actual == expected
  
  
  driver :: [Integer] -> Integer -> Integer -> String
  driver arr n expected = do
      if (validateSolution (PLACEHOLDER_FN_NAME arr n) expected)
          then "PASSED"
      else "FAILED"
  
  main = do
      printf "TEST-0...%s\n" (driver ([4, 6, 7, 8, 12, 13, 14, 15, 18, 18, 19, 19, 26, 26, 32, 32, 33, 34, 34, 36, 41, 43, 47, 47, 51, 51, 52, 53, 55, 56, 57, 60, 61, 71, 74, 75, 76, 77, 79, 87, 87, 87, 90, 95, 98, 99]) (37) (2397) )
  
      printf "TEST-1...%s\n" (driver ([-64, -72, 6, -62, 54, 14, 28, 60, -96, 14, -32, -2, 80, 8, -56, 68, 86, 64, 86, -12, 82]) (12) (0) )
  
      printf "TEST-2...%s\n" (driver ([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, 1, 1, 1]) (27) (1) )
  
      printf "TEST-3...%s\n" (driver ([99, 7, 14, 50, 94, 24, 79, 13, 19, 29, 22, 2, 77, 36, 38, 18, 51, 15, 99, 52, 17, 77, 22, 54]) (15) (0) )
  
      printf "TEST-4...%s\n" (driver ([-96, -92, -86, -84, -84, -80, -70, -70, -68, -64, -64, -48, -46, -24, -22, -20, -8, -8, 0, 0, 4, 8, 8, 22, 28, 36, 46, 50, 52, 54, 60, 62, 66, 70, 80, 84, 86, 94, 96, 96]) (25) (0) )
  
      printf "TEST-5...%s\n" (driver ([1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1]) (12) (1) )
  
      printf "TEST-6...%s\n" (driver ([98]) (0) (0) )
  
      printf "TEST-7...%s\n" (driver ([-88, -24, 8, 20, -46, 60, 24, 26, 98, 82, -30, 16, 22, -28, 84, 12, 34, 14, -18, -38, -94, -24, 6, 4, -52, -48, 84]) (21) (0) )
  
      printf "TEST-8...%s\n" (driver ([0, 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, 1, 1, 1, 1, 1, 1]) (21) (0) )
  
      printf "TEST-9...%s\n" (driver ([6, 30, 47, 97, 20, 16, 68, 34, 1, 77, 48, 8, 22, 68]) (8) (0) )
  
source_py: def maximum_area_rectangle_picking_four_sides_array_1(arr, n):
      s = []
      first = 0
      second = 0
      for i in range(n):
          if (arr[i] not in s):
              s.append(arr[i])
              continue
          if (arr[i] > first):
              second = first
              first = arr[i]
          elif (arr[i] > second):
              second = arr[i]
      return (first * second)
source_cpp: int maximum_area_rectangle_picking_four_sides_array_1(vector<int> arr, int n) {
    unordered_set < int > s;
    int first = 0, second = 0;
    for ( int i = 0;
    i < n;
    i ++ ) {
      if ( s . find ( arr [ i ] ) == s . end ( ) ) {
        s . insert ( arr [ i ] );
        continue;
      }
      if ( arr [ i ] > first ) {
        second = first;
        first = arr [ i ];
      }
      else if ( arr [ i ] > second ) second = arr [ i ];
    }
    return ( first * second );
  }