title: Count Index Pairs Equal Elements Array
signature: func countIndexPairsEqualElementsArray(arr []int, n int) int {
test_code: package main
  
  import (
      "fmt"
      "reflect"
      "math"
      "sort"
  )
  
  // SOLUTION CODE
  // ===================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE
  // ===================================
  func validateSolution(actual int, expected int) bool {
      return reflect.DeepEqual(actual,expected)
  }
  
  func driver(arr []int, n int, expected int) string {
      if validateSolution(PLACEHOLDER_FN_NAME(arr, n),expected) {
              return "PASSED"
      }
      return "FAILED"
  
  }
  
  func main() {
  
      // Use imports to avoid undefined errors
      var _ = reflect.DeepEqual
      _ = math.Abs
      _ = sort.Sort
      result := ""
      result = driver([]int{4, 6, 9, 16, 16, 21, 36, 41, 58, 60, 62, 73, 77, 81, 95}, 
  	12, 1)
      fmt.Printf("TEST-0...%s\n", result)
      
      result = driver([]int{-86, -72, -26, -34, 18, -62, -66}, 
  	3, 0)
      fmt.Printf("TEST-1...%s\n", result)
      
      result = driver([]int{1}, 
  	0, 0)
      fmt.Printf("TEST-2...%s\n", result)
      
      result = driver([]int{16}, 
  	0, 0)
      fmt.Printf("TEST-3...%s\n", result)
      
      result = driver([]int{-88, -80, -72, -68, -64, -26, 4, 14, 16, 22, 30, 32, 60, 74, 82}, 
  	11, 0)
      fmt.Printf("TEST-4...%s\n", result)
      
      result = driver([]int{0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1}, 
  	9, 16)
      fmt.Printf("TEST-5...%s\n", result)
      
      result = driver([]int{3, 9, 10, 12, 17, 23, 27, 29, 42, 44, 59, 61, 71, 76, 78, 82, 84, 84, 89, 90, 93, 93, 97, 97}, 
  	15, 0)
      fmt.Printf("TEST-6...%s\n", result)
      
      result = driver([]int{68, -40, -46, -20, -64, 90}, 
  	5, 0)
      fmt.Printf("TEST-7...%s\n", result)
      
      result = driver([]int{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 
  	15, 61)
      fmt.Printf("TEST-8...%s\n", result)
      
      result = driver([]int{99, 17, 94, 43, 97, 17, 11, 58, 75, 94, 37, 22, 54, 31, 41, 4, 55, 69, 92, 80, 45, 97, 16, 33, 36, 17, 43, 82, 81, 64, 22, 65, 85, 44, 47, 14}, 
  	23, 3)
      fmt.Printf("TEST-9...%s\n", result)
      
          
  }
source_py: def count_index_pairs_equal_elements_array(arr, n):
      ans = 0
      for i in range(0, n):
          for j in range((i + 1), n):
              if (arr[i] == arr[j]):
                  ans += 1
      return ans
source_cpp: int count_index_pairs_equal_elements_array(vector<int> arr, int n) {
    int ans = 0;
    for ( int i = 0;
    i < n;
    i ++ ) for ( int j = i + 1;
    j < n;
    j ++ ) if ( arr [ i ] == arr [ j ] ) ans ++;
    return ans;
  }