title: K Th Distinct Or Non Repeating Element In An Array
signature: pub fn k_th_distinct_or_non_repeating_element_in_an_array(arr: Vec<i32>, n: i32, k: i32) -> i32 {
test_code: use std::collections::HashMap;
  use std::collections::HashSet;
  use std::cmp::*;
  use std::collections::*;
  use std::fmt::*; 
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  pub fn validate_solution(actual: i32, expected: i32)->bool{
  return actual==expected
  }
  pub fn driver(arr: Vec<i32>, n: i32, k: i32, expected: i32)->String{
      if validate_solution(PLACEHOLDER_FN_NAME(arr, n, k), expected) {
        return "PASSED".to_string();
      };
      return "FAILED".to_string();
  
  }
  
  fn main() {
      println!("TEST-0...{}", driver(
        Vec::from([2, 3, 8, 18, 20, 33, 53, 56, 60, 71, 76, 80, 81, 87, 88, 89, 92, 95]), 16, 16, 
        89
      ));
      
      println!("TEST-1...{}", driver(
        Vec::from([-78, 6, 32, 52, -12, -32, 22, -40, -82, 24, 30, 10, -40]), 8, 6, 
        -32
      ));
      
      println!("TEST-2...{}", driver(
        Vec::from([0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1]), 7, 5, 
        -1
      ));
      
      println!("TEST-3...{}", driver(
        Vec::from([3, 28, 55, 21, 42, 60, 96, 83, 98, 75, 29, 73, 51, 21, 27, 65, 19, 47, 12, 81, 19, 94, 50, 43, 21, 32, 52, 44, 52, 91, 49, 59, 52, 10, 75, 86, 46, 43, 3, 49, 70, 60, 77, 99, 27, 63]), 40, 39, 
        -1
      ));
      
      println!("TEST-4...{}", driver(
        Vec::from([-96, -90, -76, -44, -16, -8, 0, 0, 2, 2, 8, 14, 16, 18, 18, 20, 20, 28, 34, 44, 68, 74, 84, 90]), 23, 12, 
        44
      ));
      
      println!("TEST-5...{}", driver(
        Vec::from([0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0]), 10, 8, 
        -1
      ));
      
      println!("TEST-6...{}", driver(
        Vec::from([3, 4, 5, 8, 9, 15, 26, 26, 26, 35, 39, 40, 42, 43, 45, 45, 48, 52, 54, 56, 57, 67, 74, 77, 79, 80, 81, 86, 87, 92, 95, 97]), 26, 24, 
        -1
      ));
      
      println!("TEST-7...{}", driver(
        Vec::from([-76, -24, -12, 66, -40, 26, 72, 46, -56, 58, -68, 2, -82]), 6, 10, 
        -1
      ));
      
      println!("TEST-8...{}", driver(
        Vec::from([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, 1, 1, 1]), 27, 17, 
        -1
      ));
      
      println!("TEST-9...{}", driver(
        Vec::from([29, 83, 32, 75, 5, 22, 68, 64, 36, 18, 7, 63, 16, 42, 77, 61, 1, 26, 12, 41, 67, 85, 85, 35, 94, 18, 14, 65, 8, 55, 44, 34, 48, 23, 8, 27, 86, 2, 51, 91]), 28, 24, 
        65
      ));
      
  }
source_py: def k_th_distinct_or_non_repeating_element_in_an_array(arr, n, k):
      dist_count = 0
      for i in range(n):
          j = 0
          while (j < n):
              if ((i != j) and (arr[j] == arr[i])):
                  break
              j += 1
          if (j == n):
              dist_count += 1
          if (dist_count == k):
              return arr[i]
      return (- 1)
source_cpp: int k_th_distinct_or_non_repeating_element_in_an_array(vector<int> arr, int n, int k) {
    int dist_count = 0;
    for ( int i = 0;
    i < n;
    i ++ ) {
      int j;
      for ( j = 0;
      j < n;
      j ++ ) if ( i != j && arr [ j ] == arr [ i ] ) break;
      if ( j == n ) dist_count ++;
      if ( dist_count == k ) return arr [ i ];
    }
    return - 1;
  }