title: Number Visible Boxes Putting One Inside Another
signature: function numberVisibleBoxesPuttingOneInsideAnother(arr: Array<number>, n: number): number {
test_code: 
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  function convertToString(value: any): string{
      return JSON.stringify(value, function (key, val) {
          if (val instanceof Set) {
              return Array.from(val);
          } return val;});
  }
  
  function validateSolution(actual: number, expected: number): boolean {
      return convertToString(actual) === convertToString(expected);
  }
  
  function driver(arr: Array<number>, n: number, expected:number): string {
      try{
          if (validateSolution(PLACEHOLDER_FN_NAME(arr, n),expected)){
              return "PASSED";
          }
          return "FAILED";
      } catch (error) {
        return error.name;
      }
      
  }
      
  function main(){
    let result = '';
    result = driver([2, 3, 17, 17, 18, 28, 28, 29, 34, 43, 44, 52, 54, 80, 84, 84, 91, 92, 97], 12, 7);
    console.log(`TEST-0...${result}`);
  
    result = driver([-94, -90, -90, -78, -34, -26, -10, 4, 24, 28, 64, 70, 72, 74, 80, 82], 10, 2);
    console.log(`TEST-1...${result}`);
  
    result = driver([0, 0, 0, 0, 0, 0, 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], 40, 15);
    console.log(`TEST-2...${result}`);
  
    result = driver([2, 3, 5, 8, 12, 16, 20, 30, 37, 53, 55, 62, 76, 81, 83, 87, 88, 96], 9, 3);
    console.log(`TEST-3...${result}`);
  
    result = driver([-94, -92, -60, -58, -54, -42, -36, -12, -8, -2, 8, 14, 18, 20, 26, 32, 38, 56, 58, 60, 70, 78, 80, 86, 98], 18, 4);
    console.log(`TEST-4...${result}`);
  
    result = driver([0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1], 9, 4);
    console.log(`TEST-5...${result}`);
  
    result = driver([1, 1, 2, 3, 3, 11, 16, 18, 19, 21, 21, 22, 22, 24, 27, 28, 29, 43, 43, 52, 55, 57, 60, 62, 62, 63, 65, 66, 70, 70, 73, 77, 78, 79, 79, 80, 85, 85, 86, 88, 89, 90, 97, 98], 30, 13);
    console.log(`TEST-6...${result}`);
  
    result = driver([-94, -82, -80, -78, -68, -60, -58, -44, -44, -42, -30, -30, -22, -18, -18, -14, -14, -10, -8, -6, 4, 4, 6, 12, 12, 14, 18, 30, 44, 48, 50, 52, 54, 80, 86, 88, 88], 21, 1);
    console.log(`TEST-7...${result}`);
  
    result = driver([0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1], 7, 3);
    console.log(`TEST-8...${result}`);
  
    result = driver([3, 5, 5, 10, 12, 16, 22, 31, 31, 32, 39, 43, 43, 47, 49, 50, 51, 52, 52, 56, 59, 59, 62, 69, 69, 71, 75, 81, 82, 83, 83, 86, 89, 90, 90, 96], 28, 17);
    console.log(`TEST-9...${result}`);
  
  };
  
  main();
source_py: def number_visible_boxes_putting_one_inside_another(arr, n):
      q = collections.deque([])
      arr.sort()
      q.append(arr[0])
      for i in range(1, n):
          now = q[0]
          if (arr[i] >= (2 * now)):
              q.popleft()
          q.append(arr[i])
      return len(q)
source_cpp: int number_visible_boxes_putting_one_inside_another(vector<int> arr, int n) {
    queue < int > q;
    sort(arr.begin(), arr.end());
    q . push ( arr [ 0 ] );
    for ( int i = 1;
    i < n;
    i ++ ) {
      int now = q . front ( );
      if ( arr [ i ] >= 2 * now ) q . pop ( );
      q . push ( arr [ i ] );
    }
    return q . size ( );
  }