static int count ( int arr [ ] , int n , int k ) {
  Arrays . sort ( arr ) ;
  int cnt = 0 ;
  int i = 0 , j = 1 ;
  while ( i < n && j < n ) {
    j = ( j <= i ) ? ( i + 1 ) : j ;
    while ( j < n && ( arr [ j ] - arr [ i ] ) < k ) j ++ ;
    cnt += ( n - j ) ;
    i ++ ;
  }
  return cnt ;
}

static int count ( int arr [ ] , int n , int k ) { Arrays . sort ( arr ) ; int cnt = 0 ; int i = 0 , j = 1 ; while ( i < n && j < n ) { j = ( j <= i ) ? ( i + 1 ) : j ; while ( j < n && ( arr [ j ] - arr [ i ] ) < k ) j ++ ; cnt += ( n - j ) ; i ++ ; } return cnt ; }
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