static void sortPerfectSquare ( int arr [ ] , int n ) {
  int a ;
  float b ;
  Vector < Integer > v1 = new Vector < Integer > ( ) ;
  Vector < Integer > v2 = new Vector < Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    b = ( float ) Math . sqrt ( arr [ i ] ) ;
    a = ( int ) b ;
    if ( a == b ) {
      v1 . add ( i ) ;
      v2 . add ( arr [ i ] ) ;
    }
  }
  Collections . sort ( v2 ) ;
  int j = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( v1 . get ( j ) == i ) {
      arr [ i ] = v2 . get ( j ) ;
      j ++ ;
    }
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) System . out . print ( arr [ i ] + " " ) ;
}

static void sortPerfectSquare ( int arr [ ] , int n ) { int a ; float b ; Vector < Integer > v1 = new Vector < Integer > ( ) ; Vector < Integer > v2 = new Vector < Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { b = ( float ) Math . sqrt ( arr [ i ] ) ; a = ( int ) b ; if ( a == b ) { v1 . add ( i ) ; v2 . add ( arr [ i ] ) ; } } Collections . sort ( v2 ) ; int j = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( v1 . get ( j ) == i ) { arr [ i ] = v2 . get ( j ) ; j ++ ; } } for ( int i = 0 ; i < n ; i ++ ) System . out . print ( arr [ i ] + " ▁ " ) ; }
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