public static ArrayList < Integer > getPrimes ( int n ) {
  ArrayList < Integer > primes = new ArrayList < > ( ) ;
  boolean first = true ;
  while ( n % 2 == 0 ) {
    n /= 2 ;
    if ( first ) {
      primes . add ( 2 ) ;
      first = false ;
    }
  }
  for ( int i = 3 ;
  i <= Math . sqrt ( n ) ;
  i ++ ) {
    first = true ;
    while ( n % i == 0 ) {
      n /= i ;
      if ( first ) {
        primes . add ( i ) ;
        first = false ;
      }
    }
  }
  if ( n > 1 ) primes . add ( n ) ;
  return primes ;
}

public static ArrayList < Integer > getPrimes ( int n ) { ArrayList < Integer > primes = new ArrayList < > ( ) ; boolean first = true ; while ( n % 2 == 0 ) { n /= 2 ; if ( first ) { primes . add ( 2 ) ; first = false ; } } for ( int i = 3 ; i <= Math . sqrt ( n ) ; i ++ ) { first = true ; while ( n % i == 0 ) { n /= i ; if ( first ) { primes . add ( i ) ; first = false ; } } } if ( n > 1 ) primes . add ( n ) ; return primes ; }
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