public static int reverse ( int time ) {
  int reversed = 0 ;
  for ( int i = 0 ;
  i < 2 ;
  i ++ ) {
    int dig = time % 10 ;
    if ( valid [ dig ] == - 1 ) {
      return - 1 ;
    }
    reversed = reversed * 10 + valid [ dig ] ;
    time /= 10 ;
  }
  return reversed ;
}

public static int reverse ( int time ) { int reversed = 0 ; for ( int i = 0 ; i < 2 ; i ++ ) { int dig = time % 10 ; if ( valid [ dig ] == - 1 ) { return - 1 ; } reversed = reversed * 10 + valid [ dig ] ; time /= 10 ; } return reversed ; }
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