static boolean isSym ( int [ ] [ ] mt , int len ) {
  int up = len / 2 - 1 ;
  int down = len / 2 ;
  int m = mt [ 0 ] . length ;
  while ( up >= 0 ) {
    for ( int i = 0 ;
    i < m ;
    i ++ ) {
      if ( mt [ up ] [ i ] != mt [ down ] [ i ] ) {
        return false ;
      }
    }
    up -- ;
    down ++ ;
  }
  return true ;
}

static boolean isSym ( int [ ] [ ] mt , int len ) { int up = len / 2 - 1 ; int down = len / 2 ; int m = mt [ 0 ] . length ; while ( up >= 0 ) { for ( int i = 0 ; i < m ; i ++ ) { if ( mt [ up ] [ i ] != mt [ down ] [ i ] ) { return false ; } } up -- ; down ++ ; } return true ; }
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