static void replacematrix ( int [ ] [ ] mat , int n , int m ) {
  int [ ] rgcd = new int [ R ] ;
  int [ ] cgcd = new int [ C ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < m ;
    j ++ ) {
      rgcd [ i ] = gcd ( rgcd [ i ] , mat [ i ] [ j ] ) ;
      cgcd [ j ] = gcd ( cgcd [ j ] , mat [ i ] [ j ] ) ;
    }
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) for ( int j = 0 ;
  j < m ;
  j ++ ) mat [ i ] [ j ] = Math . max ( rgcd [ i ] , cgcd [ j ] ) ;
}

static void replacematrix ( int [ ] [ ] mat , int n , int m ) { int [ ] rgcd = new int [ R ] ; int [ ] cgcd = new int [ C ] ; for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < m ; j ++ ) { rgcd [ i ] = gcd ( rgcd [ i ] , mat [ i ] [ j ] ) ; cgcd [ j ] = gcd ( cgcd [ j ] , mat [ i ] [ j ] ) ; } } for ( int i = 0 ; i < n ; i ++ ) for ( int j = 0 ; j < m ; j ++ ) mat [ i ] [ j ] = Math . max ( rgcd [ i ] , cgcd [ j ] ) ; }
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