static boolean check ( int mat [ ] [ ] ) {
  int xorr = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    xorr ^= mat [ i ] [ 0 ] ;
  }
  if ( xorr != 0 ) return true ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    for ( int j = 1 ;
    j < M ;
    j ++ ) {
      if ( mat [ i ] [ j ] != mat [ i ] [ 0 ] ) return true ;
    }
  }
  return false ;
}

static boolean check ( int mat [ ] [ ] ) { int xorr = 0 ; for ( int i = 0 ; i < N ; i ++ ) { xorr ^= mat [ i ] [ 0 ] ; } if ( xorr != 0 ) return true ; for ( int i = 0 ; i < N ; i ++ ) { for ( int j = 1 ; j < M ; j ++ ) { if ( mat [ i ] [ j ] != mat [ i ] [ 0 ] ) return true ; } } return false ; }
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