static boolean checkconv ( int a [ ] , int b [ ] , int n ) {
  int [ ] c = new int [ n ] ;
  int flag = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    c [ i ] = b [ i ] - a [ i ] ;
  }
  Vector < pair > idxs = new Vector < pair > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( c [ i ] != 0 ) idxs . add ( new pair ( i , c [ i ] ) ) ;
  }
  for ( int i = 0 ;
  i < idxs . size ( ) - 1 ;
  i ++ ) {
    if ( idxs . get ( i + 1 ) . first - idxs . get ( i ) . first != 1 || idxs . get ( i + 1 ) . second != idxs . get ( i ) . second ) {
      flag = 1 ;
      break ;
    }
  }
  return flag == 1 ? false : true ;
}

static boolean checkconv ( int a [ ] , int b [ ] , int n ) { int [ ] c = new int [ n ] ; int flag = 0 ; for ( int i = 0 ; i < n ; i ++ ) { c [ i ] = b [ i ] - a [ i ] ; } Vector < pair > idxs = new Vector < pair > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( c [ i ] != 0 ) idxs . add ( new pair ( i , c [ i ] ) ) ; } for ( int i = 0 ; i < idxs . size ( ) - 1 ; i ++ ) { if ( idxs . get ( i + 1 ) . first - idxs . get ( i ) . first != 1 || idxs . get ( i + 1 ) . second != idxs . get ( i ) . second ) { flag = 1 ; break ; } } return flag == 1 ? false : true ; }
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