static int findMinimumElements ( int [ ] a , int n ) {
  int [ ] b = new int [ n - 1 ] ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    b [ i - 1 ] = a [ i ] - a [ i - 1 ] ;
  }
  int gcd = b [ 0 ] ;
  for ( int i = 0 ;
  i < n - 1 ;
  i ++ ) {
    gcd = gcdFunc ( gcd , b [ i ] ) ;
  }
  int ans = 0 ;
  for ( int i = 0 ;
  i < n - 1 ;
  i ++ ) {
    ans += ( b [ i ] / gcd ) - 1 ;
  }
  return ans ;
}

static int findMinimumElements ( int [ ] a , int n ) { int [ ] b = new int [ n - 1 ] ; for ( int i = 1 ; i < n ; i ++ ) { b [ i - 1 ] = a [ i ] - a [ i - 1 ] ; } int gcd = b [ 0 ] ; for ( int i = 0 ; i < n - 1 ; i ++ ) { gcd = gcdFunc ( gcd , b [ i ] ) ; } int ans = 0 ; for ( int i = 0 ; i < n - 1 ; i ++ ) { ans += ( b [ i ] / gcd ) - 1 ; } return ans ; }
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