static int FirstDigit ( int arr [ ] , int n ) {
  double S = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) S = S + Math . log10 ( arr [ i ] * 1.0 ) ;
  double fract_S = S - Math . floor ( S ) ;
  int ans = ( int ) Math . pow ( 10 , fract_S ) ;
  return ans ;
}

static int FirstDigit ( int arr [ ] , int n ) { double S = 0 ; for ( int i = 0 ; i < n ; i ++ ) S = S + Math . log10 ( arr [ i ] * 1.0 ) ; double fract_S = S - Math . floor ( S ) ; int ans = ( int ) Math . pow ( 10 , fract_S ) ; return ans ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_floating_point_literal)))))))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier)))))) (return_statement (identifier))))