static int solve ( int arr [ ] , int n , int k ) {
  int minx = INT_MAX ;
  int i ;
  for ( i = 0 ;
  i < n ;
  i ++ ) {
    minx = Math . min ( minx , arr [ i ] ) ;
  }
  int decrements = 0 ;
  for ( i = 0 ;
  i < n ;
  i ++ ) {
    if ( ( arr [ i ] - minx ) % k != 0 ) {
      return - 1 ;
    }
    else {
      decrements += ( ( arr [ i ] - minx ) / k ) ;
    }
  }
  return decrements ;
}

static int solve ( int arr [ ] , int n , int k ) { int minx = INT_MAX ; int i ; for ( i = 0 ; i < n ; i ++ ) { minx = Math . min ( minx , arr [ i ] ) ; } int decrements = 0 ; for ( i = 0 ; i < n ; i ++ ) { if ( ( arr [ i ] - minx ) % k != 0 ) { return - 1 ; } else { decrements += ( ( arr [ i ] - minx ) / k ) ; } } return decrements ; }
(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)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (identifier))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (array_access array: (identifier) index: (identifier)))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))) right: (identifier)) right: (decimal_integer_literal))) consequence: (block (return_statement (unary_expression operand: (decimal_integer_literal)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))) right: (identifier))))))))) (return_statement (identifier))))