public static int nCr ( int n , int r ) {
  int res = 1 ;
  for ( int i = 1 ;
  i <= r ;
  i ++ ) {
    res *= ( n - r + i ) ;
    res /= i ;
  }
  return res ;
}

public static int nCr ( int n , int r ) { int res = 1 ; for ( int i = 1 ; i <= r ; i ++ ) { res *= ( n - r + i ) ; res /= i ; } return res ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (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: (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: (block (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (identifier))))) (return_statement (identifier))))