static Vector < Integer > find_idx ( int ar [ ] , int n ) {
  Vector < Integer > answer = new Vector < Integer > ( ) ;
  int sum = ar [ 0 ] ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    if ( sum == ar [ i ] ) {
      answer . add ( i + 1 ) ;
    }
    sum += ar [ i ] ;
  }
  return answer ;
}

static Vector < Integer > find_idx ( int ar [ ] , int n ) { Vector < Integer > answer = new Vector < Integer > ( ) ; int sum = ar [ 0 ] ; for ( int i = 1 ; i < n ; i ++ ) { if ( sum == ar [ i ] ) { answer . add ( i + 1 ) ; } sum += ar [ i ] ; } return answer ; }
(method_declaration (modifiers) type: (generic_type (type_identifier) (type_arguments (type_identifier))) 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: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier))) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (array_access array: (identifier) index: (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 (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))))) (return_statement (identifier))))